-------
References for Section 7.2
1. John Fitzgerald, et al., Inhalable Particulate Source Category Report For
The Metallurgical Coke Industry. TR-83-97-G, Contract No. 68-02-3157, GCA
Corporation, Bedford, MA, July 1986.
2. Air Pollution By Coking Plants, United Nations Report: Economic Commis-
sion for Europe, ST/ECE/Coal/26, 1968.
3. R. W. Fullerton, "Impingement Baffles To Reduce Emissions from Coke
Quenching", Journal of the Air Pollution Control Association, 17;807-809,
December 1967.
4. J. Varga and H. W. Lownie, Jr., Final Technological Report On A Systems
Analysis Study Of The Integrated Iron And Steel Industry, Contract No.
PH-22-68-65, U. S. Environmental Protection Agency, Research Triangle
Park, NC, May 1969.
5. Particulate Emissions Factors Applicable To The Iron And Steel Industry,
EPA-450/4-79-028, U. S. Environmental Protection Agency, Research Triangle
Park, NC, September 1979.
6. Stack Test Report for J & L Steel, Aliquippa Works, Betz Environmental
Engineers, Plymouth Meeting, PA, April 1977.
7. R. W. Bee, et al., Coke Oven Charging Emission Control Test Program,
Volume I, EPA-650/2-74-062-1, U. S. Environmental Protection Agency,
Washington, DC, July 1974.
8. Emission Testing And Evaluation Of Ford/Koppers Coke Pushing Control
System, EPA-600/2-77-187b, U. S. Environmental Protection Agency,
Washington, DC, September 1977.
9. Stack Test Report, Bethlehem Steel, Burns Harbor, IN, Bethlehem Steel,
Bethlehem, PA, September 1974.
10. Stack Test Report for Inland Steel Corporation, East Chicago, IN Works,
Betz Environmental Engineers, Pittsburgh, PA, June 1976.
11. Stack Test Report for Great Lakes Carbon Corporation, St. Louis, MO,
Clayton Environmental Services, Southfield, MO, April 1975.
12. Source Testing Of A Stationary Coke Side Enclosure, Bethlehem Steel,
Burns Harbor Plant, EPA-340/1-76-012, U. S. Environmental Protection
Agency, Washington, DC, May 1977.
13. Stack Test Report for Allied Chemical Corporation, Ashland, KY, York
Research Corporation, Stamford, CT, April 1979.
14. Stack Test Report, Republic Steel Company, Cleveland, OH, Republic Steel,
Cleveland, OH, November 1979.
10/86 Metallurgical Industry 7.2-21
-------
15. J. Jeffrey, Wet Coke Quench Tower Emission Factor Development, Dofasco,
Ltd., EPA-600/X-85-34CI, U. S. Environmental Protection Agency, Research
Triangle Park, NC, August 1982.
16. Stack Test Report for Shenango Steel, Inc., Neville Island, PA, Betz
Environmental Engineers, Plymouth Meeting, PA, July 1976.
17. Stack Test Report for J & L Steel Corporation, Pittsburgh, PA, Mostardi-
Platt Associates, Bensenville, IL, June 1980.
18. Stack Test Report for J & L Steel Corporation, Pittsburgh, PA, Wheelabrator
Frye, Inc., Pittsburgh, PA, April 1980.
19. R. B. Jacko, et al., By-product Coke Oven Pushing Operation; Total And
Trace Metal Particulate Emissions, Purdue University, West Lafayette, IN,
June 27, 1976.
20. Control Techniques For Lead Air Emissions, EPA-450/2-77-012, U. S. Envi-
ronmental protection Agency, Research Triangle Park, NC, December 1977.
7.2-22 EMISSION FACTORS 10/86
-------
7.3 PRIMARY COPPER SMELTING
7.3.1 Process Description^^
In the United States, copper is produced from sulfide ore concentrates,
principally by pyrometallurgical smelting methods. Because the ores usually
contain less than 1 percent copper, they must be concentrated before transport
to smelters. Concentrations of 15 to 35 percent copper are accomplished at the
mine site by crushing, grinding and flotation. Sulfur content of the concen-
trate ranges from 25 to 35, percent and most of the remainder is iron (25
percent) and water (10 percent). Some concentrates also contain significant
quantities of arsenic, cadmium, lead, antimony, and other heavy metals.
A conventional pyrometallurgical copper smelting process is illustrated
in Figure 7.3-1. The process includes roasting of ore concentrates to produce
calcine, smelting of roasted (calcine feed) or unroasted (green feed) ore
concentrates to produce matte, and converting of the matte to yield blister
copper product (about 99 percent pure). Typically, the blister copper is fire
refined in an anode furnace, cast into "anodes" and sent to an electrolytic
refinery for further impurity elimination.
In roasting, charge material of copper concentrate mixed with a siliceous
flux (often a low grade ore) is heated in air to about 650°C (1200°F), eliminat-
ing 20 to 50 percent of the sulfur as sulfur dioxide (862). Portions of such
impurities as antimony, arsenic and lead are driven off, and some iron is con-
verted to oxide. The roasted product, calcine, serves as a dried and heated
charge for the smelting furnace. Either multiple hearth or fluidized bed roast-
ers are used for roasting copper concentrate. Multiple hearth roasters accept
moist concentrate, whereas fluid bed roasters are fed finely ground material
(60 percent minus 200 mesh). With both of these types, the roasting is autog-
enous. Because there is less air dilution, higher S02 concentrations are
present in fluidized bed roaster gases than in multiple hearth roaster gases.
In the smelting process, either hot calcines from the roaster or raw
unroasted concentrate is melted with siliceous flux in a smelting furnace to
produce copper matte, a molten mixture of cuprous sulfide (Cu2S), ferrous
sulfide (FeS) and some heavy metals. The required heat comes from partial
oxidation of the sulfide charge and from burning external fuel. Most of the
iron and some of the impurities in the charge oxidize with the fluxes to form
atop the molten bath a slag, which is periodically removed and discarded.
Copper matte remains in the furnace until tapped. Mattes produced by the
domestic industry range from 35 to 65 percent copper, with 45 percent the most
common. The copper content percentage is referred to as the matte grade.
Currently, five smelting furnace technologies are used in the U. S., reverber-
atory, electric, Noranda, Outokumpu (flash), and Inco (flash).
Reverberatory furnace operation is a continuous process, with frequent
charging of input materials and periodic tapping of matte and skimming of slag.
10/86 Metallurgical Industry 7.3-1
-------
ORE CONCENTRATES WITH SILICA FLUXES
FUEL.
AIR.
ROASTING
CONVERTER SLAG (2% Cu)
FUEL-
AIR-
-*-OFFGAS
CALCINE
SMELTING
SLAG TO DUMP
(0.5% Cu)
AIR-
OFFGAS
MATTE (~40%Cu)
CONVERTING
GREEN POLES OR GAS-
FUEL"
AIR.
-^-OFFGAS
BLISTER COPPER
W.5+% Cu)
FIRE REFINING
-^•OFFGAS
SLAG TO CONVERTER
T
ANODE COPPER (99.5% Cu)
TO ELECTROLYTIC REFINERY
Figure 7.3-1. Typical primary copper smelter process,
7.3-2
EMISSION FACTORS
10/86
-------
1300 tons) of charge per day. Heat is supplied by combustion of oil, gas or
pulverized coal, and furnace temperature may exceed 1500°C (2730°F).
For smelting in electric arc furnaces, heat is generated by the flow of an
electric current in carbon electrodes lowered through the furnace roof and
submerged in the slag layer of the molten bath. The feed generally consists of
dried concentrates or calcines, and charging wet concentrates is avoided. The
chemical and physical changes occurring in the molten bath are similar to those
occurring in the molten bath of a reverberatory furnace. Also, the matte and
slag tapping practices are similar at both furnaces. Electric furnaces do not
produce fuel combustion gases, so flow rates are lower and S02 concentrations
higher in the effluent gas than in that of reverberatory furnaces.
Flash furnace smelting combines the operations of roasting and smelting to
produce a high grade copper matte from concentrates and flux. In flash smelt-
ing, dried ore concentrates and finely ground fluxes are injected, together with
oxygen, preheated air, or a mixture of both, into a furnace of special design,
where temperature is maintained at approximately 1000° C (1830°F). Flash fur-
naces, in contrast to reverberatory and electric furnaces, use the heat gener-
ated from partial oxidation of their sulfide charge to provide much or all of
the energy (heat) required for smelting. They also produce off gas streams
containing high concentrations of
Slag produced by flash furnace operations contains significantly higher
amounts of copper than does that from reverberatory or electric furnace opera-
tions. As a result, the flash furnace and converter slags are treated in a
slag cleaning furnace to recover the copper. Slag cleaning furnaces usually
are small electric furnaces. The flash furnace and converter slags are charged
to a slag cleaning furnace and are allowed to settle under reducing conditions,
with the addition of coke or iron sulfide. The copper, which is in oxide form
in the slag, is converted to copper sulfide, is subsequently removed from the
furnace and is charged to a converter with regular matte. If the slag's copper
content is low, the slag is discarded.
The Noranda process, as originally designed, allowed the continuous produc-
tion of blister copper in a single vessel by effectively combining roasting,
smelting and converting into one operation. Metallurgical problems, however,
led to the operation of these reactors for the production of copper matte. As
in flash smelting, the Noranda process takes advantage of the heat energy
available from the copper ore. The remaining thermal energy required is sup-
plied by oil burners, or by coal mixed with the ore concentrates.
The final step in the production of blister copper is converting, with the
purposes of eliminating the remaining iron and sulfur present in the matte and
leaving molten "blister" copper. All but one U. S. smelter uses Fierce-Smith
converters, which are refractory lined cylindrical steel shells mounted on
trunnions at either end, and rotated about the major axis for charging and
pouring. An opening in the center of the converter functions as a mouth through
which molten matte, siliceous flux, and scrap copper are charged and gaseous
products are vented. Air or oxygen rich air is blown through the molten matte.
Iron sulfide (FeS) is oxidized to iron oxide (FeO) and S02> and the FeO blowing
and slag skimming are repeated until an adequate amount of relatively pure C^S,
called "white metal", accumulates in the bottom of the converter. A renewed air
blast oxidizes the copper sulfide sulfur to SOo, leaving blister copper in the
10/86 Metallurgical Industry 7.3-3
-------
converter. The blister copper is subsequently removed and transferred to
refining facilities. This segment of converter operation is termed the finish
blow. The S02 produced throughout the operation is vented to pollution control
devices.
One domestic smelter uses Hoboken converters, the primary advantage of
which lies in emission control. The Hoboken converter is essentially like a
conventional Fierce-Smith converter, except that this vessel is fitted with a
side flue at one end shaped as an inverted U. This flue arrangement permits
siphoning of gases from the interior of the converter directly to the offgas
collection system, leaving the converter mouth under a slight vacuum.
Blister copper usually contains from 98.5 to 99.5 percent pure copper.
Impurities may include gold, silver, antimony, arsenic, bismuth, iron, lead,
nickel, selenium, sulfur, tellurium, and zinc. To purify blister copper further,
fire refining and electrolytic refining are used. In fire refining, blister
copper is placed in a fire refining furnace, a flux is usually added, and air
is blown through the molten mixture to oxidize remaining impurities, which are
removed as a slag. The remaining metal bath is subjected to a reducing atmos-
phere to reconvert cuprous oxide to copper. Temperature in the furnace is
around 1100°C (2010°F). The fire refined copper is cast into anodes, after
which, further electrolytic refining separates copper from impurities by elec-
trolysis in a solution containing copper sulfate and sulfuric acid. Metallic
impurities precipitate from the solution and form a sludge that is removed and
treated to recover precious metals. Copper is dissolved from the anode and
deposited at the cathode. Cathode copper is remelted and made into bars,
ingots or slabs for marketing purpose. The copper produced is 99.95 to 99.97
percent pure.
7.3.2 Emissions And Controls
Particulate matter and sulfur dioxide are the principal air contaminants
emitted by primary copper smelters. These emissions are generated directly
from the processes involved, as in the liberation of S(>2 from copper concentrate
during roasting, or in the volatilization of trace elements as oxide fumes.
Fugitive emissions are generated by leaks from major equipment during material
handling operations.
Roasters, smelting furnaces and converters are sources of both particulate
matter acid sulfur oxides. Copper and iron oxides are the primary constituents
of the particulate matter, but other oxides, such as arsenic, antimony, cadmium,
lead, mercury and zinc, may also be present, with metallic sulfates and sulfuric
acid mist. Fuel combustion products also contribute to the particulate emis-
sions from multiple hearth roasters and reverberatory furnaces.
Single stage electrostatic precipitators (ESP) are widely used in the
primary copper industry to control particulate emissions from roasters, smelting
furnaces and converters. Many of the existing ESPs are operated at elevated
temperatures, usually from 200° to 340°C (400° to 650°F) and are termed "hot
ESPs". If properly designed and operated, these ESPs remove 99 percent or more
of the condensed particulate matter present in gaseous effluents. However, at
these elevated temperatures, a significant amount of volatile emissions such as
arsenic trioxide (As2C>3) and sulfuric acid mist is present as vapor in the
gaseous effluent and thus can not be collected by the particulate control
7.3-4 EMISSION FACTORS 10/86
-------
device at elevated temperatures. At these temperatures, the arsenic trioxide
in the vapor state will pass through an ESP. Therefore, the gas stream to be
treated must be cooled sufficiently to assure that most of the arsenic present
is condensed before entering the control device for collection. At some smelt-
ers, the gas effluents are cooled to about 120°C (250°F) temperature before
entering a particulate control system, usually an ordinary ("cold") ESP. Spray
chambers or air infiltration are used for gas cooling. Fabric filters can also
be used for particulate matter collection.
Gas effluents from roasters usually are sent to an ESP or spray chamber/ESP
system or are combined with smelter furnace gas effluents before particulate
collection. Overall, the hot ESPs remove only 20 to 80 percent of the total
particulate (condensed and vapor) present in the gas. Cold ESPs may remove
more than 95 percent of the total particulate present in the gas. Particulate
collection systems for smelting furnaces are similar to those for roasters.
Reverberatory furnace offgases are usually routed through waste heat boilers
and low velocity balloon flues to recover large particles and heat, then are
routed through an ESP or spray chamber/ESP system.
In the standard Fierce-Smith converter, flue gases are captured during the
blowing phase by the primary hood over the converter mouth. To prevent the
hood's binding to the converter with splashing molten metal, there is a gap
between the hood and the vessel. During charging and pouring operations,
significant fugitives may be emitted when the hood is removed to allow crane
access. Converter offgases are treated in ESPs to remove particulate matter
and in sulfuric acid plants to remove S02-
Remaining smelter processes handle material that contains very little
sulfur, hence S02 emissions from these processes are relatively insignificant.
Particulate emissions from fire refining operations, however, may be of concern.
Electrolytic refining does not produce emissions unless the associated sulfuric
acid tanks are open to the atmosphere. Crushing and grinding systems used in
ore, flux and slag processing also contribute to fugitive dust problems.
Control of S02 emissions from smelter sources is most commonly performed
in a single or double contact sulfuric acid plant. Use of a sulfuric acid
plant to treat copper smelter effluent gas streams requires that gas be free
from particulate matter and that a certain minimum SC>2 concentration be main-
tained. Practical limitations have usually restricted sulfuric acid plant
application to gas streams that contain at least 3 percent SC^. Table 7.3-1
shows typical average SC>2 concentrations for the various smelter unit offgases.
Currently, converter gas effluents at most smelters are treated for SC>2 control
in sulfuric acid plants. Gas effluents of some multiple hearth roaster opera-
tions and of all fluid bed roaster operations also are treated in sulfuric acid
plants. The weak SC>2 content gas effluents from reverberatory furnace opera-
tions are usually released to the atmosphere with no reduction of S02« The gas
effluents from the other types of smelter furnaces, because of their higher
contents of S02, are treated in sulfuric acid plants before being vented.
Typically, single contact acid plants achieve 92.5 to 98 percent conversion of
SC>2 to acid, with approximately 2000 parts per million S02 remaining in the acid
plant effluent gas. Double contact acid plants collect from 98 to more than 99
percent of the SC>2 and emit about 500 parts per million S02» Absorption of the
S02 in dimethylaniline (DMA) solution has also been used in U. S. smelters to
produce liquid S02-
10/86 Metallurgical Industry 7.3-5
-------
TABLE 7.3-1. TYPICAL SULFUR DIOXIDE CONCENTRATIONS
IN OFFGASES FROM PRIMARY COPPER
SMELTING SOURCES
Unit
Multiple hearth roaster
Fluidized bed roaster
Reverberatory furnace
Electric arc furnace
Flash smelting furnace
Continuous smelting furnace
Pierce-Smith converter
Hoboken converter
Single contact H2S04 plant
Double contact ^504 plant
S02 concentration
(volume %)
1.5 to 3
10 to 12
0.5 to 1.5
4 to 8
10 to 70
5 to 15
4 to 7
8
2 to 0.26
0.05
0
Emissions from hydrometallurgical smelting plants generally are small in
quantity and are easily controlled. In the Arbiter process, ammonia gas escapes
from the leach reactors, mixer/settlers, thickeners and tanks. For control,
all of these units are covered and are vented to a packed tower scrubber to
recover and recycle the ammonia.
Actual emissions from a particular smelter unit depend upon the configura-
tion of equipment in that smelting plant and its operating parameters. Table
7.3-2 gives the emission factors for various smelter configurations, and Tables
7.3-3 through 7.3-5 and Figures 7.3-2 through 7.3-4 give size specific emission
factors for those copper production processes, where information is available.
7.3.3 Fugitive Emissions
The process sources of particulate matter and S02 emission are also the
potential fugitive sources of these emissions: roasting, smelting, converting,
fire refining and slag cleaning. Table 7.3-6 presents the potential fugitive
emission factors for these sources, while Tables 7.3-7 through 7.3-9 and Figures
7.3-5 through 7.3-7 present cumulative size specific particulate emission
factors for fugitive emissions from reverberatory furnace matte, slag tapping,
converter slag, and copper blow operations. The actual quantities of emissions
from these sources depend on the type and condition of the equipment and on the
smelter operating techniques. Although emissions from many of these sources are
released inside a building, ultimately they are discharged to the atmosphere.
i
7.3-6
EMISSION FACTORS
10/86
-------
TABLE 7.3-2. EMISSION FACTORS FOR PRIMARY COPPER SMELTERSa>b
EMISSION FACTOR RATING: B
Particulate
Sulfur dioxided
Configuration0
References
Reverberatory furnace (RF)
followed by converters (C)
Multiple hearth roaster (MHR)
followed by reverberatory
furnace (RF) and converters (C)
Fluid bed roaster (FBR) followed
by reverberatory furnace (RF)
and converters (C)
Concentrate dryer (CD) followed
by electric furnace (EF) and
converters (C)
Fluid bed roaster (FBR) followed
by electric furnace (EF) and
converters (C)
Concentrate dryer (DC) followed
by flash furnace (FF),
cleaning furnace (SS) and
converters (C)
Concentrate dryer (CD) followed
by Noranda reactors (NR) and
converters (C)
By
unit
RF
C
MHR
RF
C
FBR
RF
C
CD
EF
C
FBR
EF
C
CD
FF
ssf
Ce
CD
NR
C
kg/Mg
25
18
22
25
18
NA
25
18
5
50
18
NA
50
18
5
70
5
NAS
5
NA
NA
Ib/ton
50
36
45
50
36
NA
50
36
10
100
36
NA
100
36
10
140
10
MAS
10
NA
NA
kg/Mg
160
370
140
90
300
180
90
270
0.5
120
410
180
45
300
0.5
410
0.5
120
0.5
NA
NA
Ib/ton
320
740
280
180
600
360
160
540
1
240
820
360
90
600
1
820
1
240
1
NA
NA
4-10,
9,11-15
4-5,16-17
4-9,18-19
8,11-13
20
e
e
21-22
15
8,11-13,15
20
15,23
e
21-22
24
22
22
21-22
aExpressed as units/unit weight of concentrated ore processed by the smelter. Approximately 4
unit weights of concentrate are required to produce 1 unit weight of blister copper. NA - not
available.
^For particulate matter removal, gaseous effluents from roasters, smelting furnaces and
converters usually are treated in hot ESPs at 200 to 340°C (400 to 650°F) or In cold ESPs with
gases cooled to about 120°C (250°F) before ESP. Particulate emissions from copper smelters
contain volatile metallic oxides which remain in vapor form at higher temperatures (120°C or
250°F). Therefore, overall particulate removal in hot ESPs may range 20 to 80% and in cold ESPs
may be 99%. Converter gas effluents and, at some smelters, roaster gas effluents are treated in
single contact acid plants (SCAP) or double contact acid plants (DCAP) for S02 removal. Typical
SCAPs are about 96% efficient, and DCAPs are up to 99.8% efficient in S02 removal. They also
remove over 99% of particulate matter. Noranda and flash furnace offgases are also processed
through acid plants and are subject to the same collection efficiencies as cited for
converters and some roasters.
cln addition to sources indicated, each smelter configuration contains fire refining anode
furnaces after the converters. Anode furnaces emit negligible SOj. No particulate emission
data are available for anode furnaces.
^Factors for all configurations except reverberatory furnace followed by converters have been
developed by normalizing test data for several smelters to represent 30% sulfur content In
concentrated ore.
eBased on the test data for the configuration multiple hearth roaster followed by reverberatory
furnace and converters.
fused to recover copper from furnace slag and converter slag.
gSince converters at flash furnace and Noranda furnace smelters treat high copper content matte,
converter particulate emissions fron flash furnace smelters are expected to be lower
than those from conventional smelters with multiple hearth roasters, reverberatory furnace and
converters.
10/86
Metallurgical Industry
7.3-7
-------
TABLE 7.3-3. PARTICLE SIZE DISTRIBUTION AND SIZE SPECIFIC EMISSION FACTORS
FOR MULTIPLE HEARTH ROASTER AND REVERBERATORY SMELTER OPERATIONS3
EMISSION FACTOR RATING: D
Particle
size** (urn)
15
10
5
2.5
1.25
0.625
Total
aReference 25
Cumulative mass %
< stated size Cumulative emission
Uncontrolled ESP Uncontrolled ESP
factors
controlled0
controlled Kg/Mg Ib/ton Kg/Mg Ib/ton
100 100 47 95 0.
100 99 47 94 0.
100 98 47 93 0.
97 84 46 80 0.
66 76 31 72 0.
25 62 12 59 0.
100 100 47 95 0.
. Expressed as units/unit weight of concentrated ore
47 0.95
47 0.94
46 0.93
40 0.80
36 0.72
29 0.59
47 0.95
processed
by the smelter.
^Expressed as
aerodynamic equivalent diameter.
cNominal particulate removal efficiency is 99%.
50
•J \J
a>
i —
o
o
o
c
3
f 30
Ol
_^
" —
S-
0
S 20
f&
it-
CD
•1 —
-------
TABLE 7.3-4.
PARTICLE SIZE DISTRIBUTION AND SIZE SPECIFIC EMISSION FACTORS
FOR REVERBERATORY SMELTER OPERATIONSA
EMISSION FACTOR RATING: E
Cumulative mass %
< stated size
Cumulative emission factors
Particle Uncontrolled ESP
sizeb (um)
15
10
5
2.5
1.25
0.625
NR
27
23
21
16
9
controlled
83
78
69
56
40
32
Uncontrolled
Kg/Mg
NR
6.8
5.8
5.3
4.0
2.3
Ib/ton
NR
13.6
11.6
10.6
8.0
4.6
ESP controlled0
Kg/Mg
0.21
0.20
0.18
0.14
0.10
0.08
Ib/ton
0.42
0.40
0.36
0.28
0.20
0.16
Total
100
100
25
50
0.25
0.50
aReference 25. Expressed as units/unit weight of concentrated ore processed
by the smelter. NR = not reported because of excessive extrapolation.
^Expressed as aerodynamic equivalent diameter.
°Nominal particulate removal efficiency is 99%.
•-o 4
1_
J_
_L
_L
_L
_L
0.24
0.20
0.16
0.12
0.08
0.04
m tn
u~> ->•
-o o
3
£->
o -n
Z3 Qi
r+ n
T n-
o o
—i -5
ID ""~-
0.625
1.25
10
15
2.5 5
Particle Size (pm)
Figure 7.3-3. Size specific emission factors for
reverberatory smelting.
10/86
Metallurgical Industry
7.3-9
-------
TABLE 7.3-5. PARTICLE SIZE DISTRIBUTION AND SIZE SPECIFIC EMISSION FACTORS
FOR COPPER CONVERTER OPERATIONS3
EMISSION FACTOR RATING: E
Cumulative mass %
< stated size
Cumulative emission factors
Particle Uncontrolled ESP
size"3 (urn) controlled
15
10
5
2.5
1.25
0.625
Total
NR
59
32
12
3
1
100
100
99
72
56
42
30
100
Uncontrolled
Kg/Mg
NR
10.6
5.8
2.2
0.5
0.2
18
Ib/ton
NR
21.2
11.5
4.3
1.1
0.4
36
ESP controlled0
Kg/Mg
0.18
0.17
0.13
0.10
0.08
0.05
0.18
Ib/ton
0.36
0.36
0.26
0.20
0.15
0.11
0.36
aReference 25. Expressed as units/unit weight of concentrated ore processed
by the smelter. NR = not reported because of excessive extrapolation.
^Expressed as aerodynamic equivalent diameter.
cNominal particulate removal efficiency is 99 %.
12.0 _
9.0
Ol
Dl
« 6.0
O •—
+J O
O S-
O
(J
3.0
0.0
I
0.20
0-15
O
o
O
3
3?
rD
o.
0.10
0.05
40
3
tQ
0.625 1.25 2.50 6.0 10.0 15.0
Particle Size (ym)
Figure 7.3-4. Size specific emission factors for copper converting.
7.3-10
EMISSION FACTORS
10/86
-------
Fugitive emissions are generated during the discharge and transfer of
hot calcine from multiple hearth roasters, with negligible amounts possible
from the charging of these roasters. Fluid bed roasting, a closed loop opera-
tion, has negligible fugitive emissions.
Matte tapping and slag skimming operations are sources of fugitive
emissions from smelting furnaces. Fugitive emissions can also result from
charging of a smelting furnace or from leaks, depending upon the furnace type
and condition. A typical single matte tapping operation lasts from 5 to 10
minutes and a single slag skimming operation lasts from 10 to 20 minutes.
Tapping frequencies vary with furnace capacity and type. In an 8 hour shift,
matte is tapped 5 to 20 times, and slag is skimmed 10 to 25 times.
Each of the various stages of converter operation - the charging, blow-
ing, slag skimming, blister pouring, and holding - is a potential source of
fugitive emissions. During blowing, the converter mouth is in stack (i. e., a
close fitting primary hood is over the mouth to capture offgases). Fugitive
emissions escape from the hoods. During charging, skimming and pouring opera-
tions, the converter mouth is out of stack (i. e., the converter mouth is
rolled out of its vertical position, and the primary hood is isolated).
Fugitive emissions are discharged during rollout.
TABLE 7.3-6. FUGITIVE EMISSION FACTORS FOR PRIMARY COPPER SMELTERS3
EMISSION FACTOR RATING: B
Particulate S02
Source of emission
kg/Mg Ib/ton kg/Mg Ib/ton
Roaster calcine discharge
Smelting furnace^
Converter
Converter slag return
Anode furnace
Slag cleaning furnace0
1
0
2
NA
0
4
.3
.2
.2
.25
2.
0.
4.
NA
0.
8
6
4
4
5
0
2
65
0
0
3
.5
.05
.05
1
4
130
0
0
6
.1
.1
References 16,22,25-32. Expressed as mass units/unit weight of
concentrated ore processed by the smelter. Approximately 4 unit weights of
concentrate are required to produce 1 unit weight of copper metal. Factors
for flash furnace smelters and Noranda furnace smelters may be lower than
reported values. NA = not available.
"Includes fugitive emissions from matte tapping and slag skimming operations,
About 50% of fugitive particulate emissions and about 90% of total S02 emis-
sions are from matte tapping operations, with remainder from slag skimming.
cUsed to treat slags from smelting furnaces and converters at the flash
furnace smelter.
10/86 Metallurgical Industry 7.3-11
-------
TABLE 7.3-7. UNCONTROLLED PARTICLE SIZE AND SIZE SPECIFIC EMISSION FACTORS
FOR FUGITIVE EMISSIONS FROM REVERBERATORY FURNACE MATTE TAPPING OPERATIONS3
EMISSION FACTOR RATING: D
Particle size^
(urn)
15
10
5
2.5
1.25
0.625
Total
Cumulative mass %
< stated size
76
74
72
69
67
65
100
Cumulative emission factors
kg/Mg
0.076
0.074
0.072
0.069
0.067
0.065
0.100
Ib/ton
0.152
0.148
0.144
0.138
0.134
0.130
0.200
aReference 25. Expressed as units/unit weight of concentrated ore
processed by the smelter.
^Expressed as aerodynamic equivalent diameter.
T3
QJ
O
O
LO
l/l
0.080
0.075
0.070
0.065
I
I
I
I
0.625 1.25 2.50 6.0 10.0 15.0
Particle size (pm)
Figure 7.3-5. Size specific fugitive emission factors for
reverberatory furnace matte tapping operations.
7.3-12
EMISSION FACTORS
10/86
-------
TABLE 7.3-8. PARTICLE SIZE DISTRIBUTION AND SIZE SPECIFIC EMISSION FACTORS
FOR FUGITIVE EMISSIONS FROM REVERBERATORY FURNACE SLAG TAPPING OPERATIONS3
EMISSION FACTOR RATING: D
Particle size^
(urn)
Cumulative mass %
< stated size
Cumulative emission factors
kg/Mg Ib/ton
15
10
5
2.5
1.25
0.625
Total
33
28
25
22
20
17
100
0.033
0.028
0.025
0.022
0.020
0.017
0.100
0.066
0.056
0.050
0.044
0.040
0.034
0.200
aReference 25. Expressed as units/unit weight of concentrated ore
processed by the smelter.
"Expressed as aerodynamic equivalent diameter.
^ 0.035
O)
o
§ 0.030
l/l
l/l
0.025
0.020
0.015
_L
J L
1.25 2.50 6.0 10.0 15.0
Particle size
Figure 7.3-6
0.625
Size specific fugitive emission factors for
reverberatory furnace slag tapping operations.
10/86
Metallurgical Industry
7.3-13
-------
TABLE 7.3-9. PARTICLE SIZE DISTRIBUTION AND SIZE SPECIFIC EMISSION FACTORS
FOR FUGITIVE EMISSIONS FROM CONVERTER SLAG AND COPPER BLOW OPERATIONS21
EMISSION FACTOR RATING: D
Particle size^
Cumulative mass
Cumulative emission factors
^ U.U1 J \ 0 l_ d U CU O J. £, C
15 98
10 96
5 87
2.5 60
1.25 47
0.625 38
Total 100
kg/Mg
2.2
2.1
1.9
1.3
1.0
0.8
2.2
Ib/ton
4.3
4.2
3.8
2.6
2.1
1.7
4.4
aReference 25. Expressed as units/unit weight of concentrated ore
processed by the smelter.
^Expressed as aerodynamic equivalent diameter.
2.5
2.0
cr>
en
S- O)
3^ 1.5
0 O
03 i-
c: o
o o
1/1
C/l
1.0
0.5
Figure 7.3-7,
I
I
I
I
I
0.625 1.25 2.50 6.0 10.0 15.0
Particle size (/jm)
Size specific fugitive emission factors for
converter slag and copper blow operations.
7.3-14
EMISSION FACTORS
10/86
-------
At times during normal smelting operations, slag or blister copper can not
be transferred immediately from or to the converters. This condition, holding
stage, may occur for several reasons, including insufficient matte in the
smelting furnace, the unavailability of a crane, and others. Under these
conditions, the converter is rolled out of its vertical position and remains in
a holding position and fugitive emissions may result.
7.3.4 Lead Emissions
At primary copper smelters, both process emissions and fugitive particulate
from various pieces of equipment contain oxides of many inorganic elements,
including lead. The lead content of particulate emissions depends upon both
the lead content of the smelter feed and the process offgas temperature. Lead
emissions are effectively removed in particulate control systems operating at
low temperatures, about 120°C (250°F).
Table 7.3-10 presents process and fugitive lead emission factors for
various operations of primary copper smelters.
TABLE 7.3-10. LEAD EMISSION FACTORS FOR PRIMARY COPPER SMELTERS3
EMISSION FACTOR RATING: C
Operation
Roasting
Smelting
Converting
Refining
Emission
kg/Mg
0.075
0.036
0.13
NA
factorb
Ib/ton
0.15
0.072
0.27
NA
aReference 33. Expressed as units/unit weight of concentrated ore
processed by smelter. Approximately four unit weights of concentrate
are required to produce one unit weight of copper metal. Based on
test data for several smelters with 0.1 to 0.4 % lead in feed
throughput. NA = not available.
"For process and fugitive emissions totals.
cBased on test data on multihearth roasters. Includes total of
process emissions and calcine transfer fugutive emissions. The
latter are about 10% of total process and fugitive emissions.
^Based on test data on reverberatory furnaces. Includes total
process emissions and fugitive emissions from matte tapping and
slag skimming operations. Fugitive emissions from matte tapping
and slag skimming operations amount to about 35% and 2%, respectively.
elncludes total of process and fugitive emissions. Fugitives
constitute about 50% of total.
10/86 Metallurgical Industry 7.3-15
-------
Fugitive emissions from primary copper smelters are captured by applying
either local ventilation or general ventilation techniques. Once captured,
emissions may be vented directly to a collection device or be combined with
process offgases before collection. Close fitting exhaust hood capture systems
are used for multiple hearth roasters and hood ventilation systems for smelt
matte tapping and slag skimming operations. For converters, secondary hood
systems or building evacuation systems are used.
References for Section 7.3
1. Background Information for New Source Performance Standards; Primary
Copper, Zinc and Lead Smelters, Volume I, Proposed Standards, EPA-450/2-
74-002a, U. S. Environmental Protection Agency, Research Triangle Park,
NC, October 1974.
2. Arsenic Emissions from Primary Copper Smelters - Background Information
for Proposed Standards, Preliminary Draft, EPA Contract No. 68-02-3060,
Pacific Environmental Services, Durham, NC, February 1981.
3. Background Information Document for Revision of New Source Performance
Standards for Primary Copper Smelters, EPA Contract No. 68-02-3056,
Research Triangle Institute, Research Triangle Park, NC, March 31, 1982.
4. Air Pollution Emission Test; Asarco Copper Smelter, El Paso, TX,
EMB-77-CUS-6, Office Of Air Quality Planning And Standards, U. S. Environ-
mental Protection Agency, Research Triangle Park, NC, June 1977.
5. Written communications from W. F. Cummins, Inc., El Paso, TX, to A. E.
Vervaert, U. S. Environmental Protection Agency, Research Triangle Park,
NC, June 1977.
6. AP-42 Background Files, Office Of Air Quality Planning And Standards,
U. S. Environmental Protection Agency, Research Triangle Park, NC, March
1978.
7. Source Emissions Survey of Kennecott Copper Corporation, Copper Smelter
Converter Stack Inlet and Outlet and Reverberatory Electrostatic Precipi-
tator Inlet and Outlet, Hurley, NM, EA-735-09, Ecology Audits, Inc.,
Dallas, TX, April 1973.
8. Trace Element Study at a Primary Copper Smelter, EPA-600/2-78-065a and
065b, U. S. Environmental Protection Agency, Research Triangle Park, NC,
March 1978.
9. Systems Study for Control of Emissions, Primary Nonferrous Smelting
Industry, Volume II; Appendices A and B, PB 184885, National Technical
Information Service, Springfield, VA, June 1969.
10. Design and Operating Parameters for Emission Control Studies: White Pine
Copper Smelter, EPA-600/2-76-036a, U. S. Environmental Protection Agency,
Washington, DC, February 1976.
7.3-16 EMISSION FACTORS 10/86
-------
11. R. M. Statnick, Measurements of Sulfur Dioxide, Partlculate and Trace
Elements in Copper Smelter Converter and Roaster/Reverberatory Gas Streams,
PB 238095, National Technical Information Service, Springfield,VA, October
1974.
12. AP-42 Background Files, Office Of Air Quality Planning And Standards, U. S.
Environmental Protection Agency, Research Triangle Park, NC.
13. Design and Operating Parameters for Emission Control Studies, Kennecott-
McGill Copper Smelter, EPA-600/2-76-036c, U. S. Environmental Protection
Agency, Washington, DC, February 1976.
14. Emission Test Report (Acid Plant) of Phelps Dodge Copper Smelter, Ajo, AZ,
EMB-78-CUS-11, Office Of Air Quality Planning And Standards, Research
Triangle Park, NC, March 1979.
15. S. Dayton, "Inspiration's Design for Clean Air", Engineering and Mining
Journal, 175:6, June 1974.
16. Emission Testing of Asarco Copper Smelter, Tacoma, WA, EMB-78-CUS-12,
Office Of Air Quality Planning And Standards, U. S. Environmental Protec-
tion Agency, Research Triangle Park, NC, April 1979.
17. Written communication from A. L. Labbe, Asarco, Inc., Tacoma, WA, to S. T.
Cuffe, U. S. Environmental Protection Agency, Research Triangle Park, NC,
November 20, 1978.
18. Design and Operating Parameters for Emission Control Studies: Asarco-Hayden
Copper Smelter, EPA-600/2-76-036j, U. S. Environmental Protection Agency,
Washington, DC, February 1976.
19. Design and Operating Parameters for Emission Control Studies; Kennecott,
Hayden Copper Smelter, EPA-600/2-76-036b, U. S. Environmental Protection
Agency, Washington, DC, February 1976.
20. R. Larkin, Arsenic Emissions at Kennecott Copper Corporation, Hayden, AZ,
EPA-76-NFS-1, U. S. Environmental Protection Agency, Research Triangle
Park, NC, May 1977.
21. Emission Compliance Status, Inspiration Consolidated Copper Company,
Inspiration, AZ, U. S. Environmental Protection Agency, San Francisco, CA,
1980.
22. Written communication from M. P. Scanlon, Phelps Dodge Corporation,
Hidalgo, AZ, to D. R. Goodwin, U. S. Environmenal Protection Agency,
Research Triangle Park, NC, October 18, 1978.
23. Written communication from G. M. McArthur, The Anaconda Company, to D. R.
Goodwin, U. S. Environmental Protection Agency, Research Triangle Park,
NC, June 2, 1977.
24. Telephone communication from V. Katari, Pacific Environmental Services,
Durham, NC, to R. Winslow, Hidalgo Smelter, Phelps Dodge Corporation,
Hidalgo, AZ, April 1, 1982.
10/86 Metallurgical Industry 7.3-17
-------
25. Inhalable Particulate Source Category Report for the Nonferrous Industry,
Contract 68-02-3159, Acurex Corp., Mountain View, CA, August 1986.
26. Emission Test Report, Phelps Dodge Copper Smelter, Douglas, AZ, EMB-78-
CUS-8, Office Of Air Quality Planning And Standards, U. S. Environmental
Protection Agency, Research Triangle Park, NC, February 1979.
27. Emission Testing of Kennecott Copper Smelter, Magna, UT, EMB-78-CUS-13,
Office Of Air Quality Planning And Standards, U. S. Environmental Protec-
tion Agency, Research Triangle Park, NC, April 1979.
28. Emission Test Report, Phelps Dodge Copper Smelter, Ajo, AZ, EMB-78-CUS-9,
Office Of Air Quality Planning And Standards, U. S. Environmental Protec-
tion Agency, Research Triangle Park, NC, February 1979.
29. Written communication from R. D. Putnam, Asarco, Inc., to M. 0. Varner,
Asarco, Inc., Salt Lake City, UT, May 12, 1980.
30. Emission Test Report, Phelps Dodge Copper Smelter, Playas, NM, EMB-78-
CUS-10, Office Of Air Quality Planning And Standards, U. S. Environmental
Protection Agency, Research Triangle Park, NC, March 1979.
31. Asarco Copper Smelter, El Paso, TX, EMB-78-CUS-7', Office Of Air Quality
Planning And Standards, U. S. Environmental Protection Agency, Research
Triangle Park, NC, April 25, 1978.
32. A. D. Church, et al., "Measurement of Fugitive Particulate and Sulfur
Dioxide Emissions at Inco's Copper Cliff Smelter", Paper A-79-51, The
Metallurgical Society, American Institute of Mining, Metallurgical and
Petroleum Engineers (AIME), New York, NY.
33. Copper Smelters, Emission Test Report - Lead Emissions, EMB-79-CUS-14,
Office Of Air Quality Planning And Standards, U. S. Environmental Protec-
tion Agency, Research Triangle Park, NC, September 1979.
7.3-18 EMISSION FACTORS 10/86
-------
7.4 FERROALLY PRODUCTION
7.4.1 General
A ferroalloy is an alloy of iron and one or more other elements, such as
silicon, manganese or chromium. Ferroalloys are used as additives to impart
unique properties to steel and cast iron. The iron and steel industry consumes
approximately 95 percent of the ferroalloy produced in the United States. The
remaining 5 percent is used in the production of nonferrous alloys, including
cast aluminum, nickel/cobalt base alloys, titanium alloys, and in making other
ferroalloys.
Three major groups, ferrosilicon, ferromanganese, and ferrochrome, con-
stitute approximately 85 percent of domestic production. Subgroups of these
alloys include siliconmanganese, sil'i^on metal and ferrochromium. The variety
of grades manufactured is distinguished primarily by carbon, silicon or aluminum
content. The remaining 15 percent >of ferroalloy production is specialty alloys,
typically produced in small amounts and containing elements such as vanadium,
columbium, molybdenum, nickel, boron, aluminum and tungsten.
Ferroalloy facilities in the United States vary greatly in size. Many
facilities have only one furnace and require less than 25 megawatts. Others
consist of 16 furnaces, produce six different types of ferroalloys, and require
over 75 megawatts of electricity.
A typical ferroalloy plant is illustrated in Figure 7.4-1. A variety of
furnace types produces ferroalloys, including submerged electric arc furnaces,
induction furnaces, vacuum furnaces, exothermic reaction furnaces and elec-
trolytic cells. Furnace descriptions and their ferroalloy products are given
in Table 7.4-1. Ninety-five percent of all ferroalloys, including all bulk
ferroalloys, are produced in submerged electric arc furnaces, and it is the
furnace type principally discussed here.
The basic design of submerged electric arc furnaces is generally the same
throughout the ferroalloy industry in the United States. The submerged elec-
tric arc furnace comprises a cylindrical steel shell with a flat bottom or
hearth. The interior of the shell is lined with two or more layers of carbon
blocks. Raw materials are charged through feed chutes from above the furnace.
The molten metal and slag are removed through one or more tapholes extending
through the furnace shell at the hearth level. Three carbon electrodes,
arranged in a delta formation, extend downward through the charge material to
a depth of 3 to 5 feet to melt the charge.
Submerged electric arc furnaces are of two basic types, open and covered.
About 80 percent of submerged electric arc furnaces in the United States are of
the open type. Open furnaces have a fume collection hood at least one meter
above the top of the furnace. Moveable panels or screens sometimes are used to
reduce the open area between the furnace and hood to improve emissions capture
10/86 Metallurgical Industry 7.4-1
-------
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7.4-2
EMISSION FACTORS
10/86
-------
30. J. M. Kane, "Equipment For Cupola Control", American Foundryman's Society
Transactions, £4:525-531, 1956.
31. Control Techniques For Lead Air Emissions, 2 Volumes, EPA-450/2-77-012, U.
S. Environmental Protection Agency, Research Triangle Park, NC, December
1977.
32. W. E. Davis, Emissions Study Of Industrial Sources Of Lead Air Pollutants,
1970, APTD-1543, U. S. Environmental Protection Agency, Research Triangle
Park, NC, April 1973.
33. Emission Test No. EMB-71-CI-27, Office Of Air Quality Planning and Stan-
dards, U. S. Environmental Protection Agency, Research Triangle Park, NC,
February 1972.
34. Emission Test No. EMB-71-CI-30, Office Of Air Quality Planning And Stan-
dards, U. S. Environmental Protection Agency, Research Triangle Park, NC,
March 1972.
35. John Zoller, et al., Assessment Of Fugitive Particulate Emission Factors
For Industrial Processes, EPA-450/3-78-107, U. S. Environmental Protection
Agency, Research Triangle Park, NC, September 1978.
36. J. Jeffery, et al., Inhalable Particulate Source Category Report For The
Gray Iron Foundry Industry, TR-83-15-G, EPA Contract No. 68-02-3157, GCA
Corporation, Bedford, MA, July 1986.
10/86 Metallurgical Industry 7.10-21
-------
TABLE 7.4-1. FERROALLOY PROCESSES AND RESPECTIVE PRODUCT GROUPS
Process
Submerged arc furnace3
Exothermic^1
Silicon reduction
Aluminum reduction
Mixed aluminothermal/
silicothermal
Electrolyticc
Vacuum furnace^
Induction furnace6
Product
Silvery iron (15 - 22% Si)
Ferrosilicon (50% Si)
Ferrosilicon (65 - 75% Si)
Silicon metal
Silicon/manganese/zirconium (SMZ)
High carbon (HC) ferromanganese
Si1i conmanganes e
HC ferrochrome
Ferrochrome/silicon
FeSi (90% Si)
Low carbon (LC) ferrochrome, LC
ferromanganese, Medium carbon (MC)
ferromanganese
Chromium metal, FerrotItanium,
Ferrocolumbium, Ferrovanadium
Ferromolybdenum, Ferrotungsten
Chromium metal, Manganese metal
LC ferrochrome
Ferrotitanium
aProcess by which metal is smelted in a refractory lined cup shaped steel
shell by three submerged graphite electrodes.
"Process by which molten charge material is reduced, in exthermic reaction,
by addition of silicon, aluminum or combination of the two.
cProcess by which simple ions of a metal, usually chromium or manganese
in an electrolyte, are plated on cathodes by direct low voltage current.
^Process by which carbon is removed from so!4d state high carbon
ferrochrome within vacuum furnaces maintained at temperature near melting
point of alloy.
eProcess which converts electrical energy without electrodes into heat,
without electrodes, to melt metal charge in a cup or drum shaped vessel.
10/86
Metallurgical Industry
7.4-3
-------
efficiency. Covered furnaces have a water cooled steel cover to seal the top,
with holes through it for the electrodes. The degree of emission containment
provided by the covers is quite variable. Air infiltration sometimes is reduced
by placing charge material around the electrode holes. This type is called a
mix seal or semienclosed furnace. Another type is a sealed or totally closed
furnace having mechanical seals around the electrodes and a sealing compound
packed around the cover edges.
The submerged arc process is a reduction smelting operation. The reactants
consist of metallic ores and quartz (ferrous oxides, silicon oxides, manganese
oxides, chrome oxides, etc.). Carbon, usually as coke, low volatility coal or
wood chips, is charged to the furnace as a reducing agent. Limestone also may
be added as a flux material. After crushing, sizing, and in some cases, dry-
ing, the raw materials are conveyed to a mix house for weighing and blending,
thence by conveyors, buckets, skip hoists, or cars to hoppers above the furnace.
The mix is then fed by gravity through a feed chute either continuously or
intermittently, as needed. At high temperatures in the reaction zone the car-
bon sources react chemically with oxygen in the metal oxides to form carbon mon-
oxide and to reduce the ores to base metal. A typical reaction, illustrating 50
percent ferrosilicon production, is:
Fe2C>3 + 2 Si02 + 7C -»• 2 FeSi + 7CO.
Smelting in an electric arc furnace is accomplished by conversion of
electrical energy to heat. An alternating current applied to the electrodes
causes a current flow through the charge between the electrode tips. This
provides a reaction zone of temperatures up to 2000°C (3632°F). The tip of
each electrode changes polarity continuously as the alternating current flows
between the tips. To maintain a uniform electric load, electrode depth is con-
tinuously varied automatically by mechanical or hydraulic means, as required.
Furnace power requirements vary from 7 megawatts to over 50 megawatts, depending
upon the furnace size and the product being made. The average is 17.2 mega-
watts^". Electrical requirements for the most common ferroalloys are given in
Table 7.4-2.
TABLE 7.4-2. FURNACE POWER REQUIREMENTS FOR DIFFERENT FERROALLOYS
Product
50% FeSi
Silicon metal
High carbon FeMn
High carbon FeCr
SiMn
Furnace load
(kw-hr/lb alloy produced)
Range
2.4 - 2.5
6.0 - 8.0
1.0 - 1.2
2.0 - 2.2
2.0 - 2.3
Approximate
average
2.5
7.0
1.2
2.1
2.2
i
7.4-4
EMISSION FACTORS
10/86
-------
The molten alloy and slag that accumulate on the furnce hearth are removed
at 1 to 5 hour intervals through the taphole. Tapping typically lasts 10 to 15
minutes. Tapholes are opened with a pellet shot from a gun, by drilling or by
oxygen lancing. The molten metal and slag flow from the taphole into a carbon
lined trough, then into a carbon lined runner which directs the metal and slag
into a reaction ladle, ingot molds, or chills. Chills are low flat iron or
steel pans that provide rapid cooling of the molten metal. Tapping is termin-
ated and the furnace resealed by inserting a carbon paste plug into the taphole.
When chemistry adjustments after furnace smelting are necessary to produce
a specified product, a reaction ladle is used. Ladle treatment reactions are
batch processes and may include chlorination, oxidation, gas mixing, and slag-
metal reactions.
During tapping, and/or in the reaction ladle, slag is skimmed from the
surface of the molten metal. It can be disposed of in landfills, sold as road
ballast, or used as a raw material in a furnace or reaction ladle to produce a
chemically related ferroalloy product.
After cooling and solidifying, the large ferroalloy castings are broken
with drop weights or hammers. The broken ferroalloy pieces are then crushed,
screened (sized) and stored in bins until shipment.
7.4.2 Emissions And Controls
Particulate is generated from several activities at a ferroalloy facility,
including raw material handling, smelting and product handling. The furnaces
are the largest potential sources of particulate emissions. The emission fac-
tors in Tables 7.4-3 and 7.4-4 and the particle size information in Figures
7.4-2 through 7.4-11 reflect controlled and uncontrolled emissions from ferro-
alloy smelting furnaces. Emission factors for sulfur dioxide, carbon monoxide
and organic emissions are presented in Table 7.4-5.
Electric arc furnaces emit particulate in the form of fume, accounting for
an estimated 94 percent of the particulate emissions in the ferroalloy industry.
Large amounts of carbon monoxide and organic materials also are emitted by sub-
merged electric arc furnaces. Carbon monoxide is formed as a byproduct of the
chemical reaction between oxygen in the metal oxides of the charge and carbon
contained in the reducing agent (coke, coal, etc.). Reduction gases containing
organic compounds and carbon monoxide continuously rise from the high temper-
ature reaction zone, entraining fine particles and fume precursors. The mass
weight of carbon monoxide produced sometimes exceeds that of the metallic
product (see Table 7.4-5). The chemical constituents of the heat induced fume
consist of oxides of the products being produced, carbon from the reducing
agent, and enrichment by SiC^, CaO and MgO, if present in the charge. "
In an open electric arc furnace, all carbon monoxide burns with induced
air at the furnace top. The remaining fume, captured by hooding about 1 meter
above the furnace, is directed to a gas cleaning device. Baghouses are used to
control emissions from 85 percent of the open furnaces in the United States.
10/86 Metallurgical Industry 7.4-5
-------
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EMISSION FACTORS
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efore and after control device. Where other emissions
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high energy, with A P >20 in. HjO.
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Metallurgical Industry
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10/86
Metallurgical Industry
7.4-9
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10/86
Metallurgical Industry
7.4-11
-------
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PARTICLE DIAMETER, micrometers
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size distribution.
7.4-12
EMISSION FACTORS
10/86
-------
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99.990
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TOTAL PARTICIPATE
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10/86
Metallurgical Industry
7.4-13
-------
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TOTAL PARTICIPATE kg PARTICIPATE
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PARTICLE DIAMETER, micrometers
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7.4-14
EMISSION FACTORS
10/86
-------
w
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99.990
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TOTAL PARTICIPATE
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PARTICLE DIAMETER, micrometers
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Figure 7.4-5. Controlled (baghouse), 80% FeMn producing, open furnace
size distribution
10/86
Metallurgical Industry
7.4-15
-------
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Figure 7.4-6. Uncontrolled, Si metal producing, open furnace
particle size distribution
7.4-16
EMISSION FACTORS
10/86
-------
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PARTICLE DIAMETER, micrometers
Figure 7.4-7. Controlled (baghouse), Si metal producing, open
furnace particle size distribution
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10/86
Metallurgical Industry
7.4-17
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EMISSION RATE
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7.4-18
EMISSION FACTORS
10/86
-------
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EMISSION RATE
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10/86
Metallurgical Industry
7.4-19
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92
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Figure 7.4-10. Uncontrolled, SiMn producing, open furnace
particle size distribution
7.4-20
EMISSION FACTORS
10/86
-------
99.990
99.950
99.90
99.80
99.50
99
98
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EMISSION RATE = ^ Mg ALLOY
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2.10
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10/86
Metallurgical Industry
7.4-21
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EMISSION FACTORS
10/86
-------
Scrubbers are used on 13 percent of the furnaces, and electrostatic precipita-
tors on 2 percent. Control efficiences for well designed and operated control
systems [i. e., baghouses with air to cloth ratios of 1:1 to 2:1 ft^/ft2, and
and scrubbers with a pressure drop from 14 to 24 kilopascals (kPa) (55 to 96
inches H20)], have been reported to be in excess of 99 percent. Air to cloth
ratio is the ratio of the volumetric air flow through the filter media to the
media area.
Two emission capture systems, not usually connected to the same gas clean-
ing device, are necessary for covered furnaces. A primary capture system with-
draws gases from beneath the furnace cover. A secondary system captures fume
released around the electrode seals and during tapping. Scrubbers are used
almost exclusively to control exhaust gases from sealed furnaces. The gas from
sealed and mix sealed furnaces is usually flared at the exhaust of the scrub-
ber. The carbon monoxide rich gas has an estimated heating value of 300 Btu
per cubic foot and is sometimes used as a fuel in kilns and sintering machines.
The efficiency of flares for the control of carbon monoxide and the reduction
of organic emission has been estimated to be greater than 98 percent for steam
assisted flares with a velocity of less than 60 feet per second and a gas heat-
ing value of 300 Btu per standard cubic foot2^. For unassisted flares, the
reduction of organic and carbon monoxide emissions is 98 percent efficient with
a velocity of less than 60 feet per second and a gas heating value greater than
200 Btu per standard cubic foot.2^
Tapping operations also generate fumes. Tapping is intermittent and is
usually conducted during 10 to 20 percent of the furnace operating time. Some
fumes originate from the carbon lip liner, but most are a result of induced
heat transfer from the molten metal or slag as it contacts the runners, ladles,
casting beds and ambient air. Some plants capture these emissions to varying
degrees with a main canopy hood. Other plants employ separate tapping hoods
ducted to either the furnace emission control device or a separate control
device. Emission factors for tapping emissions are unavailable because of a
lack of data.
A reaction ladle may be involved to adjust the metallurgy after furance
tapping by chlorination, oxidation, gas mixing and slag metal reactions. Ladle
reactions are an intermittent process, and emissions have not been quantified.
Reaction ladle emissions often are captured by the tapping emissions control
system.
Available data are insufficient to provide emission factors for raw
material handling, pretreatment and product handling. Dust particulate is
emitted from raw material handling, storage and preparation activities (see
Figure 7.4-1), from such specific activities as unloading of raw materials from
delivery vehicles (ship, railcar or truck), storage of raw materials in piles,
loading of raw materials from storage piles into trucks or gondola cars and
crushing and screening of raw materials. Raw materials may be dried before
charging in rotary or other type dryers, and these dryers can generate signif-
icant particulate emissions. Dust may also be generated by heavy vehicles used
for loading, unloading and transferring material. Crushing, screening and
storage of the ferroalloy product emit particulate in the form of dust. The
10/86 Metallurgical Industry 7.4-23
-------
properties of particulate emitted as dust are similar to the natural properties
of the ores or alloys from which they originated, ranging in size from 3 to 100
micrometers.
Approximately half of ferroalloy facilities have some type of control for
dust emissions. Dust generated from raw material storage may be controlled
in several ways, including sheltering storage piles from the wind with block
walls, snow fences or plastic covers. Occasionally, piles are sprayed with
water to prevent airborne dust. Emissions generated by heavy vehicle traffic
may be reduced by using a wetting agent or paving the plant yard.3 Moisture
in the raw materials, which may be as high as 20 percent, helps to limit dust
emissions from raw material unloading and loading. Dust generated by crushing,
sizing, drying or other pretreatment activities is sometimes controlled by dust
collection equipment such as scrubbers, cyclones or baghouses. Ferroalloy pro-
duct crushing and sizing usually require a baghouse. The raw material emission
collection equipment may be connected to the furnace emission control system.
For fugitive emissions from open sources, see Section 11.2 of this document.
References for Section 7.4
1. F. J. Schottman, "Ferroalloys", 1980 Mineral Facts and Problems, Bureau Of
Mines, U. S. Department Of The Interior, Washington, DC, 1980.
2. J. 0. Dealy, and A. M. Killin, Engineering and Cost Study of the Ferroalloy
Industry, EPA-450/2-74-008, U. S. Environmental Protection Agency, Research
Triangle Park, NC, May 1974.
3. Backgound Information on Standards of Performance; Electric Submerged Arc
Furnaces for Production of Ferroalloys, Volume I: Proposed Standards,
EPA-450/2-74-018a, U. S. Environmental Protection Agency, Research Triangle
Park, NC, October 1974.
4. C. W. Westbrook, and D. P. Dougherty, Level I Environmental Assessment of
Electric Submerged Arc Furnaces Producing Ferroalloys, EPA-600/2-81-038,
U. S. Environmental Protection Agency, Washington, DC, March 1981.
5. F. J. Schottman, "Ferroalloys", Minerals Yearbook, Volume I: Metals and
Minerals, Bureau Of Mines, Department Of The Interior, Washington, DC,
T980T
6. S. Beaton and H. Klemm, Inhalable Particulate Field Sampling Program for
the Ferroalloy Industry, TR-80-115-G, GCA Corporation, Bedford, MA,
November 1980.
7. G. W. Westbrook and D. P. Dougherty, Environmental1 Impact of Ferroalloy
Production Interim Report: Assessment of Current Data, Research Triangle
Institute, Research Triangle Park, NC, November 1978.
8. K. Wark and C. F. Warner, Air Pollution; Its Origin and Control, Harper
and Row Publisher, New York, 1981.
7.4-24 EMISSION FACTORS 10/86
-------
9. M. Szabo and R. Gerstle, Operations and Maintenance of Particulate Control
Devices on Selected Steel~and Ferroalloy Processes, EPA-600/2-78-037, U. S.
Environmental Protection Agency, Washington, DC, March 1978.
10. C. W. Westbrook, Multimedia Environmental Assessment of Electric Submerged
Arc Furnaces Producing Ferroalloys, EPA-600/2-83-092, U. S. Environmental
Protection Agency, Washington, DC, September 1983.
11. S. Gronberg, et al., Ferroalloy Industry Particulate Emissions: Source
Category Report, EPA-600/7-86-039, U. S. Environmental Protection Agency,
Cincinnati, OH, November 1986.
12. T. Epstein, et al., Ferroalloy Furnace Emission Factor Development, Roane
Limited, Rockwood, Tennessee, EPA-600/X-85-325, U. S. Environmental Pro-
tection Agency, Washington, DC, June 1981.
13. S. Beaton, et al., Ferroalloy Furnace Emission Factor Development, Inter-
lake Inc., Alabama Metallurgical Corp., Selma, Alabama, EPA-600/X-85-324,
U. S. Environmental Protection Agency, Washington, DC, May 1981.
14. J. L. Rudolph, jit al., Ferroalloy Process Emissions Measurement, EPA-600/
2-79-045, U. S. Environmental Protection Agency, Washington, DC, February
1979.
15. Written communication from Joseph F. Eyrich, Macalloy Corporation, Charles-
ton, SC to GCA Corporation, Bedford, MA, February 10, 1982, citing Airco
Alloys and Carbide test R-07-7774-000-1, Gilbert Commonwealth, Reading,
PA, 1978.
16. Source test, Airco Alloys and Carbide, Charleston, SC, EMB-71-PC-16(FEA),
U. S. Environmental Protection Agency, Research Triangle Park, NC, 1971.
17. Telephone communication between Joseph F. Eyrich, Macalloy Corporation,
Charleston, SC and Evelyn J. Limberakis, GCA Corporation, Bedford, MA,
February 23, 1982.
18. Source test, Chromium Mining and Smelting Corporation, Memphis, TN, EMB-
72-PC-05 (FEA), U. S. Environmental Protection Agency, Research Triangle
Park, NC, June 1972.
19. Source test, Union Carbide Corporation, Ferroalloys Division, Marietta,
Ohio, EMB-71-PC-12(FEA), U. S. Environmental Protection Agency, Research
Triangle Park, NC, 1971.
20. R. A. Person, "Control of Emissions from Ferroalloy Furnace Processing",
Journal Of Metals, ^3(4):17-29, April 1971.
21. S. Gronberg, Ferroalloy Furnace Emission Factor Development Foote Minerals,
Graham, W. Virginia, EPA-600/X-85-327, U. S. Environmental Protection
Agency, Washington, DC, July 1981.
22. R. W. Gerstle, et al., Review of Standards of Performance for New Station-
ary Air Sources - Ferroalloy Production Facility, EPA-450/3-80-041, U. S.
Environmental Protection Agency, Research Triangle Park, NC, December 1980.
10/86 Metallurgical Industry 7.4-25
-------
23. Air Pollutant Emission Factors, Final Report, APTD-0923, U. S. Environ-
mental Protection Agency, Research Triangle Park, NC, April 1970.
24. Telephone communication between Leslie B. Evans, Office Of Air Quality
Planning And Standards, U. S. Environmental Protection Agency, Research
Triangle Park, NC, and Richard Vacherot, GCA Corporation, Bedford, MA,
October 18, 1984.
25. R. Ferrari, Experiences in Developing an Effective Pollution Control
System for a Submerged Arc Ferroalloy Furnace Operation, J. Metals,
p. 95-104, April 1968.
26. Fredriksen and Nestaas, Pollution Problems by Electric Furnace Ferroalloy
Production, United Nations Economic Commission for Europe, September 1968.
27. A. E. Vandergrift, et al., Farticulate Pollutant System Study - Mass Emis-
sions, PB-203-128, PB-203-522 and P-203-521, National Technical Information
Service, Springfield, VA, May 1971.
28. Control Techniques for Lead Air Emissions, EPA-450/2-77-012, U. S. Environ-
mental Protection Agency, Research Triangle Park, NC, December 1977.
29. W. E. Davis, Emissions Study of Industrial Sources of Lead Air Pollutants,
1970, EPA-APTD-1543, W. E. Davis and Associates, Leawood, KS, April 1973.
30. Source test, Foote Mineral Company, Vancoram Operations, Steubenville, OH,
EMB-71-PC-08(FEA), U. S. Environmental Protection Agency, Research Triangle
Park, NC, August 1971.
7.4-26 EMISSION FACTORS 10/86
-------
7.5 IRON AND STEEL PRODUCTION
7.5.1 Process Descriptionl-3
The production of steel at an integrated iron and steel plant is
accomplished using several interrelated processes. The major operations are:
(1) coke production, (2) sinter production, (3) iron production, (4) iron
preparation, (5) steel production, (6) semifinished product preparation, (7)
finished product preparation, (8) heat and electricity supply, and (9) handling
and transport of raw, intermediate and waste materials. The interrelation of
these operations is depicted in a general flow diagram of the iron and steel
industry in Figure 7.5-1. Coke production is discussed in detail in Section
7.2 of this publication, and more information on the handling and transport of
materials is found in Chapter 11.
7.5.1.1 Sinter Production - The sintering process converts fine sized raw
materials, including iron ore, coke breeze, limestone, mill scale, and flue
dust, into an agglomerated product, sinter, of suitable size for charging into
the blast furnace. The raw materials are sometimes mixed with water to provide
a cohesive matrix, and then placed on a continuous, travelling grate called the
sinter strand. A burner hood, at the beginning of the sinter strand ignites
the coke in the mixture, after which the combustion is self supporting and it
provides sufficient heat, 1300 to 1480°C (2400 to 2700°F), to cause surface
melting and agglomeration of the mix. On the underside of the sinter strand
is a series of windboxes that draw combusted air down through the material
bed into a common duct leading to a gas cleaning device. The fused sinter is
discharged at the end of the sinter strand, where it is crushed and screened.
Undersize sinter is recycled to the mixing mill and back to the strand. The
remaining sinter product is cooled in open air or in a circular cooler with
water sprays or mechanical fans. The cooled sinter is crushed and screened for
a final time, then the fines are recycled, and the product is sent to be charged
to the blast furnaces. Generally, 2.5 tons of raw materials, including water
and fuel, are required to produce one ton of product sinter.
7.5.1.2 Iron Production - Iron is produced in blast funaces by the reduction
of iron bearing materials with a hot gas. The large, refractory lined furnace
is charged through its top with iron as ore, pellets, and/or sinter; flux as
limestone, dolomite and sinter; and coke for fuel. Iron oxides, coke and fluxes
react with the blast air to form molten reduced iron, carbon monoxide and slag.
The molten iron and slag collect in the hearth at the base of the furnace. The
byproduct gas is collected through offtakes located at the top of the furnace
and is recovered for use as fuel.
The production of one ton of iron requires 1.4 tons of ore or other iron
bearing material; 0.5 to 0.65 tons of coke; 0.25 tons of limestone or dolomite;
and 1.8 to 2 tons of air. Byproducts consist of 0.2 to 0.4 tons of slag, and
2.5 to 3.5 tons of blast furnace gas containing up to 100 Ibs of dust.
The molten iron and slag are removed, or cast, from the furnace perio-
dically. The casting process begins with drilling a hole, called the taphole,
into the clay filled iron notch at the base of the hearth. During casting,
molten iron flows into runners that lead to transport ladles. Slag also flows
10/86 Metallurgical Industry 7.5-1
-------
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10/86
-------
into the clay filled iron notch at the base of the hearth. During casting,
molten iron flows into runners that lead to transport ladles. Slag also flows
from the furnace, and is directed through separate runners to a slag pit
adjacent to the casthouse, or into slag pots for transport to a remote slag
pit. At the conclusion of the cast, the taphole is replugged with clay. The
area around the base of the furnace, including all iron and slag runners, is
enclosed by a casthouse. The blast furnace byproduct gas, which is collected
from the furnace top, contains carbon monoxide and particulate. Because of
its high carbon monoxide content, this blast furnace gas has a low heating
value, about 2790 to 3350 joules per liter (75 to 90 BTU/ft3) and is used as a
fuel within the steel plant. Before it can be efficiently oxidized, however,
the gas must be cleaned of particulate. Initially, the gases pass through a
settling chamber or dry cyclone to remove about 60 percent of the particulate.
Next, the gases undergo a one or two stage cleaning operation. The primary
cleaner is normally a wet scrubber, which removes about 90 percent of the
remaining particulate. The secondary cleaner is a high energy wet scrubber
(usually a venturi) or an electrostatic precipitator, either of which can
remove up to 90 percent of the particulate that eludes the primary cleaner.
Together these control devices provide a clean fuel of less than 0.05 grams
per cubic meter (0.02 gr/ft3). A portion of this gas is fired in the blast
furnace stoves to preheat the blast air, and the rest is used in other plant
operations.
7.5.1.3 Iron Preparation Hot Metal Desulfurization - Sulfur in the molten
iron is sometimes reduced before charging into the steelmaking furnace by
adding reagents. The reaction forms a floating slag which can be skimmed off.
Desulfurization may be performed in the hot metal transfer (torpedo) car at a
location between the blast furnace and basic oxygen furnace (BOF), or it may
be done in the hot metal transfer (torpedo) ladle at a station inside the BOF
shop.
The most common reagents are powdered calcium carbide (CaC2) and calcium
carbonate (CaC03) or salt coated magnesium granules. Powdered reagents are
injected into the metal through a lance with high pressure nitrogen. The pro-
cess duration varies with the injection rate, hot metal chemistry, and desired
final sulfur content, and is in the range of 5 to 30 minutes.
7.5.1.4 Steelmaking Process - Basic Oxygen Furnaces - In the basic oxygen
process (BOP), molten iron from a blast furance and iron scrap are refined in
a furnace by lancing (or injecting) high purity oxygen. The input material is
typically 70 percent molten metal and 30 percent scrap metal. The oxygen reacts
with carbon and other impurities to remove them from the metal. The reactions
are exothermic, i. e., no external heat source is necessary to melt the scrap
and to raise the temperature of the metal to the desired range for tapping.
The large quantities of carbon monoxide (CO) produced by the reactions in the
BOF can be controlled by combustion at the mouth of the furnace and then vented
to gas cleaning devices, as with open hoods, or combustion can be suppressed at
the furnace mouth, as with closed hoods. BOP steelmaking is conducted in large
(up to 400 ton capacity) refractory lined pear shaped furnaces. There are two
major variations of the process. Conventional BOFs have oxygen blown into the
top of the furnace through a water cooled lance. In the newer, Quelle Basic
Oxygen process (Q-BOP), oxygen is injected through tuyeres located in the bot-
tom of the furnace. A typical BOF cycle consists of the scrap charge, hot
metal charge, oxygen blow (refining) period, testing for temperature and
10/86 Metallurgical Industry
7.5-3
-------
chemical composition of the steel, alloy additions and reblows (if necessary),
tapping, and slagging. The full furnace cycle typically ranges from 25 to 45
minutes.
7.5.1.5 Steelmaking Process - Electric Arc Furnace - Electric arc furnaces
(EAF) are used to produce carbon and alloy steels. The input material to an
EAF is typically 100 percent scrap. Cylindrical, refractory lined EAFs are
equipped with carbon electrodes to be raised or lowered through the furnace
roof. With electrodes retracted, the furnace roof can be rotated aside to
permit the charge of scrap steel by overhead crane. Alloying agents and flux-
ing materials usually are added through the doors on the side of the furnace.
Electric current of the opposite polarity electrodes generates heat between the
electrodes and through the scrap. After melting and refining periods, the slag
and steel are poured from the furnace by tilting.
The production of steel in an EAF is a batch process. Cycles, or "heats",
range from about 1 1/2 to 5 hours to produce carbon steel and from 5 to 10
hours or more to produce alloy steel. Scrap steel is charged to begin a cycle,
and alloying agents and slag materials are added for refining. Stages of each
cycle normally are charging and melting operations, refining (which usually
includes oxygen blowing), and tapping.
7.5.1.6 Steelmaking Process-Open Hearth Furnaces - The open hearth furnace
(OHF) is a shallow, refractory-lined basin in which scrap and molten iron are
melted and refined into steel. Scrap is charged to the furnace through doors
in the furnace front. Hot metal from the blast furnace is added by pouring
from a ladle through a trough positioned in the door. The mixture of scrap
and hot metal can vary from all scrap to all hot metal, but a half and half
mixture is most common. Melting heat is provided by gas burners above and at
the side of the furnace. Refining is accomplished by the oxidation of carbon
in the metal and the formation of a limestone slag to remove impurities. Most
furnaces are equipped with oxygen lances to speed up melting and refining.
The steel product is tapped by opening a hole in the base of the furnace with
an explosive charge. The open hearth Steelmaking process with oxygen lancing
normally requires from 4 to 10 hours for each heat.
7.5.1.7 Semifinished Product Preparation - After the steel has been tapped,
the molten metal is teemed (poured) into ingots which are later heated and
formed into other shapes, such as blooms, billets, or slabs. The molten steel
may bypass this entire process and go directly to a continuous casting opera-
tion. Whatever the production technique, the blooms, billets, or slabs undergo
a surface preparation step, scarfing, which removes surface defects before
shaping or rolling. Scarfing can be performed by a machine applying jets of
oxygen to the surface of hot semifinished steel, or by hand (with torches) on
cold or slightly heated semifinished steel.
7.5.2 Emissions And Controls
7.5.2.1 Sinter - Emissions from sinter plants are generated from raw material
handling, windbox exhaust, discharge end (associated sinter crushers and hot
screens), cooler and cold screen. The windbox exhaust is the primary source
of particulate emissions, mainly iron oxides, sulfur oxides, carbonaceous com-
7.5-4 EMISSION FACTORS 10/86
-------
pounds, aliphatic hydrocarbons, and chlorides. At the discharge end, emissions
are mainly iron and calcium oxides. Sinter strand windbox emissions commonly
are controlled by cyclone cleaners followed by a dry or wet ESP, high pressure
drop wet scrubber, or baghouse. Crusher and hot screen emissions, usually con-
trolled by hooding and a baghouse or scrubber, are the next largest emissions
source. Emissions are also generated from other material handling operations.
At some sinter plants, these emissions are captured and vented to a baghouse.
7.5.2.2 Blast Furnace - The primary source of blast furnace emissions is the
casting operation. Particulate emissions are generated when the molten iron
and slag contact air above their surface. Casting emissions also are generated
by drilling and plugging the taphole. The occasional use of an oxygen lance
to open a clogged taphole can cause heavy emissions. During the casting opera-
tion, iron oxides, magnesium oxide and carbonaceous compounds are generated as
particulate. Casting emissions at existing blast furnaces are controlled by
evacuation through retrofitted capture hoods to a gas cleaner, or by suppres-
sion techniques. Emissions controlled by hoods and an evacuation system are
usually vented to a baghouse. The basic concept of suppression techniques is
to prevent the formation of pollutants by excluding ambient air contact with
the molten surfaces. New furnaces have been constructed with evacuated runner
cover systems and local hooding ducted to a baghouse.
Another potential source of emissions is the blast furnace top. Minor
emissions may occur during charging from imperfect bell seals in the double
bell system. Occasionally, a cavity may form in the blast fuernace charge,
causing a collapse of part of the burden (charge) above it. The resulting
pressure surge in the furnace opens a relief valve to the atmosphere to pre-
vent damage to the furnace by the high pressure created and is referred to as
a "slip".
7.5.2.3 Hot Metal Desulfurization - Emissions during the hot metal desulfur-
ization process are created by both the reaction of the reagents injected into
the metal and the turbulence during injection. The pollutants emitted are
mostly iron oxides, calcium oxides and oxides of the compound injected. The
sulfur reacts with the reagents and is skimmed off as slag. The emissions
generated from desulfurization may be collected by a hood positioned over the
ladle and vented to a baghouse.
7.5.2.4 Steelmaking - The most significant emissions from the EOF process
occur during the oxygen blow period. The predominant compounds emitted are
iron oxides, although heavy metals and fluorides are usually present. Charging
emissions will vary with the quality and quantity of scrap metal charged to the
furnace and with the pour rate. Tapping emissions include iron oxides, sulfur
oxides, and other metallic oxides, depending on the grade of scrap used. Hot
metal transfer emissions are mostly iron oxides.
BOFs are equipped with a primary hood capture system located directly
over the open mouth of the furnaces to control emissions during oxygen blow
periods. Two types of capture systems are used to collect exhaust gas as it
leaves the furnace mouth: closed hood (also known as an off gas, or 0. G.,
system) or open, combustion type hood. A closed hood fits snugly against the
furnace mouth, ducting all particulate and carbon monoxide to a wet scrubber
10/86 Metallurgical Industry 7.5-5
-------
gas cleaner. Carbon monoxide is flared at the scrubber outlet stack. The open
hood design allows dilution air to be drawn into the hood, thus combusting the
carbon monoxide in the hood system. Charging and tapping emissions are con-
trolled by a variety of evacuation systems and operating practices. Charging
hoods, tapside enclosures, and full furnace enclosures are used in the industry
to capture these emissions and send them to either the primary hood gas cleaner
or a second gas cleaner.
7.5.2.5 Steelmaking - Electric Arc Furnace - The operations which generate
emissions during the electric arc furnace Steelmaking process are melting and
refining, charging scrap, tapping steel, and dumping slag. Iron oxide is the
predominant constituent of the particulate emitted during melting. During
refining, the primary particulate compound emitted is calcium oxide from the
slag. Emissions from charging scrap are difficult to quantify, because they
depend on the grade of scrap utilized. Scrap emissions usually contain iron
and other metallic oxides from alloys in the scrap metal. Iron oxides and
oxides from the fluxes are the primary constituents of the slag emissions.
During tapping, iron oxide is the major particulate compound emitted.
Emission control techniques involve an emission capture system and a gas
cleaning system. Five emission capture systems used in the industry are
fourth hold (direct shell) evacuation, side draft hood, combination hood, can-
opy hood, and furnace enclosures. Direct shell evacuation consists of ductwork
attached to a separate or fourth hole in the furnace roof which draws emissions
to a gas cleaner. The fourth hole system works only when the furnace is up-
right with the roof in place. Side draft hoods collect furnace off gases from
around the electrode holes and the work doors after the gases leave the furnace.
The combination hood incorporates elements from the side draft and fourth hole
ventilation systems. Emissions are collected both from the fourth hole and
around the electrodes. An air gap in the ducting introduces secondary air for
combustion of CO in the exhaust gas. The combination hood requires careful
regulation of furnace interval pressure. The canopy hood is the least effi-
cient of the four ventilation systems, but it does capture emissions during
charging and tapping. Many new electric arc furnaces incorporate the canopy
hood with one of the other three systems. The full furnace enclosure com-
pletely surrounds the furnace and evacuates furnace emissions through hooding
in the top of the enclosure.
7.5.2.6 Steelmaking - Open Hearth Furnace - Particulate emissions from an open
hearth furnace vary considerably during the process. The use of oxygen lancing
increases emissions of dust and fume. During the melting and refining cycle,
exhaust gas drawn from the furnace passes through a slag pocket and a regener-
ative checker chamber, where some of the particulate settles out. The emissions,
mostly iron oxides, are then ducted to either an ESP or a wet scrubber. Other
furnace related process operations which produce fugitive emissions inside the
shop include transfer and charging of hot metal, charging of scrap, tapping
steel and slag dumping. These emissions are usually uncontrolled.
7.5.2.7 Semifinished Product Preparation - During this activity, emissions are
produced when molten steel is poured (teemed) into ingot molds, and when semi-
finished steel is machine or manually scarfed to remove surface defects.
Pollutants emitted are iron and other oxides (FeO, Fe203, Si02, CaO, MgO).
7.5-6 EMISSION FACTORS 10/86
-------
Teeming emissions are rarely controlled. Machine scarfing operations generally
use as ESP or water spray chamber for control. Most hand scarfing operations
are uncontrolled.
7.5.2.8 Miscellaneous Combustion - Every iron and steel plant operation
requires energy in the form of heat or electricity. Combustion sources that
produce emissions on plant property are blast furnace stoves, boilers, soaking
pits, and reheat furnaces. These facilities burn combinations of coal, No. 2
fuel oil, natural gas, coke oven gas, and blast furnace gas. In blast furnace
stoves, clean gas from the blast furnace is burned to heat the refractory
checker work, and in turn, to heat the blast air. In soaking pits, ingots are
heated until the temperature distribution over the cross section of the ingots
is acceptable and the surface temperature is uniform for further rolling into
semifinished products (blooms, billets and slabs). In slab furnaces, a slab is
heated before being rolled into finished products (plates, sheets or strips).
Emissions from the combustion of natural gas, fuel oil or coal in the soaking
pits or slab furnaces are estimated to be the same as those for boilers. (See
Chapter 1 of this document.) Emission factor data for blast furnace gas and
coke oven gas are not available and must be estimatexW There are three facts
available for making the estimation. First, the gas exiting the blast furnace
passes through primary and secondary cleaners and can be cleaned to less than
0.05 grams per cubic meter (0.02 gr/ft^). Second, nearly one third of the
coke oven gas is methane. Third, there are no blast furnace gas constituents
that generate particulate when burned. The combustible constituent of blast
furnace gas is CO, which burns clean. Based on facts one and three, the emis-
sion factor for combustion of blast furnace gas is equal to the particulate
loading of that fuel, 0.05 grams per cubic meter (2.9 lb/10^ ft^) having an
average heat value of 83 BTU/ft^.
Emissions for combustion of coke oven gas can be estimated in the same
fashion. Assume that cleaned coke oven gas has as much particulate as cleaned
blast furnace gas. Since one third of the coke oven gas is methane, the main
component of natural gas, it is assumed that the combustion of this methane in
coke oven gas generates 0.06 grams per cubic meter (3.3 lb/10^ ft^) of partic-
ulate. Thus, the emission factor for the combustion of coke oven gas is the
sum of the particulate loading and that generated by the methane combustion, or
0.1 grams per cubic meter (6.2 lb/10^ ft^) having an average heat value of 516
BTU/ft3.
The particulate emission factors for procfes'ses la Table 7.5-1 are the
result of an extensive investigation by EPA and the American Iron and Steel
Institute.3 Particle size distributions for controlled and uncontrolled emis-
sions from specific iron and steel' industry processes have been calculated and
summarized from the best available data.l Size distributions have been used
with particulate emission factors to calculate size specific factors for the
sources listed in Table 7.5-1 for which data are available. Table 7.5-2
presents these size specific particulate emission factors. Particle size dis-
tributions are presented in Figures 7.5-2 to 7.5-4. Carbon monoxide emission
factors are in Table 7.5-3.6
10/86 Metallurgical Industry 7.5-7
-------
TABLE 7.5-1. PARTICULATE EMISSION FACTORS FOR IRON AND STEEL MILLS3
Source
Sintering
Windbox
Uncontrolled
Leaving grate
After coarse partic-
ulate removal
Controlled by dry ESP
Controlled by wet ESP
Controlled by venturi
scrubber
Controlled by cyclone
Sinter discharge (breaker
and hot screens)
Uncontrolled
Controlled by baghouse
Controlled by venturi
scrubber
Windbox and discharge
Controlled by baghouse
Blast furnace
Slip
Uncontrolled casthouse
Roof Monitor'5
Furnace with local
evacuation0
Taphole and trough only
(not runners)
Hot metal desulf urlzation
Uncontrolled"1
Controlled by baghouse
Basic oxygen furnace (EOF)
Top blown furnace melting
and refining
Uncontrolled
Controlled by open hood
vented to:
ESP
Scrubber
Controlled by closed hood
vented to:
Scrubber
Units
kg/Mg (Ib/ton) finished
sinter
kg/Mg (Ib/ton) finished
sinter
kg/Mg (Ib/ton) finished
sinter
kg/Mg (Ib/ton) slip
kg/Mg (Ib/ton) hot metal
kg/Mg (Ib/ton) hot metal
kg/Mg (Ib/ton) steel
Emission Factor
5.56 (11.1)
4.35 (8.7)
0.8 (1.6)
0.085 (0.17)
0.235 (0.47)
0.5 (1.0)
3.4 (6.8)
0.05 (0.1)
0.295 (0.59)
0.15 (0.3)
39.5 (87.0)
0.3 (0.6)
0.65 (1.3)
0.15 (0.3)
0.55 (1.09)
0.0045 (0.009)
14.25 (28.5)
0.065 (0.13)
0.045 (0.09)
0.0034 (0.0068)
Emission
Factor
Rating
B
A
B
B
B
B
B
B
A
A
D
B
B
B
D
D
B
A
B
A
Particle
Size
Data
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
7.5-8
EMISSION FACTORS
10/86
-------
TABLE 7.5-1 (cont.). PARTICULATE.EMISSION FACTORS FOR IRON AND STEEL MILLS3
Source
BOF Charging
At source
At building monitor
Controlled by baghouse
BOF Tapping
At source
At building monitor
Controlled by baghouse
Hot metal transfer
At source
At building monitor
BOF monitor (all sources)
Q-BOP melting and refining
Controlled by scrubber
Electric arc furnace
Melting and refining
Uncontrolled carbon
steel
Charging, tapping and
slagging
Uncontrolled emissions
escaping monitor
Melting, refining,
charging, tapping
and slagging
Uncontrolled
Alloy steel
Carbon steel
Controlled by: e
Building evacuation
to baghouse for
alloy steel
Direct shell
evacuation (plus
charging hood)
vented to common
baghouse for
carbon steel
Units
kg/Mg (Ib/ton) hot metal
kg/Mg (Ib/ton) steel
kg/Mg (Ib/ton) hot metal
kg/Mg (Ib/ton) steel
kg/Mg (Ib/ton) steel
kg/Mg (Ib/ton) steel
kg/Mg (Ib/ton) steel
kg/Mg (Ib/ton) steel
Emission Factor
0.3 (0.6)
0.071 (0.142)
0.0003 (0.0006)
0.46 (0.92)
0.145 (0.29)
0.0013 (0.0026)
0.095 (0.19)
0.028 (0.056)
0.25 (0.5)
0.028 (0.056)
19.0 (38.0)
0.7 (1.4)
5.65 (11.3)
25.0 (50.0)
0.15 (0.3)
0.0215 (0.043)
Emission
Factor
Rating
D
B
B
D
B
B
A
B
B
B
C
C
A
C
A
E
Particle
Size
Data
Yes
Yes
Yes
Yes
Yes
Yes
Yes
10/86
Metallurgical Industry
7.5-9
-------
TABLE 7.5-1 (Cont.)- PARTICULATE EMISSION FACTORS FOR IRON AND STEEL MILLS
Source
Open hearth furnace
Melting and refining
Uncontrolled
Controlled by ESP
Roof monitor
Teeming
Leaded steel
Uncontrolled (measured
at source)
Controlled by side draft hood
vented to baghouse
Unleaded steel
Uncontrolled (measured
at source)
Controlled by side draft hood
vented to baghouse
Machine scarfing
Uncontrolled
Controlled by ESP
Miscellaneous combustion sources^
Boiler, soaking pit and slab
reheat
Blast furnace gas8
Coke oven gasS
Units
kg/Mg (Ib/ton) steel
kg/Mg (Ib/ton) steel
kg/Mg (Ib/ton) metal
through scarfer
kg/109 J (lb/106 Btu)
Emission Factor
10.55 (21.1)
0.14 (0.28)
0.084 (0.168)
0.405 (0.81)
0.0019 (0.0038)
0.035 (0.07)
0.0008 (0.0016)
0.05 (0.1)
0.0115 (0.023)
f f
0.015 (0.035)
0.0052 (0.012)
Emission
Factor
Rating
D
D
C
A
A
A
A
B
A
D
D
Particle
Size
Data
Yes
Yes
aReference 3, except as noted.
''Typical of older furnaces with no controls, or for canopy hoods or total casthouse evacuation.
cTypical of large, new furnaces with local hoods and covered evaucated runners. Emissions are
higher than without capture systems because they are not diluted by outside environment.
Emission factor of 0.55 kg/Mg (1.09 Ib/ton) represents one torpedo car; 1.26 kg/Mg (2.53 Ib/ton) for
two torpedo cars, and 1.37 kg/Mg (2.74 Ib/ton) for three torpedo cars.
eBulldlng evacuation collects all process emissions, and direct shell evacuation collects only
aelting and refining emissions.
fpor various fuels, use the emission factors in Chapter 1 of this document. The emission factor
rating, for these fuels in boilers is A, and in soaking pits and slab reheat furnaces is D.
8Based on methane content and cleaned particulate loading.
7.5-10
EMISSION FACTORS
10/86
-------
TABLE 7.5-2. SIZE SPECIFIC EMISSION FACTORS
Source
Sintering
Windbox
Uncontrolled
Leaving grate
Controlled by wet
ESP
Controlled by
venturi scrubber
Controlled by
cyclone6
Controlled by
baghouse
Emission
Factor
Rating
D
C
C
C
C
Particle
Size yma
0.5
1.0
2.5
5.0
10
15
d
0.5
1,0
2.5
5.0
10
15
d
0.5
1.0
2.5
5.0
10
15
d
0.5
1.0
2.5
5.0
10
15
d
0.5
1.0
2.5
5.0
10.0
15.0
d
Cumulative
Mass % <
Stated size
4b
4
5
9
15
20C
100
18b
25
33
48
59b
69
100
55
75
89
93
96
98
100
25C
37b
52
64
74
80
100
3.0
9.0
27.0
47.0
69.0
79.0
100.0
Cumulative mass
emission factor
kg/Mg (Ib/ton)
0.22 (0.44)
0.22 (0.44)
0.28 (0.56)
0.50 (1.00)
0.83 (1.67)
1.11 (2.22)
5.56 (11.1)
0.015 (0.03)
0.021 (0.04)
0.028 (0.06)
0.041 (0.08)
0.050 (0.10)
0.059 (0.12)
0.085 (0.17)
0.129 (0.26)
0.176 (0.35)
0.209 (0.42)
0.219 (0.44)
0.226 (0.45)
0.230 (0.46)
0.235 (0.47)
0.13 (0.25)
0.19 (0.37)
0.26 (0.52)
0.32 (0.64)
0.37 (0.74)
0.40 (0.80)
0.5 (1.0)
0.005 (0.009)
0.014 (0.027)
0.041 (0.081)
0.071 (0.141)
0.104 (0.207)
0.119 (0.237)
0.15 (0.3)
10/86
Metallurgical Industry
7.5-11
-------
TABLE 7.5.2 (cont.) SIZE SPECIFIC EMISSION FACTORS
Source
Sinter discharge
(breaker and hot
screens) controlled
by baghouse
Blast furnace
Uncontrolled cast-
house emissions
Roof monitor^
Furnace with local
evacuation^
Hot metal
desulfurizationn
Uncontrolled
Hot metal
desulfurizationn
Controlled baghouse
Emission
Factor
Rating
C
C
C
E
D
Particle
Size yma
0.5
1.0
2.5
5.0
10
15
d
0.5
1.0
2.5
5.0
10
15
d
0.5
1.0
2.5
5.0
10
15
d
0.5
1.0
2.5
5.0
10
15
d
0.5
1.0
2.5
5.0
10
15
d
Cumulative
Mass % <
Stated size
2b
4
11
20
32b
42b
100
4
15
23
35
51
61
100
7C
9
15
20
24
26
100
j
2c
11
19
19
21
100
8
18
42
62
74
78
100
Cumulative mass
emission factor
kg/Mg (Ib/ton)
0.001 (0.002)
0.002 (0.004)
0.006 (0.011)
0.010 (0.020)
0.016 (0.032)
0.021 (0.042)
0.05 (0.1)
0.01 (0.02)
0.05 (0.09)
0.07 (0.14)
0.11 (0.21)
0.15 (0.31)
0.18 (0.37)
0.3 (0.6)
0.04 (0.09)
0.06 (0.12)
0.10 (0.20)
0.13 (0.26)
0.16 (0.31)
0.17 (0.34)
0.65 (1.3)
0.01 (0.02)
0.06 (0.12)
0.10 (0.22)
0.10 (0.22)
0.12 (0.23)
0.55 (1.09)
0.0004 (0.0007)
0.0009 (0.0016)
0.0019 (0.0038)
0.0028 (0.0056)
0.0033 (0.0067)
0.0035 (0.0070)
0.0045 (0.009)
7.5-12
EMISSION FACTORS
10/86
-------
TABLE 7.5-2 (cont.) SIZE SPECIFIC EMISSION FACTORS
Source
Basic oxygen furnace
Top blown furnace
melting and refining
controlled by closed
hood and vented to
scrubber
EOF Charging
At source^
Controlled by
baghouse
BOF Tapping
At source^
Emission
Factor
Rating
C
E
D
E
Particle
Size yma
0.5
1.0
2.5
5.0
10
15
d
0.5
1.0
2.5
5.0
10
15
d
0.5
1.0
2.5
5.0
10
15
d
0.5
1.0
2.5
5.0
10
15
d
Cumulative
Mass % <
Stated size
34
55
65
66
67
72c
100
8C
12
22
35
46
56
100
3
10
22
31
45
60
100
j
11
37
43
45
50
100
Cumulative mass
emission factor
kg/Mg (Ib/ton)
0.0012 (0.0023)
0.0019 (0.0037)
0.0022 (0.0044)
0.0022 (0.0045)
0.0023 (0.0046)
0.0024 (0.0049)
0.0034 (0.0068)
0.02 (0.05)
0.04 (0.07)
0.07 (0.13)
0.10 (0.21)
0.14 (0.28)
0.17 (0.34)
0.3 (0.6)
9.0xlO-6 1.8xlO-5
3.0x10-5 6.0x10-5
6.6x10-5 (0.0001)
9.3x10-5 (0.0002)
0.0001 (0.0003)
0.0002 (0.0004)
0.0003 (0.0006)
J j
0.05 (0.10)
0.17 (0.34)
0.20 (0.40)
0.21 (0.41)
0.23 (0.46)
0.46 (0.92)
10/86
Metallurgical Industry
7.5-13
-------
TABLE 7.5-2 (cont.) SIZE SPECIFIC EMISSION FACTORS
Source
BOF Tapping
Controlled by
baghouse
Q-BOP melting and
refining controlled
by scrubber
Emission
Factor
Rating
D
D
Electric arc furnace
melting and refin-
ing carbon steel
uncontrol ledm
Electric arc furnace
Melting, refining,
charging, tapping,
si agging
Controlled by
direct shell
evacuation (plus
charging hood)
vented to common
baghouse for
carbon steel0
D
E
Particle
Size ma
0.5
1.0
2.5
5.0
10
15
d
0.5
1.0
2.5
5.0
10
15
d
0.5
1.0
2.5
5.0
10
15
d
0.5
1.0
2.5
5.0
10
15
d
Cumulative
Mass % <
Stated size
4
7
16
22
30
40
100
45
52
56
58
68
85C
100
8
23
43
53
58
61
100
74b
74
74
74
76
80
100
Cumulative mass
emission factor
kg/Mg (Ib/ton)
5.2xlO-5 (0.0001)
0.0001 (0.0002)
0.0002 (0.0004)
0.0003 (0.0006)
0.0004 (0.0008)
0.0005 (0.0010)
0.0013 (0.0026)
0.013 (0.025)
0.015 (0.029)
0.016 (0.031)
0.016 (0.032)
0.019 (0.038)
0.024 (0.048)
0.028 (0.056)
1.52 (3.04)
4.37 (8.74)
8.17 (16.34)
10.07 (20.14)
11.02 (22.04)
11.59 (23.18)
19.0 (38.0)
0.0159 (0.0318)
0.0159 (0.0318)
0.0159 (0.0318)
0.0159 (0.0318)
0.0163 (0.0327)
0.0172 (0.0344)
0.0215 (0.043)
7.5-14
EMISSION FACTORS
10/86
-------
TABLE 7.5-2 (cont.) SIZE SPECIFIC EMISSION FACTORS
Source
Open hearth furnace
Melting and refining
Uncontrolled
Open Hearth Furnaces
Controlled by
ESPP
Emission
Factor
Rating
E
E
Particle
Size yma
0.5
1.0
2.5
5.0
10
15
d
0.5
1.0
2.5
5.0
10
15
d
Cumulative
Mass, % <
Stated size
lb
21
60
79
83
85C
100
10b
21
39
47
53b
56b
100
Cumulative mass
emission factor
kg/Mg (Ib/ton)
0.11 (0.21)
2.22 (4.43)
6.33 (12.66)
8.33 (16.67)
8.76 (17.51)
8.97 (17.94)
10.55 (21.1)
0.01 (0.02)
0.03 (0.06)
0.05 (0.10)
0.07 (0.13)
0.07 (0.15)
0.08 (0.16)
0.14 (0.28)
aParticle aerodynamic diameter micrometers (ym) as defined by Task Group on Lung
Dynamics. (Particle density = 1 gr/cm^).
^Interpolated data used to develop size distribution.
cExtrapolated, using engineering estimates.
dTotal particulate based on Method 5 total catch. See Table 7.5-1.
eAverage of various cyclone efficiencies.
^Total casthouse evacuation control system.
SEvacuation runner covers and local hood over taphole, typical of new state of
the art blast furnace technology.
nTorpedo ladle desulfurization with CaC£ and CaCOo.
JUnable to extrapolate because of insufficient data and/or curve exceeding limits,
"^-Doghouse type furnace enclosure using front and back sliding doors, totally
enclosing the furnace, with emissions vented to hoods.
mFull cycle emissions captured by canopy and side draft hoods.
nlnformation on control system not available.
PMay not be representative. Test outlet size distribution was larger than inlet
and may indicate reentrainment problem.
10/86
Metallurgical Industry
7.5-15
-------
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7.5-16
EMISSION FACTORS
10/86
-------
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10/86
Metallurgical Industry
7.5-17
-------
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TABLE 7.5-3. UNCONTROLLED CARBON MONOXIDE EMISSION FACTORS
FOR IRON AND STEEL MILLSa
EMISSION FACTOR RATING: C
Source
Sintering windbox^
Basic oxygen furnacec
Electric arc furnacec
kg/Mg
22
69
9
Ib/ton
44
138
18
aReference 6.
bkg/Mg (Ib/ton) of finished sinter.
Ckg/Mg (Ib/ton) of finished steel.
7.5.2.9 Open Dust Sources - Like process emission sources, open dust sources
contribute to the atmospheric particulate burden. Open dust sources include
vehicle traffic on paved and unpaved roads, raw material handling outside of
buildings and wind erosion from storage piles and exposed terrain. Vehicle
traffic consists of plant personnel and visitor vehicles, plant service
vehicles, and trucks handling raw materials, plant deliverables, steel pro-
ducts and waste materials. Raw materials are handled by clamshell buckets,
bucket/ladder conveyors, rotary railroad dumps, bottom railroad dumps, front
end loaders, truck dumps, and conveyor transfer stations, all of which disturb
the raw material and expose fines to the wind. Even fine materials resting on
flat areas or in storage piles are exposed and are subject to wind erosion. It
is not unusual to have several million tons of raw materials stored at a plant
and to have in the range of 10 to 100 acres of exposed area there.
Open dust source emission factors for iron and steel production are
presented in Table 7.5-4. These factors were determined through source testing
at various integrated iron and steel plants.
As an alternative to the single valued open dust emission factors
given in Table 7.5-4, empirically derived emission factor equations are pre-
sented in Section 11.2 of this document. Each equation was developed for a
source operation defined on the basis of a single dust generating mechanism
which crosses industry lines, such as vehicle traffic on unpaved roads. The
predictive equation explains much of the observed variance in measured emission
factors by relating emissions to parameters which characterize source conditions.
These parameters may be grouped into three categories: (1) measures of source
activity or energy expended (e. g., the speed and weight of a vehicle traveling
on an unpaved road), (2) properties of the material being disturbed (e. g., the
content of suspendible fines in the surface material on an unpaved road) and
(3) climatic parameters (e. g., number of precipitation free days per year, when
emissions tend to a maximum).^
7.5-19
Metallurgical Industry
10/86
-------
TABLE 7.5-4. UNCONTROLLED PARTICULATE EMISSION FACTORS FOR
OPEN DUST SOURCES AT IRON AND STEEL MILLS3
Operation
Continuous drop
Conveyor transfer station
sinterc
Pile formation stacker pellet orec
Lunp orec
Coald
Batch drop
Front end loader/truck0
High silt slag
Low silt slag
Vehicle travel on unpaved roads
Light duty vehicle3
Medium duty vehicled
Heavy duty vehicle"1
Vehicle travel on paved roads
Light/heavy vehicle mixc
Emissions by particle size range
(aerodynamic diameter)
£ 30 um
13
0.026
1.2
0.0024
0.15
0.00030
0.055
0.00011
13
0.026
4.4
0.0088
0.51
1.8
2.1
7.3
3.9
14
0.22
0.78
£ 15 um
9.0
0.018
0.75
0.0015
0.095
0.00019
0.034
0.000068
8.5
0.017
2.9
0.0058
0.37
1.3
1.5
5.2
2.7
9.7
0.16
0.58
£ 10 um
6.5
0.013
0.55
0.0011
0.075
0.00015
0.026
0.000052
6.5
0.013
2.2
0.0043
0.28
1.0
1.2
4.1
2.1
7.6
0.12
0.44
£ 5 um
4.2
0.0084
0.32
0.00064
0.040
0.000081
0.014
0.000028
4.0
0.0080
1.4
0.0028
0.18
0.64
0.70
2.5
1.4
4.8
0.079
,0.28
< 2.5 um
2.3
0.0046
0.17
0.00034
0.022
0.000043
0.0075
0.000015
2.3
0.0046
0.80
0.0016
0.10
0.36
0.42
1.5
0.76
2.7
0.042
0.15
Unitsb
g/Mg
Ib/ton
g/Mg
Ib/ton
g/Mg
Ib/ton
g/Mg
Ib/ton
8/Mg
Ib/ton
g/Mg
Ib/ton
Kg/VKT
Ib/VMT
Kg/VKT
Ib/VMT
Kg/VKT
Ib/VMT
Kg/VKT
Ib/VMT
Emission
Factor
Rating
D
D
B
B
C
c
E
E
C
C
C
C
C
C
G
C
B
B
C
C
aPredictive emission factor equations are generally preferred over these single values emission factors.
Predictive emission factors estimates are presented in Chapter 11, Section 11.2. VKT • Vehicle kilometer
traveled. VMT - Vehicle mile traveled.
bUnlts/unlt of material transferred or units/unit of distance traveled.
cReference 4. Interpolation to other particle sizes will be approximate.
^Reference 5. Interpolation to other particle sizes will be approximate.
7.5-20
EMISSION FACTORS
10/86
-------
Because the predictive equations allow for emission factor adjustment to
specific source conditions, the equations should be used in place of the fac-
tors in Table 7.5-4, if emission estimates for sources in a specific iron and
steel facility are needed. However, the generally higher quality ratings
assigned to the equations are applicable only if (1) reliable values of correc-
tion parameters have been determined for the specific sources of interest and
(2) the correction parameter values lie within the ranges tested in developing
the equations. Section 11.2 lists measured properties of aggregate process
materials and road surface materials in the iron and steel industry, which can
be used to estimate correction parameter values for the predictive emission
factor equations, in the event that site specific values are not available.
Use of mean correction parameter values from Section 11.2 reduces the
quality ratings of the emission factor equation by one level.
References for Section 7.5
1. J. Jeffery and J. Vay, Source Category Report for the Iron and Steel
Industry, EPA-600/7-86-036, U.S. Environmental Protection Agency,
Research Triangle Park, NC, October 1986.
2. H. E. McGannon, ed., The Making, and Shaping and Treating of Steel, U. S.
Steel Corporation, Pittsburgh, PA, 1971.
3. T. A. Cuscino, Jr., Particulate Emission Factors Applicable to the Iron and
Steel Industry, EPA-450/4-79-028, U. S. Environmental Protection Agency,
Research Triangle Park, NC, September 1979.
4. R. Bohn, et al., Fugitive Emissions from Integrated Iron and Steel Plants,
EPA-600/2-78-050, U. S. Environmental Protection Agency, Research Triangle
Park, NC, March 1978.
5. C. Cowherd, Jr., et al., Iron and Steel Plant Open Source Fugitive Emis-
jsion Evaluation, EPA-600/2-79-103, U. S. Environmental Protection Agency,
Research Triangle Park, NC, May 1979.
6. Control Techniques for Carbon Monoxide Emissions from Stationary Sources,
AP-65, U. S. Department of Health, Education and Welfare, Washington, DC,
March 1970.
10/86 Metallurgical Industry 7.5-21
-------
7.6 PRIMARY LEAD SMELTING
7.6.1 Process Description
Lead is usually found naturally as a sulfide ore containing small amounts
of copper, iron, zinc and other trace elements. It is usually concentrated at
the mine from an ore of 3 to 8 percent lead to a concentrate of 55 to 70 percent
lead, containing from 13 to 19 weight percent free and uncombined sulfur.
Processing involves three major steps, sintering, reduction and refining.
A typical diagram of the production of lead metal from ore concentrate,
with particle and gaseous emission sources indicated, is shown in Figure 7.6-1.
Sintering - Sinter is produced by a sinter machine, a continuous steel
pallet conveyor belt moved by gears and sprockets. Each pallet consists of
perforated or slotted grates, beneath which are wind boxes connected to fans to
provide a draft, either up or down, through the moving sinter charge. Except
for draft direction, all machines are similar in design, construction and
operation.
The primary reactions occurring during the sintering process
are autogenous, occurring at approximately 1000°C (1800°F):
2PbS + 302 > 2PbO + 2S02 (1)
PbS + 202 > PbS04 (2)
Operating experience has shown that system operation and product quality
are optimum when the sulfur content of the sinter charge is from 5 to 7 weight
percent. To maintain this desired sulfur content, sulfide free fluxes such as
silica and limestone, plus large amounts of recycled sinter and smelter resi-
dues, are added to the mix. The quality of the product sinter is usually
determined by its Ritter Index hardness, which is inversely proportional to the
sulfur content. Hard quality sinter (low sulfur content) is preferred, because
it resists crushing during discharge from the sinter machine. Undersize sinter,
usually from insufficient desulfurization, is recycled for further processing.
Of the two kinds of sintering machines, the updraft design is superior for
many reasons. First, the sinter bed is more permeable (and hence can be larg-
er), thereby permitting a higher production rate than with a downdraft machine
of similar dimensions. Secondly, the small amounts of elemental lead that form
during sintering will solidify at their point of formation in updraft machines,
but, in downdraft operation, the metal flows down and collects on the grates or
at the bottom of the sinter charge, thus causing increased pressure drop and
attendant reduced blower capacity. The updraft system also can produce sinter
10/86 Metallurgical Industry 7.6-1
-------
0
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7.6-2
EMISSION FACTORS
10/86
-------
of higher lead content, and it requires less maintenance than the downdraft
machine. Finally, and most important from an air pollution control standpoint,
updraft sintering can produce a single strong sulfur dioxide (802) effluent
stream from the operation, by the use of weak gas recirculation. This permits
more efficient and economical use of control methods such as sulfuric acid
recovery devices.
Reduction - Lead reduction is carried out in a blast furnace, which basic-
ally is a water jacketed shaft furnac.e supported by a refractory base. Tuyeres,
through which combustion air is admitted under pressure, are located near the
bottom and are evenly spaced on either side of the furnace.
The furnace is charged with a mixture of sinter (80 to 90 percent of
charge), metallurgical coke (8 to 14 percent of charge), and other materials
such as limestone, silica, litharge, slag forming constituents, and various
recycled and cleanup materials. In the furnace, the sinter is reduced to lead
bullion by Reactions 3 through 7.
C + 02 — » C02 (3)
C + C02— > 2CO (4)
PbO + CO— » Pb + C02 (5)
2PbO + PbS— » 3Pb + S02 (6)
PbS04 + PbS — » 2Pb + 2S02 (7)
Carbon monoxide and heat required for reduction are supplied by the
combustion of coke. Most of the impurities are eliminated in the slag. Solid
products from the blast furnace generally separate into four layers, speiss
(the lightest material, basically arsenic and antimony), matte (copper sulfide
and other metal sulfides), slag (primarily silicates), and lead bullion. The
first three layers are called slag, which is continually collected from the
furnace and is either processed at the smelter for its metal content or shipped
to treatment facilities.
Sulfur oxides are also generated in blast furnaces from small quantities
of residual lead sulfide and lead sulfates in the sinter feed. The quantity of
these emissions is a function not only of the sinter's residual sulfur content,
but also of the sulfur captured by copper and other impurities in the slag.
Rough lead bullion from the blast furnace usually requires preliminary
treatment (dressing) in kettles before undergoing refining operations. First,
the bullion is cooled to 370° to 430°C (700 to 800°F). Copper and small amounts
of sulfur, arsenic, antimony and nickel collect on the surface as a dross and
are removed from the solution. This dross, in turn, is treated in a reverber-
atory furnace to concentrate the copper and other metal impurities before being
routed to copper smelters for their eventual recovery. To enhance copper re-
moval, drossed lead bullion is treated by adding sulfur bearing material, zinc,
and/or aluminum, lowering the copper content to approximately 0.01 percent.
10/86 Metallurgical Industry 7.6-3
-------
Refining - The third and final phase in smelting, the refining of the
bullion in cast iron kettles, occurs in five steps:
- Removal of antimony, tin and arsenic
- Removal of precious metals by Parke's Process, in which zinc combines
with gold and silver to form an insoluble intermetallic at operating
temperatures
- Vacuum removal of zinc
- Removal of bismuth by the Betterson Process, which is the addition of
calcium and magnesium to form an insoluble compound with the bismuth
that is skimmed from the kettle
- Removal of remaining traces of metal impurities by addition of NaOH and
NaN03
The final refined lead, commonly from 99.990 to 99.999 percent pure, is
then cast into 45 kilogram (100 pound) pigs for shipment.
7.6.2 Emissions And Controlsl~2
Each of the three major lead smelting process steps generates substantial
quantities of 862 and/or particulate.
Nearly 85 percent of the sulfur present in the lead ore concentrate is
eliminated in the sintering operation. In handling process offgases, either a
single weak stream is taken from the machine hood at less than 2 percent SC>2,
or two streams are taken, a strong stream (5 to 7 percent 862) from the feed end
of the machine and a weak stream (less than 0.5 percent 802) from the discharge
end. Single stream operation has been used if there is little or no market for
recovered sulfur, so that the uncontrolled, weak SC>2 stream is emitted to the
atmosphere. When sulfur removal is required, however, dual stream operation is
preferred. The strong stream is sent to a sulfuric acid plant, and the weak
stream is vented to the atmosphere after removal of particulate.
When dual gas stream operation is used with updraft sinter machines, the
weak gas stream can be recirculated through the bed to mix with the strong gas
stream, resulting in a single stream with an 802 concentration of about 6
percent. This technique decreases machine production capacity, but it does
permit a more convenient and economical recovery of the 802 by sulfuric acid
plants and other control methods.
Without weak gas recirculation, the end portion of the sinter machine
acts as a cooling zone for the sinter and, consequently, assists in the reduc-
tion of dust formation during product discharge and screening. However, when
recirculation is used, sinter is usually discharged at 400° to 500°C (745° to
950°F), with an attendant increase in particulate. Methods to reduce these
dust quantities include recirculatng offgases through the sinter bed (to use
the bed as a filter) or ducting gases from the sinter machine discharge through
a particulate collection device and then to the atmosphere. Because reaction
activity has ceased in the discharge area, these gases contain little 802.
7.6-4 EMISSION FACTORS 10/86
-------
Particulate emissions from sinter machines range from 5 to 20 percent of
the concentrated ore feed. In terms of product weight, a typical emission is
estimated to be 106.5 kilograms per megagram (213 pounds per ton) of lead
produced. This value, and other particulate and SC>2 factors, appears in Table
7.6-1.
Typical material balances from domestic lead smelters indicate that about
15 percent of the sulfur in the ore concentrate fed to the sinter machine is
eliminated in the blast furnace. However, only half of this amount, about 7
percent of the total sulfur in the ore, is emitted as
The remainder is captured by the slag. The concentration of this S02
stream can vary from 1.4 to 7.2 grams per cubic meter (500 to 2500 parts per
million) by volume , depending on the amount of dilution air injected to oxidize
the carbon monoxide and to cool the stream before baghouse particulate removal.
Particulate emissions from blast furnaces contain many different kinds of
material, including a range of lead oxides, quartz, limestone, iron pyrites,
iron-lime-silicate slag, arsenic, and other metallic compounds associated with
lead ores. These particles readily agglomerate and are primarily submicron in
size, difficult to wet, and cohesive. They will bridge and arch in hoppers.
On average, this dust loading is quite substantial, as is shown in Table 7.6-1.
Minor quantities of particulates are generated by ore crushing and mater-
ials handling operations, and these emission factors are also presented in
Table 7.6-1.
TABLE 7.6-1. UNCONTROLLED EMISSION FACTORS FOR PRIMARY LEAD SMELTING3
EMISSION FACTOR RATING: B
Particulate
Process
kg/Mg
Ib/ton
Sulfur dioxide
kg/Mg Ib/ton
Ore crushing^
Sintering (updraft)c
Blast furnace*!
Dross reverberatory furnace6
Materials handling^
1.0
106.5
180.5
10.0
2.5
2.0
213.0
361.0
20.0
5.0
1_
275.0
22.5
Neg
~
_
550.0
45.0
Neg
—
aBased on quantity of lead produced. Dash = no data. Neg = negligible.
bReference 2. Based on quantity of ore crushed. Estimated from similar
nonferrous metals processing.
cReferences 1, 5-7.
dReferences 1-2, 8.
eReference 2.
^Reference 2. Based on quantity of materials handled.
10/86
Metallurgical Industry
7.6-5
-------
Table 7.6-2 and Figure 7.6-2 present size specific emission factors for
the controlled emissions from a primary lead blast furnace. No other size
distribution data can be located for point sources within a primary lead pro-
cessing plant. Lacking definitive data, size distributions for uncontrolled
assuming that the uncontrolled size distributions for the sinter machine and
blast furnace are the same as for fugitive emissions from these sources.
Tables 7.6-3 through 7.6-7 and Figures 7.6-3 through 7.6-7 present size
specific emission factors for the fugitive emissions generated at a primary lead
processing plant. The size distribution of fugitive emissions at a primary lead
processing plant is fairly uniform, with approximately 79 percent of these
emissions at less than 2.5 micrometers. Fugitive emissions less than 0.625
micrometers in size make up approximately half of all fugitive emissions, except
from the sinter machine, where they constitute about 73 percent.
Emission factors for total fugitive particulate from primary lead smelting
processes are presented in Table 7.6-8. The factors are based on a combination
of engineering estimates, test data from plants currently operating, and test
data from plants no longer operating. The values should be used with caution,
because of the reported difficulty in accurately measuring the source emission
rates.
Emission controls on lead smelter operations are for particulate and
sulfur dioxide. The most commonly employed high efficiency particulate control
devices are fabric filters and electrostatic precipitators (ESP), which often
follow centrifugal collectors and tubular coolers (pseudogravity collectors).
Three of the six lead smelters presently operating in the United States use
single absorption sulfuric acid plants to control SC>2 emissions from sinter
machines and, occasionally, from blast furnaces. Single stage plants can
attain sulfur oxide levels of 5.7 grams per cubic meter (2000 parts per mill-
ion), and dual stage plants can attain levels of 1.6 grams per cubic meter (550
parts per million). Typical efficiencies of dual stage sulfuric acid plants in
removing sulfur oxides can exceed 99 percent. Other technically feasible S02
control methods are elemental sulfur recovery plants and dimethylaniline (DMA)
and ammonia absorption processes. These methods and their representative
control efficiencies are given in Table 7.6-9.
7.6-6 EMISSION FACTORS 10/86
-------
TABLE 7.6-2. LEAD EMISSION FACTORS AND PARTICLE SIZE DISTRIBUTION FOR
BAGHOUSE CONTROLLED BLAST FURNACE FLUE GASESa
EMISSION FACTOR RATING: C
Particle
u
size"
(urn)
15
10
6
2.5
1.25
1.00
0.625
Total
_, , . 0,
uumu.Lat iv e mass /o
< stated size
98
86.3
71.8
56.7
54.1
53.6
52.9
100.0
Cumulative em
kg/Mg
1.17
1.03
0.86
0.68
0.65
0.64
0.63
1.20
ission factors
Ib/ton
2.34
2.06
1.72
1.36
1.29
1.28
1.27
2.39
aReference 9.
"Expressed as aerodynamic equivalent diameter.
_L
I I
I
1.20 "S
1.00
0.!
0.625 1.0 1.25 2.5 6.0 10.0 15.0
Particle size (pm)
o
o
s_
o
0.60 °
U~l
c/1
Figure 7.6-2.
Size specific emission factors for baghouse
controlled blast furnace.
10/86
Metallurgical Industry
7.6-7
-------
TABLE 7.6-3 UNCONTROLLED FUGITIVE EMISSION FACTORS AND PARTICLE
SIZE DISTRIBUTION FOR LEAD ORE STORAGE3
EMISSION FACTOR RATING: D
Particle
a-i ~ Ob
(urn)
15
10
6
2.5
1.25
1.00
0.625
Total
< stated size
91
86
80.5
69.0
61.0
59.0
54.5
100.0
Cumulative
kg/Mg
0.011
0.010
0.010
0.009
0.008
0.007
0.007
0.012
emission factors
Ib/ton
0.023
0.021
0.020
0.017
0.015
0.015
0.013
0.025
aReference 10.
^Expressed as aerodynamic equivalent diameter.
T3
OJ
O
<_1
c
o
rC
c
O
0.011 -
0.010
0.009
0.008
L5 0.007
I
0.625 1.0 1.25 2.5 6.0 10.0 15.0
Particle size (vim)
Figure 7.6-3. Size specific uncontrolled fugitive emission factors
for lead ore storage.
7.6-8
EMISSION FACTORS
10/86
-------
TABLE 7.6-4. UNCONTROLLED LEAD FUGITIVE EMISSION FACTORS AND
PARTICLE SIZE DISTRIBUTION FOR SINTER MACHINE3
EMISSION FACTOR RATING: D
Particle
sizeb
(urn)
15
10
6
2.5
1.25
1.00
0.625
Total
Cumulative emission factors
Cumulative mass %
< stated size
99
98
94.1
87.3
81.1
78.4
73.2
100.0
kg/Mg
0.10
0.10
0.09
0.08
0.07
0.07
0.07
0.10
Ib/ton
0.19
0.19
0.17
0.16
0.15
0.15
0.14
0.19
aReference 10.
"Expressed as aerodynamic equivalent diameter,
10/86
-a
OJ
c
o
u
o
4->
O
l/l
1/1
0.10
0.09
0.08
0.07
_L
0.625 1.0 1.25 2.5 6.0 10.0 15.0
Particle size (ym)
Figure 7.6-4.
Size specific fugitive emission factors for
uncontrolled sinter machine.
Metallurgical Industry
7.6-9
-------
TABLE 7.6-5. UNCONTROLLED LEAD FUGITIVE EMISSION FACTORS AND PARTICLE
SIZE DISTRIBUTION FOR BLAST FURNACE8
EMISSION FACTOR RATING: D
Particle
a-i ~ ob
(urn)
15
10
6
2.5
1.25
1.00
0.625
Total
Cumulative emission factors
^ -IA.J m»no 9f
< stated size
94
89
83.5
73.8
65.0
61.8
54.4
100.0
kg/Mg
0.11
0.11
0.10
0.09
0.08
0.07
0.06
0.12
Ib/ton
0.23
0.21
0.20
0.17
0.15
0.15
0.13
0.24
aReference 10.
^Expressed as aerodynamic equivalent diameter.
0.11
o 0.10
T3
QJ
O
u
0.09
0.08
o 0.07
0.06
l/l
1/1
0.05
_L
I
_L
0.625 1.0 1.5 2.5 6.0 10.0 15.0
Particle size (ym)
Figure 7.6-5. Size specific lead fugitive emission factors
for uncontrolled blast furnace.
7.6-10
EMISSION FACTORS
10/86
-------
TABLE 7.6-6.
UNCONTROLLED LEAD FUGITIVE EMISSION FACTORS AND PARTICLE
SIZE DISTRIBUTION FOR DROSS KETTLEa
EMISSION FACTOR RATING: D
Particle
size"
(urn)
15
10
6
2.5
1.25
1.00
0.625
Total
Cumulative mass %
< stated size
99
98
92.5
83.3
71.3
66.0
51.0
100.0
Cumulative
kg/Mg
0.18
0.18
0.17
0.15
0.13
0.12
0.09
0.18
emission factors
Ib/ton
0.36
0.35
0.33
0.30
0.26
0.24
0.18
0.36
aReference 10.
^Expressed as aerodynamic equivalent diameter.
T3
OJ
O
O
c
3
en
en
O
rtJ
c
O
0.18
0.15
0.12
0.09
0.06
j l
Figure 7.6-6
0.625 1.0 1.25 2.5 6.0 10.0 15.0
Particle size (vim)
Size specific lead fugitive emission factors for
uncontrolled dross kettle.
10/86
Metallurgical Industry
7.6-11
-------
TABLE 7.6-7. UNCONTROLLED LEAD FUGITIVE EMISSION FACTORS AND PARTICLE
SIZE DISTRIBUTION FOR REVERBERATING FURNACE3
EMISSION FACTOR RATING: D
aReference 10.
"Expressed as aerodynamic equivalent diameter.
Particle
Q 1 <7 0b
(urn)
15
10
6
2.5
1.25
1.00
0.625
Total
< stated size
99
98
92.3
80.8
67.5
61.8
49.3
100.0
Cumulative
kg/Mg
0.24
0.24
0.22
0.20
0.16
0.15
0.12
0.24
emission factors
Ib/ton
0.49
0.48
0.45
0.39
0.33
0.30
0.24
0.49
0.25
0.20
0.15
en
SC
CD
u
T,
M-
5 0.10
I
I I
I
I
0.625 1.0 1.25 2.5 6.0 10.0 15.0
Particle size
Figure 7.6-7,
Size specific lead fugitive emission factors for
uncontrolled reverberating furnace.
7.6-12
EMISSION FACTORS
10/86
-------
TABLE 7.6-8. UNCONTROLLED FUGITIVE EMISSION FACTORS FOR
PRIMARY LEAD SMELTING PROCESSESSa»b
Emission
points
Ore storage^
Ore mixing and
pelletizing (crushing)
Car charging (conveyor loading,
transfer) of sinter
Sinter machine
Machine leakage0
Sinter return handling
Machine discharge,
sinter crushing, screening0
Sinter transfer to dump area
Sinter product dump area
Total buildingb
Blast furnace
Lead pouring to ladle, transferring
slag pouring0
Slag coolingd
Zinc fuming furnace vents
Dross kettleb
Reverberatory furnace leakage^
Silver retort building
Lead casting
Parti
kg/Mg
0.012
1.13
0.25
0.34
4.50
0.75
0.10
0.005
0.10
0.47
0.24
2.30
0.24
1.50
0.90
0.44
culate
Ib/ton
0.025
2.26
0.50
0.68
9.00
1.50
0.20
0.01
0.19
0.93
0.47
4.60
0.48
3.00
1.80
0.87
Emission
17 r\ n f- rt •*•
r etc L u L
Rating
D
E
E
E
E
E
E
E
D
D
E
E
D
D
E
E
aExpressed in units/end product lead produced, except sinter operations,
which are units/sinter handled, transferred, charged.
^Reference 10.
°References 12-13. Engineering judgment, using steel sinter machine
leakage emission factor.
^Reference 2. Engineering judgment, estimated to be half the magnitude
of lead pouring and ladling operations.
10/86
Metallurgical Industry
7.6-13
-------
TABLE 7.6-9. TYPICAL CONTROL DEVICE EFFICIENCIES IN
PRIMARY LEAD SMELTING OPERATIONS
Efficiency range (%)
method Particulate Sulfur dioxide
Centrifugal collector3
Electrostatic precipitator3
Fabric filter3
Tubular cooler (associated with waste
heat boiler)3
Sulfuric acid plant (single contact)"'0
Sulfuric acid plant (dual contact)b>d
Elemental sulfur recovery plantb»e
Dimethylaniline (DMA) absorption process^'
Ammonia absorption processD>f
80 - 90
95 - 99
95 - 99
70 - 80
99.5 - 99.9
99.5 - 99.9
NA
c NA
NA
NA
NA
NA
NA
96 - 97
96 - 99.9
90
95 - 99
92 - 95
3Reference 2. NA = not available.
^Reference 1.
GHigh particulate control efficiency from action of acid plant
gas cleaning systems. With S02 inlet concentrations 5-7%, typical
outlet emission levels are 5.7 g/m3 (2000 ppm) for single contact,
1.4 g/m3 (500 ppm) for dual contact.
^Collection efficiency for a two stage uncontrolled Glaus type plant.
See Section 5.18, Sulfur Recovery.
S02 inlet concentrations 4-6 %, typical outlet emission levels
are from 1.4-8.6 g/m3 (500-3000 ppm).
S02 inlet concentrations of 1.5-2.5 %, typical outlet emission
level is 3.4 g/m3 (1200 ppm).
References for Section 7.6
1. C. Darvin and F. Porter, Background Information for New Source Performance
Standards; Primary Copper, Zinc and Lead Smelters, Volume I, EPA-450/2-
74-002a, U. S. Environmental Protection Agency, Research Triangle Park,
NC, October 1974.
2. A. E. Vandergrift, et al., Particulate Pollutant System Study, Volume I;
Mass Emissions, APTD-0743, U. S. Environmental Protection Agency, Research
Triangle Park, NC, May 1971.
3. A. Worcester and D. H. Beilstein, "The State of the Art: Lead Recovery",
presented at the 10th Annual Meeting of the Metallurgical Society, AIME,
New York, NY, March 1971.
7.6-14 EMISSION FACTORS 10/86
-------
4. Environmental Assessment of the Domestic Primary Copper, Lead and Zinc
Industries (Prepublication), EPA Contract No. 68-03-2537, Pedco Environ-
mental, Cincinnati, OH, October 1978.
5. T. J. Jacobs, Visit to St. Joe Minerals Corporation Lead Smelter,
Herculaneum, MO, Office Of Air Quality Planning And Standards, U. S.
Environmental Protection Agency, Research Triangle Park, NC, October 21,
1971.
6. T. J. Jacobs, Visit to Amax Lead Company, Boss, MO, Office Of Air Quality
Planning And Standards, U. S. Environmental Protection Agency, Research
Triangle Park, NC, October 28, 1971.
7. Written communication from R. B. Paul, American Smelting and Refining Co.,
Glover, MO, to Regional Administrator, U. S. Environmental Protection
Agency, Kansas City, MO, April 3, 1973.
8. Emission Test No. 72-MM-14, Office Of Air Quality Planning And Standards,
U. S. Environmental Protection Agency, Research Triangle Park, NC, May
1972.
9. Source Sampling Report; Emissions from Lead Smelter at American Smelting
and Refining Company, Glover, MO, July 1973 to July 23, 1973, EMB-73-
PLD-1, Office Of Air Quality Planning And Standards, U. S. Environmental
Protection Agency, Research Triangle Park, NC, August 1974.
10. Sample Fugitive Lead Emissions From Two Primary Lead Smelters, EPA-450/3-
77-031, U. S. Environmental Protection Agency, Research Triangle Park, NC,
October 1977.
11. Silver Valley/Bunker Hill Smelter Environmental Investigation (Interim
Report), Contract No. 68-02-1343, Pedco Environmental, Durham, NC,
February 1975.
12. R. E. Iversen, Meeting with U. S. Environmental Protection Agency and AISI
on Steel Facility Emission Factors, Office Of Air Quality Planning And
Standards, U. S. Environmental Protection Agency, Research Triangle Park,
NC, June 1976.
13. G. E. Spreight, "Best Practicable Means in the Iron and Steel Industry",
The Chemical Engineer, London, England, ZH: 132-139, March 1973.
14. Control Techniques for Lead Air Emissions, EPA-450/2-77-012, U. S. Envi-
ronmental Protection Agency, Research Triangle Park, NC, January 1978.
10/86 Metallurgical Industry 7.6-15
-------
7.7 PRIMARY ZINC SMELTING
7.7.1 Process Descriptionl-2
Zinc is found primarily as the sulfide ore sphalerite (ZnS). Its common
coproduct ores are lead and copper. Metal impurities commonly associated with
ZnS are cadmium (up to 2 percent) and minor quantities of germanium, gallium,
indium and thalium. Zinc ores typically contain from 3 to 11 percent zinc.
Some ores containing as little as 2 percent are recovered. Concentration at
the mine brings this to 49 to 54 percent zinc, with approximately 31 percent
free and uncorabined sulfur.
Zinc ores are processed into metallic slab zinc by two basic processes.
Four of the five domestic U. S. zinc smelting facilities use the electrolytic
process, and one plant uses a pyrometallurgical smelting process typical of the
primary nonferrous smelting industry. A general diagram of the industry is
presented in Figure 7.7-1.
Electrolytic processing involves four major steps, roasting, leaching,
purification and electrolysis, details of which follow.
Pyrometallurigical processing involves three major steps, roasting (as
above), sintering and retorting.
Roasting is a process common to both electrolytic and pyrometallurgical
processing. Calcine is produced by the roasting reactions in any one of three
different types of roasters, multiple hearth, suspension, or fluidized bed.
Multiple hearth roasters are the oldest type used in the United States, while
fluidized bed roasters are the most modern. The primary zinc roasting reaction
occurs between 640° and 1000°C (1300° and 1800°F), depending on the type of
roaster used, and is as follows:
2ZnS + 302 > 2ZnO + 2SO2 (1)
In a multiple hearth roaster, the concentrate is blown through a series of
nine or more hearths stacked inside a brick lined cylindrical column. As the
feed concentrate drops through the furnace, it is first dried by the hot gases
passing through the hearths and then oxidized to produce calcine. The reactions
are slow and can only be sustained by the addition of fuel.
In a suspension roaster, the feed is blown into a combustion chamber very
similar to that of a pulverized coal furnace. Additional grinding, beyond that
required for a multiple hearth furnace, is normally required to assure that
heat transfer to the material is sufficiently rapid for the desulfurization and
oxidation reactions to occur in the furnace chamber. Hearths at the bottom of
the roaster capture the larger particles, which require additional time within
the furnace to complete the desulfurization reaction.
10/86 Metallurgical Industry 7.7-1
-------
CO
CO
CD
O
O
M
O.
-------
In a fluidized bed roaster, finely ground sulfide concentrates are suspend-
ed and oxidized within a pneumatically supported feedstock bed. This achieves
the lowest sulfur content calcine of the three roaster designs.
Suspension and fluidized bed roasters are superior to the multiple hearth
for several reasons. Although they emit more uncontrolled particulate, their
reaction rates are much faster, allowing greater process rates. Also, the
sulfur dioxide (802) content of the effluent streams of these two types of
roasters is significantly higher, thus permitting more efficient and economical
use of acid plants to control S02 emissions.
Leaching is the first step of electrolytic reduction, in which the zinc
oxide reacts to form aqueous zinc sulfate in an electrolyte solution containing
sulfuric acid.
ZnO + H9SO, -> Zn+2(aq) + SO, 2(aq) + H90 (2)
Single and double leach methods can be used, although the former exhibits
excessive sulfuric acid losses and poor zinc recovery. In double leaching, the
calcine is first leached in a neutral or slightly alkaline solution. The
readily soluble sulfates from the calcine dissolve, but only a portion of the
zinc oxide enters the solution. The calcine is then leached in the acidic
electrolysis recycle electrolyte. The zinc oxide is dissolved through Reaction
2, as are many of the impurities, especially iron. The electrolyte is neutral-
ized by this process, and it serves as the leach solution for the first stage
of the calcine leaching. This recycling also serves as the first stage of
refining, since much of the dissolved iron precipitates out of the solution.
Variations on this basic procedure include the use of progressively stronger
and hotter acid baths to bring as much of the zinc as possible into solution.
Purification is a process in which a variety of reagents are added to the
zinc laden electrolyte to force impurities to precipitate. The solid precipi-
tates are separated from the solution by filtration. The techniques used are
among the most advanced industrial applications of inorganic solution chemistry.
Processes vary from smelter to smelter, and the details are proprietary and
often patented. Metallic impurities, such as arsenic, antimony, cobalt, german-
ium, nickel and thallium, interfere severely with the electrolyte deposition of
zinc, and their final concentrations are limited to less than 0.05 milligrams
per liter (4 x 10"? pounds per gallon).
Electrolysis takes place in tanks, or cells, containing a number of closely
spaced rectangular metal plates acting as anodes (made of lead with 0.75 to 1.0
percent silver) and as cathodes (made of aluminum). A series of three major
reactions occurs within the electrolysis cells:
10/86 Metallurgical Industry 7.7-3
-------
H2S04
2H20 » 4H+(aq) + 4e~ + 02 (3)
anode
cathode
2Zn+2 + 4e- •» 2Zn (4)
4H+(aq) + 2S0~2(aq) •>• 2HS0 (5)
Oxygen gas is released at the anode, metallic zinc is deposited at the
cathode, and sulfuric acid is regenerated within the electrolyte.
Electrolytic zinc smelters contain a large number of cells, often several
hundred. A portion of the electrical energy released in these cells dissipates
as heat. The electrolyte is continuously circulated through cooling towers,
both to lower its temperature and to concentrate the electrolyte through the
evaporation of water. Periodically, each cell is shut down and the zinc is
removed from the plates.
The final stage of electrolytic zinc smelting is the melting and casting
of the cathode zinc into small slabs, 27 kilograms (60 pounds), or large slabs,
640 to 1100 kilograms (1400 to 2400 pounds).
Sintering is the first stage of the pyrometallurgical reduction of zinc
oxide to slab zinc. Sintering removes lead and cadmium impurities by volatil-
ization and produces an agglomerated permeable mass suitable for feed to re-
torting furnaces. Downdraft sintering machines of the Dwight-Lloyd type are
used in the industry. Grate pallets are joined to form a continuous conveyor
system. Combustion air is drawn down through the grate pallets and is exhausted
to a particulate control system. The feed is a mixture of calcine, recycled
sinter and coke or coal fuel. The low boiling point oxides of lead and cadmium
are volatilized from the sinter bed and are recovered in the particulate control
system.
In retorting, because of the low boiling point of metallic zinc, 906°C
(1663°F), reduction and purification of zinc bearing minerals can be accom-
plished to a greater extent than with most minerals. The sintered zinc oxide
feed is brought into high temperature reducing atmosphere of 900° to 1499°C
(1650° to 2600°F). Under these conditions, the zinc oxide is simultaneously
reduced and volatilized to gaseous zinc:
ZnO + CO-» Zn(vapor) + C02 (6)
Carbon monoxide regeneration also occurs:
C02 + C-> 2CO (7)
7.7-4 EMISSION FACTORS 10/86
-------
The zinc vapor and carbon monoxide produced pass from the main furnace to a
condenser, for zinc recovery by bubbling through a molten zinc bath.
Retorting furnaces can be heated either externally by combustion flames or
internally by electric resistance heating. The latter approach, electrothermic
reduction, is the only method currently practiced in the United States, and it
has greater thermal efficiency than-do external heating methods. In a retort
furnace, preheated coke and sinter, silica and miscellaneous zinc bearing
materials are fed continuously into the top of the furnace. Feed coke serves
as the principle electrical conductor, producing heat, and it also provides the
carbon monoxide required for zinc oxide reduction. Further purification steps
can be performed on the molten metal collected in the condenser. The molten
zinc finally is cast into small slabs 27 kilograms (60 pounds), or the large
slabs, 640 to 1000 kilograms (1400 to 2400 pounds).
Each of the two zinc smelting processes generates emissions along the
various process steps. Although the electrolytic reduction process emits less
particulate than does pyrometallurgical reduction, significant quantities of
acid mists are generated by electrolytic production steps. No data are current-
ly available to quantify the significance of these emissions.
Nearly 90 percent of the potential S02 emissions from zinc ores is released
in roasters. Concentrations of S02 in the exhaust gases vary with the roaster
type, but they are sufficiently high to allow recovery in an acid plant.
Typical S(>2 concentrations for multiple hearth, suspension, and fluidized bed
roasters are 4.5 to 6.5 percent, 10 to 13 percent, and 7 to 12 percent, respe-
ctively. Additional S02 is emitted from the sinter plant, the quantity depend-
ing on the sulfur content of the calcine feedstock. The S02 concentration of
sinter plant exhaust gases ranges from 0.1 to 2.4 percent. No sulfur controls
are used on this exhaust stream. Extensive desulfurization before electro-
thermic retorting results in practically no S02 emissions from these devices.
The majority of particulate emissions in the primary zinc smelting industry
is generated in the ore concentrate roasters. Depending on the type of roaster
used, emissions range from 3.6 to 70 percent of the concentrate feed. When
expressed in terms of zinc production, emissions are estimated to be 133 kilo-
grams per megagram (266 pounds per ton) for a multiple hearth roaster, 1000
kilograms per megagram (2000 pounds per ton) for a fluidized bed roaster,
expressed in terms of zinc production. Particulate emission controls are
generally required for the economical operation of a roaster, with cyclones and
electrostatic precipitators (ESP) the primary methods used. No data are avail-
able for controlled particulate emissions from a roasting plant.
Controlled and uncontrolled emission factors for point sources within a
zinc smelting plant appear in Table 7.7-1. Sinter plant emission factors
should be applied carefully, because the data source is different from the only
plant currently in operation in the United States, although the technology is
identical. Additional data have been obtained for a vertical retort, although
no examples of this type of plant are operating in the United States. Particu-
late factors also have been developed for uncontrolled emissions from an elec-
tric retort and the electrolytic process.
10/86 Metallurgical Industry 7.7-5
-------
Fugitive emission factors have been estimated for the zinc smelting indus-
try and are presented in Table 7.7-2. These emission factors are based on
similar operations in the steel, lead and copper industries.
TABLE 7.7-1. PARTICULATE EMISSION FACTORS FOR
PRIMARY SLAB ZINC PROCESSING3
Process
Roasting
Multiple hearthb
Suspension0
Fluidized bedd
Sinter plant
Uncontrolled6
With cyclone^
With cyclone
and ESPf
Emission
Uncontrolled Factor
kg/Mg
113
1000
1083
62.5
NA
NA
IXCIl.-l.llg
Ib/ton
227 E
2000 E
2167 E
125 E
NA
NA
Emission
Controlled Factor
— — — — Kating
kg/Mg Ib/ton
4 8 E
24.1 48.2 D
8.25 16.5 D
Vertical retortS
Electric retort*1
Electrolytic
processJ
7.15
10.0
3.3
14.3
20.0
6.6
D
E
E
aBased on quantity of slab zinc produced. NA = not applicable. Dash = no
data.
^References 3-5. Averaged from an estimated 10% of feed released as
particulate emissions, zinc production rate at 60% of roaster feed rate,
and other estimates.
cReferences 3-5. Based on an average 60% of feed released as particulate
emission and a zinc production rate at 60% of roaster feed rate. Controlled
emissions based on 20% drop out in waste heat boiler and 99.5% drop out in
cyclone and ESP.
^References 3,6. Based on an average 65% of feed released as particulate
emissions and a zinc production rate of 60% of roaster feed rate.
eReference 3. Based on unspecified industrial source data.
fReference 7. Data not necessarily compatible with uncontrolled emissions.
SReference 7.
"Reference 2. Based on unspecified industrial source data.
^Reference 13.
7.7-*
EMISSION FACTORS
10/86
-------
TABLE 7.7-2. UNCONTROLLED FUGITIVE PARTICULATE EMISSION FACTORS FOR
PRIMARY SLAB ZINC PROCESSING3
EMISSION FACTOR RATING: E
Process
Emission factor^
(kg/Mg) (Ib/ton)
Roasting
Sinter plantc
Wind box.
Discharge and screens
Retort buildingd
Casting6
Negligible
0.12 - 0.55
0.28 - 1.22
1.0 - 2.0
1.26
Negligible
0.24 - 1.10
0.56 - 2.44
2.0 - 4.0
2.52
aBased on quantity of slab zinc produced, except as noted.
bReference 8.
cFrom steel industry operations for which there are emission
factors. Based on quantity of sinter produced.
^From lead industry operations.
eFrom copper industry operations.
References for Section 7.7
1. V. Anthony Cammerota, Jr., "Mineral Facts and Problems: 1980", Zinc,
Bureau Of Mines, U. S. Department Of Interior, Washington, DC, 1980.
2. Environmental Assessment of the Domestic Primary Copper, Lead and Zinc
Industries, EPA-600/2-82-066, U. S. Environmental Protection Agency,
Cincinnati, OH, October 1978.
3. Particulate Pollutant System Study, Volume I; Mass Emissions, APTD-0743,
U. S. Environmental Protection Agency, Research Triangle Park, NC, May
1971.
4. G. Sallee, personal communication anent Reference 3, Midwest Research
Institute, Kansas City, MO, June 1970.
5. Systems Study for Control of Emissions in the Primary Nonferrous Smelting
Industry, Volume I, APTD-1280, U. S. Environmental Protection Agency,
Research Triangle Park, NC, June 1969.
6. Encyclopedia of Chemical Technology, John Wiley and Sons, Inc., New York,
NY, 1967.
10/86
Metallurgical Industry
7.7-7
-------
7. Robert B. Jacko and David W. Nevendorf, "Trace Metal Emission Test Results
from a Number of Industrial and Municipal Point Sources", Journal of the
Air Pollution Control Association, 2J_(10):989-994, October 1977.
8. Technical Guidance for Control of Industrial Process Fugitive Particulate
Emissions, EPA-450/3-77-010, U. S. Environmental Protection Agency,
Research Triangle Park, NC, March 1977.
9. Linda J. Duncan and Edwin L. Keitz, "Hazardous Particulate Pollution from
Typical Operations in the Primary Non-ferrous Smelting Industry", presented
at the 67th Annual Meeting of the Air Pollution Control Association,
Denver, CO, June 9-13, 1974.
10. Environmental Assessment Data Systems, FPEIS Test Series No. 3, U. S.
Environmental Protection Agency, Research Triangle Park, NC.
11. Environmental Assessment Data Systems, FPEIS Test Series No. 44, U. S.
Environmental Protection Agency, Research Triangle Park, NC.
12. R. E. Lund, et al., "Josephtown Electrothermic Zinc Smelter of St. Joe
Minerals Corporation", AIME Symposium on Lead and Zinc, Volume II, 1970.
13. Background Information For New Source Performance Standards; Primary
Copper, Lead and Zinc Smelters, EPA-450/2-74-002a, U. S. Environmental
Protection Agency, Research Triangle Park, NC October 1974.
7.7-8 EMISSION FACTORS 10/86
-------
7.8 SECONDARY ALUMINUM OPERATIONS
7.8.1 General
Secondary aluminum operations involve the cleaning, melting, refining,
alloying and pouring of aluminum recovered from scrap, foundry returns and
dross. The processes used to convert scrap aluminum to secondary aluminum
products such as lightweight metal alloys for industrial castings and ingots
are presented in Figure 7.8-1. Production involves two general classes of
operations, scrap treatment and smelting/refining.
Scrap treatment involves receiving, sorting and processing scrap to
remove contaminants and to prepare the material for smelting. Processes
based on mechanical, pyrometallurgical and hydrometallurgical techniques are
used, and those employed are selected to suit the type of scrap processed.
The smelting/refining operation generally involves the following steps:
o charging o mixing
o melting o demagging
o fluxing o degassing
o alloying o skimming
o pouring
All of these steps may be involved at each facility, with process distinctions
being in the furnace type used and in emission characteristics. However, as
with scrap treatment, not all of these steps are necessarily incorporated
into the operations at a particular plant. Some steps may be combined or
reordered, depending on furnace design, scrap quality, process inputs and
product specifications.
Scrap treatment - Purchased aluminum scrap undergoes inspection upon delivery.
Clean scrap requiring no treatment is transported to storage or is charged
directly into the smelting furnace. The bulk of the scrap, however, must be
manually sorted as it passes along a steel belt conveyor. Free iron, stainless
steel, zinc, brass and oversized materials are removed. The sorted scrap
then goes to appropriate scrap treating processes or is charged directly to
the smelting furnace.
Sorted scrap is conveyed to a ring crusher or hammer mill, where the
material is shredded and crushed, with the iron torn away from the aluminum.
The crushed material is passed over vibrating screens to remove dirt and
fines, and tramp iron is removed by magnetic drums and/or belt separators.
Baling equipment compacts bulky aluminum scrap into 1x2 meter (3x6 foot)
bales.
Pure aluminum cable with steel reinforcement or insulation is cut by
alligator type shears and granulated or further reduced in hammer mills, to
separate the iron core and the plastic coating from the aluminum. Magnetic
processing accomplishes iron removal, and air classification separates the
insulation.
10/86 Metallurgical Industry 7.8-1
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Borings and turnings, in most cases, are treated to remove cutting oils,
greases, moisture and free iron. The processing steps involved are (a)
crushing in hammer mills or ring crushers, (b) volatilizing the moisture and
organics in a gas or oil fired rotary dryer, (c) screening the dried chips to
remove aluminum fines, (d) removing iron magnetically and (e) storing the
clean dried borings in tote boxes.
Aluminum can be recovered from the hot dross discharged from a refining
furnace by batch fluxing with a salt/cryolite mixture in a mechanically ro-
tated, refractory lined barrel furnace. The metal is tapped periodically
through a hole in its base. Secondary aluminum recovery from cold dross and
other residues from primary aluminum plants is carried out by means of this
batch fluxing in a rotary furnace. In the dry milling process, cold aluminum
laden dross and other residues are processed by milling, screening and con-
centrating to obtain a product containing at least 60-70 percent aluminum.
Ball, rod or hammer mills can be used to reduce oxides and nonmetallics to
fine powders. Separation of dirt and other unrecoverables from the metal is
achieved by screening, air classification and/or magnetic separation.
Leaching involves (a) wet milling, (b) screening, (c) drying and (d)
magnetic separation to remove fluxing salts and other non-recoverables from
drosses, skimmings and slags. First, the raw material is fed into a long
rotating drum or an attrition or ball mill where soluble contaminants are
leached. The washed material is then screened to remove fines and dissolved
salts and is dried and passed through a magnetic separator to remove ferrous
materials. The nonmagnetics then are stored or charged directly to the
smelting furnace.
In the roasting process, carbonaceous materials associated with aluminum
foil are charred and then separated from the metal product.
Sweating is a pyrometallurgical process used to recover aluminum from
high iron content scrap. Open flame reverberatory furnaces may be used.
Separation is accomplished as aluminum and other low melting constituents
melt and trickle down the hearth, through a grate and into air cooled molds
or collecting pots. This product is termed "sweated pig". The higher melting
materials, including iron, brass and oxidation products formed during the
sweating process, are periodically removed from the furnace.
Smelting/refining - In reverberatory (chlorine) operations, reverberatory
furnaces are commonly used to convert clean sorted scrap, sweated pigs or
some untreated scrap to specification ingots, shot or hot metal. The scrap
is first charged to the furnace by some mechancial means, often through
charging wells designed to permit introduction of chips and light scrap below
the surface of a previously melted charge ("heel"). Batch processing is
generally practiced for alloy ingot production, and continuous feeding and
pouring are generally used for products having less strict specifications.
Cover fluxes are used to prevent air contact with and consequent oxidation
of the melt. Solvent fluxes react with nonmetallics such as burned coating
residues and dirt to form insolubles which float to the surface as part of
the slag.
10/86 Metallurgical Industry 7.8-3
-------
Alloying agents are charged through the forewell in amounts determined
by product specifications. Injection of nitrogen or other inert gases into
the molten metal can be used to aid in raising dissolved gases (typically
hydrogen) and intermixed solids to the surface.
Demagging reduces the magnesium content of the molten charge from
approximately 0.3 to 0.5 percent (typical scrap value) to about 0.1 percent
(typical product line alloy specification). When demagging with chlorine
gas, chlorine is injected under pressure through carbon lances to react with
magnesium and aluminum as it bubbles to the surface. Other chlorinating
agents, or fluxes, are sometimes used such as anhydrous aluminum chloride or
chlorinated organics.
In the skimming step, contaminated semisolid fluxes (dross, slag or
skimmings) are ladled from the surface of the melt and removed through the
forewell. The melt is then cooled before pouring.
The reverberatory (fluorine) process is similar to the reverberatory
(chlorine) smelting/refining process, except that aluminum fluoride (Al?3)
is employed in the demagging step instead of chlorine. The AlF^ reacts with
magnesium to produce molten metallic aluminum and solid magnesium fluoride
salt which floats to the surface of the molten aluminum and is skimmed off.
The crucible smelting/refining process is used to melt small batches of
aluminum scrap, generally limited to 500 kg (1000 Ib) or less. The metal
treating process steps are essentially the same as those of reverberatory
furnaces.
The induction smelting/refining process is designed to produce hardeners
by blending pure aluminum and hardening agents in an electric induction
furnace. The process steps include charging scrap to the furnace, melting,
adding and blending the hardening agent, skimming, pouring and casting into
notched bars.
7.8.2 Emissions and Controls1
Table 7.8-1 presents emission factors for the principal emission sources
in secondary aluminum operations. Although each step in scrap treatment and
smelting/refining is a potential source of emissions, emissions from most of
the scrap treatment operations are either not characterized here or represent
small amounts of pollutants. Table 7.8-2 presents particle size distributions
and corresponding emission factors for uncontrolled chlorine demagging and
metal refining in secondary aluminum reverberatory furnaces.
Crushing/screening and shredding/classifying produce small amounts of
metallic and nonmetallic particulate. Baling operations produce particulate
emissions, primarily dirt and alumina dust resulting from aluminum oxidation.
These processing steps are normally uncontrolled.
Burning/drying operations emit a wide range of pollutants, particulate
matter as well as VOCs. Afterburners are used generally to convert unburned
VOCs to C02 and 1^0. Other gases potentially present, depending on the compo-
sition of the organic contaminants, include chlorides, fluorides and sulfur
oxides. Oxidized aluminum fines blown out of the dryer by the combustion
7.8-4 EMISSION FACTORS 10/86
-------
TABLE 7.8-1. PARTICULATE EMISSION FACTORS FOR SECONDARY
ALUMINUM OPERATIONS3
Uncontrolled Baghouse
Operation
Sweating furnace''
Smelting
Crucible furnace''
Reverberatory furnace0
Chlorine demagging
kg/Mg
7.25
0.95
2.15
500
Ib/ton kg/Mg Ib/ton
14.5 1.65 3.3
1.9
4.3 0.65e 1.3e
1000 25 50
Electrostatic Emission
precipltator factor
kg/Mg Ib/ton rating
- - C
C
0.65 1.3 B
- B
aReference 2. Emission factors for sweating and smelting furnaces expressed as units per unit
weight of metal processed. For chlorine demagging, emission factor 1s kg/Mg (Ib/ton) of
chlorine used.
"Based on averages of two source tests.
^Uncontrolled, based on averages of ten source tests. Standard deviation of uncontrolled
emission factor Is 1.75 kg/Mg (3.5 Ib/ton), that of controlled factor is 0.15 kg/Mg (0.3 Ib/ton).
''Based on average of ten source tests. Standard deviation of uncontrolled emission factor is
215 kg/Mg (430 Ib/ton); of controlled factor, 18 kg/Mg (36 Ib/ton).
eThis factor may be lower if a coated baghouse is used.
gases comprise particulate emissions. Wet scrubbers are sometimes used in
place of afterburners.
Mechanically generated dust from the rotating barrel dross furnace
constitutes the main air emission of hot dross processing. Some fumes are
produced from the fluxing reactions. Fugitive emissions are controlled by
enclosing the barrel in a hood system and by ducting the stream to a bag-
house. Furnace offgas emissions, mainly fluxing salt fume, are controlled
by a venturi scrubber.
In dry milling, large amounts of dust are generated from the crushing,
milling, screening, air classification and materials transfer steps. Leach-
ing operations may produce particulate emissions during drying. Emissions
from roasting are particulates from the charring of carbonaceous materials.
Emissions from sweating furnaces vary with the feed scrap composition.
Smoke may result from incomplete combustion of organic contaminants (e.g.,
rubber, oil and grease, plastics, paint, cardboard, paper) which may be
present. Fumes can result from oxidation of magnesium and zinc contaminants
and from fluxes in recovered drosses and skims.
Atmospheric emissions from reverberatory (chlorine) smelting/refining
represent a significant fraction of the total particulate and gaseous eff-
luents generated in the secondary aluminum industry. Typical furnace eff-
luent gases contain combustion products, chlorine, hydrogen chloride and
metal chlorides of zinc, magnesium and aluminum, aluminum oxide and various
metals and metal compounds, depending on the quality of scrap charged.
Emissions from reverberatory (fluorine) smelting/refining are similar
to those from reverberatory (chlorine) smelting/refining. The use of A1F3
10/86 Metallurgical Industry 7.8-5
-------
Particle Size Distributions and Size Specific Emission
Factors for Uncontrolled Reverberatory Furnaces
UNCONTROLLED
Weight percent
Emission factor
parcicle diameter,
UNCONTROLLED
—•- Weight percent
Emission factor
Pare!cle diameter , urn
Figure 7.8-2. Chlorine demagging.
Figure 7.8-3. Refining.
TABLE 7.8-2. PARTICLE SIZE DISTRIBUTIONS AND SIZE SPECIFIC EMISSION FACTORS
FOR UNCONTROLLED REVERBERATORY FURNACES IN SECONDARY ALUMINUM
OPERATIONS3
SIZE-SPECIFIC EMISSION FACTOR RATING: D
Particle size distribution13
Aerodynamic
particle
diameter, urn
2.5
6.0
10.0
Chlorine
demagging
19.8
36.9
53.2
Refining
50.0
53.4
60.0
Size specific emission
factor0,
Chlorine
demagging
99.5
184.5
266.0
kg/Mg
Refining
1.08
1.15
1.30
aReferences 4-5.
"Cumulative weight % < aerodynamic particle diameter, um.
GSize specific emission factor = total particulate emission factor x
particle size distribution, %/100. From Table 7.8-1, total particulate
emission factor for chlorine demagging is 500 kg/Mg chlorine used, and
for refining, 2.15 kg/Mg aluminum processed.
7.8-6
EMISSION FACTORS
10/86
-------
rather than chlorine in the demagging step reduces demagging emissions.
Fluorides are emitted as gaseous fluorides (hydrogen fluoride, aluminum and
magnesium fluoride vapors, and silicon tetrafluoride) or as dusts. Venturi
scrubbers are usually used for fluoride emission control.
References for Section 7.8
1. W. M. Coltharp, et al., Multimedia Environmental Assessment of the
Secondary Nonferrous Metal Industry, Draft Final Report, 2 vols.,
EPA Contract No. 68-02-1319, Radian Corporation, Austin, TX, June 1976.
2. W. F. Hammond and S. M. Weiss, Unpublished report on air contaminant
emissions from metallurgical operations in Los Angeles County, Los
Angeles County Air Pollution Control District, July 1964.
3. R. A. Baker, et al., Evaluation of a Coated Baghouse at a Secondary
Aluminum Smelter, EPA Contract No. 68-02-1402, Environmental Science
and Engineering, Inc., Gainesville, FL, October 1976.
4. Emission test data from Environmental Assessment Data Systems, Fine Par-
ticle Emission Information System (FPEIS), Series Report No. 231, U. S.
Environmental Protection Agency, Research Triangle Park, NC, June 1983.
5. Environmental Assessment Data Systems, op. cit., Series Report No. 331.
6. J. A. Danielson, (ed.), Air Pollution Engineering Manual, 2nd Ed., AP-40,
U. S. Environmental Protection Agency, Research Triangle Park, NC, May
1973. Out of Print.
7. E. J. Petkus, Precoated Baghouse Control for Secondary Aluminum Smelting,
presented at the 71st Annual Meeting of the Air Pollution Control Associ-
ation, Houston, TX, June 1978.
10/86 Metallurgical Industry 7.8-7
-------
7.10 GRAY IRON FOUNDRIES
7.10.1 General 1-5
I*
Gray iron foundries produce gray iron castings from scrap iron, pig iron
and foundry returns by melting, alloying and molding. The production of gray
iron castings involves a number of integrated steps, which are outlined in
Figures 7.10-1 and 7.10-2. The four major production steps are raw materials
handling and preparation, metal melting, mold and core production, and casting
and finishing.
Raw Materials Handling And Preparation - Handling operations include re-
ceiving, unloading, storing and conveying of all raw materials for both furnace
charging and mold and core preparation. The major groups of raw materials re-
quired for furnace charging are metallics, fluxes and fuels. Metallic raw
materials include pig iron, iron and steel scrap, foundry returns and metal
turnings. Fluxes include carbonates (limestone, dolomite), fluoride (fluor-
spar), and carbide compounds (calcium carbide).^ Fuels include coal, oil,
natural gas and coke. Coal, oil and natural gas are used to fire reverberatory
furnaces. Coke, a derivative of coal, is used as a fuel in cupola furnaces.
Carbon electrodes are required for electric arc furnaces.
As shown in Figures 7.10-1 and 7.10-2, the raw materials, metallics and
fluxes are added to the melting furnaces directly. For electric induction
furnaces, however, the scrap metal added to the furnace charge must first be
pretreated to remove any grease and/or oil, which can cause explosions. Scrap
metals may be degreased with solvents, by centrifugation, or by preheating to
combust the organics.
In addition to the raw materials used to produce the molten metal, a
variety of materials is needed to prepare the sand cores and molds that form
the iron castings. Virgin sand, recycled sand and chemical additives are
combined in a sand handling system typically comprising receiving areas, con-
veyors, storage silos and bins, mixers (sand mullers), core and mold making
machines, shakeout grates, sand cleaners, and sand screening.
Raw materials are received in ships, railroad cars, trucks and containers,
then transferred by truck, loaders and conveyors to both open piles and enclosed
storage areas. When needed, the raw materials are transferred from storage to
process areas by similar means.
Metal Melting - The furnace charge includes metallics, fluxes and fuels.
The composition of the charge depends upon the specific metal characteristics
required. Table 7.10-1 lists the different chemical compositions of typical
irons produced. The three most common furnaces used in the gray iron foundry
industry are cupolas, electric arc, and electric induction furnaces.
The cupola, which is the major type of furnace used in industry today, is
typically a vertical cylindrical steel shell with either a refractory lined or
water cooled inner wall. Refractory linings usually consist of silica brick,
or dolomite or magnesium brick. Water cooled linings, which involve circulating
10/86 Metallurgical Industry 7.10-1
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Metallurgical Industry
7.10-3
-------
TABLE 7.10-1.
CHEMICAL COMPOSITION OF FERROUS CASTINGS
BY PERCENTAGE
Element
Gray iron
Malleable iron
(as white iron)
Ductile irona
Steel
Carbon
Silicon
Manganese
Sulfur
Phosphorus
2.5 -
1.0 -
0.40 -
0.05 -
0.05 -
4
3
1
0
1
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3
1
0
0
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3.0 - 4.0
1.4 - 2.0
0.5 - 0.8
<0.12
<0.15
<2.0b
0.2 - 0
0.5 - 1
<0.06
<0.05
.8
.0
aNecessary chemistry also includes 0.01 - 1.0% Mg.
^Steels are further classified by carbon content: low carbon, <0.20%;
medium carbon, 0.20 - 0.50%; high carbon, >0.50%.
water around the outer steel shell, are used to protect the furnace wall from
interior temperatures. The cupola is charged at the top with alternate layers
of coke, metallics and fluxes.2 The cupola is the only furnace type to use
coke as a fuel; combustion air used to burn the coke is introduced through
tuyeres located at the base of the cupola.2 Cupolas use either cold blast air,
air introduced at ambient temperature, or hot blast air with a regenerative
system which utilizes heat from the cupola exhaust gases to preheat the com-
bustion air.^ Iron is melted by the burning coke and flows down the cupola.
As the melt proceeds, new charges are added at the top. The flux removes non-
metallic impurities in the iron to form slag. Both the molten iron and the slag
are removed through tap holes at the bottom of the cupola. Periodically, the
heat period is completed, and the bottom of the cupola is opened to remove the
remaining unburned material. Cupola capacities range from 1.0 to 27 megagrams
per hour (1 to 30 tons per hour), with a few larger units approach-1'ng 90 mega-
grams per hour (100 tons per hour). Larger furnaces operate continuously and
are inspected and cleaned at the end of each week or melting cycle.
Electric arc furnaces (EAF) are large, welded steel cylindrical vessels
equipped with a removable roof through which three retractable carbon electrodes
are inserted. The electrodes are lowered through the roof of the furnace and
are energized by three phase alternating current, creating arcs that melt the
metallic charge with their heat. Additional heat is produced by the resistance
of the metal between the arc paths. The most common method of charging an
electric arc furnace is by removing the roof and introducing the raw materials
directly. Alternative methods include introducing the charge through a chute
cut in the roof or through a side charging door in the furnace shell . Once
the melting cycle is complete, the carbon electrodes are raised, and the roof
is removed. The vessel is tilted, and the molten iron is poured into a ladle.
Electric arc furnace capacities range from 0.23 to 59 megagrams (0.25 to 65
tons). Nine to 11 pounds of electrode are consumed per ton of metal melted.
7.10-4
EMISSION FACTORS
10/86
-------
Electric induction furnaces are either cylindrical or cup shaped refractory
lined vessels that are surrounded by electrical coils which, when energized with
high frequency alternating current, produce a fluctuating electromagnetic field
to heat the metal charge. For safety reasons, the scrap metal added to the
furnace charge is cleaned and heated before being introduced into the furnace.
Any oil or moisture on the scrap could cause an explosion in the furnace.
Induction furnaces are kept closed except when charging, skimming and tapping.
The molten metal is tapped by tilting and pouring through a hole in the side of
the vessel. Induction furnaces also may be used for metal refining in conjunc-
tion with melting in other furnaces and for holding and superheating the molten
metal before pouring (casting).
The basic melting process operations are 1) furnace charging, in which
metal, scrap, alloys, carbon, and flux are added to the furnace; 2) melting,
during which the furnace remains closed; 3) backcharging, which involves the
addition of more metal and alloys, as needed; 4) refining and treating, during
which the chemical composition is adjusted to meet product specifications; 5)
slag removing; and 6) tapping molten metal into a ladle or directly into molds.
Mold And Core Production - Molds are forms used to shape the exterior of
castings. Cores are molded sand shapes used to make the internal voids in cast-
ings. Cores are made by mixing sand with organic binders, molding the sand into
a core, and baking the core in an oven. Molds are prepared of a mixture of wet
sand, clay and organic additives to make the mold shapes, which are usually
dried with hot air. Cold setting binders are being used more frequently in both
core and mold production. The green sand mold, the most common type, uses
moist sand mixed with 4 to 6 percent clay (bentonite) for bonding. The mixture
is 4 to 5 percent water content. Added to the mixture, to prevent casting
defects from sand expansion when the hot metal is poured, is about 5 percent
organic material, such as sea coal (a pulverized high volatility bituminous
coal), wood flour, oat hulls, pitch or similar organic matter.
Common types of gray iron cores are:
- Oil core, with typical sand binder percents of 1.0 core oil, 1.0 cereal,
and 0 to 1 pitch or resin. Cured by oven baking at 205 to 315°C (400 to
600°F), for 1 to 2 hours.
- Shell core, with sand binder typically 3 to 5 percent phenolic and/or
urea formaldehyde, with hexamine activator. Cured as a thin layer on a
heated metal pattern at 205 to 315°C (400 to 600°F), for 1 to 3 minutes.
- Hot box core, with sand binder typically 3 to 5 percent furan resin, with
phosphoric acid activator. Cured as a solid core in a heated metal pat-
tern at 205 to 315°C (400 to 600°F), for 0.5 to 1.5 minutes.
- Cold set core, with typical sand binder percents of 3 to 5 furan resin,
with phosphoric acid activator; or 1 to 2 core oil, with phosphoric acid
activator. Hardens in the core box. Cured for 0.5 to 3 hours.
- Cold box core, with sand binder typically 1 to 3 percent of each of two
resins, activated by a nitrogen diluted gas. Hardens when the green core
is gassed in the box with polyisocyanate in air. Cured for 10 to 30
seconds.
10/86 Metallurgical Industry 7.10-5
-------
Used sand from castings shakeout is recycled to the sand preparation area
and cleaned to remove any clay or carbonaceous buildup. The sand is then
screened and reused to make new molds. Because of process losses and discard
of a certain amount of sand because of contamination, makeup sand is added.
Casting And Finishing - After the melting process, molten metal is tapped
from the furnace. Molten iron produced in cupolas is tapped from the bottom of
the furnace into a trough, thence into a ladle. Iron produced in electric arc
and induction furnaces is poured directly into a ladle by tilting the furnace.
At this point, the molten iron may be treated with magnesium to produce ductile
iron. The magnesium reacts with the molten iron to nodularize the carbon in
the molten metal, giving the iron less brittleness. At times, the molten metal
may be inoculated with graphite to adjust carbon content. The treated molten
iron is then ladled into molds and transported to a cooling area, where it
solidifies in the mold and is allowed to cool further before separation (shake-
out) from the mold and core sand. In larger, more mechanized foundries, the
molds are conveyed automatically through a cooling tunnel. In simpler found-
ries, molds are placed on an open floor space, and the molten iron is poured
into the molds and allowed to cool partially. Then the molds are placed on a
vibrating grid to shake the mold and core sand loose from the casting. In the
simpler foundries, molds, core sand and castings are separated manually, and
the sand from the mold and core is then returned to the sand handling area.
When castings have cooled, any unwanted appendages, such as spurs, gates,
and risers, are removed. These appendages are removed with oxygen torch,
abrasive band saw, or friction cutting tools. Hand hammers may be used, in
less mechanized foundries, to knock the appendages off. After this, the cast-
ings are subjected to abrasive blast cleaning and/or tumbling to remove any
remaining mold sand or scale.
Another step in the metal melting process involves removing the slag in the
furnace through a tapping hole or door. Since the slag is lighter than molten
iron, it remains atop the molten iron and can be raked or poured out of cupola
furnaces through the slag hole located above the level of the molten iron.
Electric arc and induction furnaces are tilted backwards, and their slag is
removed through a slag door.
7.10.2 Emissions And Controls
Emissions from the raw materials handling operations are fugitive particu-
late generated from the receiving, unloading, storage and conveying of raw mate-
rials. These emissions are controlled by enclosing the major emission points
(e. g., conveyor belt transfer points) and routing air from the enclosures
through fabric filters or wet collectors. Figure 7.10-2 shows emission points
and types of emissions from a typical foundry.
Scrap preparation with heat will emit smoke, organic compounds and carbon
monoxide, and scrap preparation with solvent degreasers will emit organics.
Catalytic incinerators and afterburners can control about 95 percent of organic
and carbon monoxide emissions. (See Section 4.6, Solvent Degreasing.)
Emissions released from the melting furnaces include particulate matter,
carbon monoxide, organic compounds, sulfur dioxide, nitrogen oxides and small
quantities of chloride and fluoride compounds. The particulates, chlorides and
7.10-6 EMISSION FACTORS 10/86
-------
fluorides are generated from incomplete combustion of coke, carbon additives,
flux additions, and dirt and scale on the scrap charge. Organic material on
the scrap, the consumption of coke in the furnace, and the furnace temperature
all affect the amount of carbon monoxide generated. Sulfur dioxide emissions,
characteristic of cupola furnaces, are attributable to sulfur in the coke.
Fine particulate fumes emitted from the melting furnaces come from the
condensation of volatilized metal and metal oxides.
During melting in an electric arc furnace, particulate emissions are gen-
erated by the vaporization of iron and the transformation of mineral additives.
These emissions occur as metallic and mineral oxides. Carbon monoxide emissions
come from the combustion of the graphite lost from the electrodes and the carbon
added to the charge. Hydrocarbons may come from vaporization and partial
combustion of any oil remaining on the scrap iron added to the furnace charge.
The highest concentrations of furnace emissions occur during charging,
backcharging, alloying, slag removal, and tapping operations, because furnace
lids and doors are opened. Generally, these emissions escape into the furnace
building or are collected and vented through roof openings. Emission controls
for melting and refining operations usually involve venting the furnace gases
and fumes directly to a control device. Controls for fugitive furnace
emissions include canopy hoods or special hoods near the furnace doors and
tapping hoods to capture emissions and route them to emission control systems.
High energy scrubbers and baghouses (fabric filters) are used to control
particulate emissions from cupolas and electric arc furnaces in this country.
When properly designed and maintained, these control devices can achieve respec-
tive efficiencies of 95 and 98 percent. A cupola with such controls typically
has an afterburner with up to 95 percent efficiency, located in the furnace
stack, to oxidize carbon monoxide and to burn organic fumes, tars and oils.
Reducing these contaminants protects the particulate control device from poss-
ible plugging and explosion. Because induction furnaces emit negligible amounts
of hydrocarbon and carbon monoxide emissions, and relatively little particulate,
they are usually uncontrolled.2
The major pollutant emitted in mold and core production operations is par-
ticulate from sand reclaiming, sand preparation, sand mixing with binders and
additives, and mold and core forming. Organics, carbon monoxide and particulate
are emitted from core baking, and organic emissions from mold drying. Baghouses
and high energy scrubbers generally are used to control particulate from mold
and core production. Afterburners and catalytic incinerators can be used to
control organics and carbon monoxide emissions.
Particulate emissions are generated during the treatment and inoculation
of molten iron before pouring. For example, during the addition of magnesium
to molten metal to produce ductile iron, the reaction between the magnesium and
molten iron is very violent, accompanied by emissions of magnesium oxides and
metallic fumes. Emissions from pouring consist of hot metal fumes, and carbon
monoxide, organic compounds and particulate evolved from the mold and core
materials contacting the molten iron. Emissions from pouring normally are
captured by a collection system and vented, either controlled or uncontrolled,
to the atmosphere. Emissions continue as the molds cool. A significant quan-
tity of particulate is also generated during the casting shakeout operation.
These fugitive emissions must be captured, and they usually are controlled by
10/86 Metallurgical Industry 7.10-7
-------
either high energy scrubbers or bag filters.
Finishing operations emit large, coarse particles during the removal of
burrs, risers and gates, and during shot blast cleaning. These emissions are
easily controlled by cyclones and baghouses.
Emission factors for total particulate from gray iron furnaces are pre-
sented in Table 7.10-2, and emission factors for gaseous and lead pollutants
are given in Table 7.10-3. Tables 7.10-4 and 7.10-5, respectively, give factors
for ancillary process operations and fugitive sources and for specific particle
sizes. Particle size factors and distributions are presented also in Figures
7.10-3 through 7.10-8.
TABLE 7.10-2. EMISSION FACTORS FOR GRAY IRON FURNACES3
Process
Cupola
Electric arc furnace
Electric induction
furnace
Reverberatory
Control
device
Uncontrolled^3
Scrubber0
Venturi scrubber"
Electrostatic
precipitator6
Baghouse*
Single wet cap§
Impingement scrubber^
High energy scrubber^
Uncontrolled'1
BaghouseJ
Uncontrolled^
Baghouse111
Uncontrolled11
Baghousem
Total Emission
particulate Factor
Rating
kg/Mg Ib/ton
6.9
1.6
1.5
0.7
0.3
4.0
2.5
0.4
6.3
0.2
0.5
0.1
1.1
0.1
13.8
3.1
3.0
1.4
0.7
8.0
5.0
0.8
12.7
0.4
0.9
0.2
2.1
0.2
C
C
C
E
C
B
B
B
C
C
D
E
D
E
aExpressed as weight of pollutant/weight of gray iron produced.
bReferences 1,7,9-10.
cReferences 12,15. Includes averages for wet cap and other scrubber types not
already listed.
dReferences 12,17,19.
eReferences 8,11.
^References 12-14.
gReferences 8,11,29-30.
^References 1,6,23.
JReferences 6,23-24.
^References 1,12. For metal melting only.
raReference 4.
"Reference 1.
7.10-8
EMISSION FACTORS
10/86
-------
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7.10-9
EMISSION FACTORS
10/86
-------
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EMISSION FACTORS
10/86
-------
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Metallurgical Industry
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7.10-12
EMISSION FACTORS
10/86
-------
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TOTAL PARTI CULATE
EMISSION RATE
_ 69 kg PARTICULATE
10
-I
Mg METAL
MELTED (PRODUCED)
I II ll
i i
6.2
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PARTICLE DIAMETER, micrometers
10'
Figure 7.10-3. Particle size distribution for uncontrolled cupola.21-22
10/86
Metallurgical Industry
7.10-13
-------
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EMISSION RATE "°'4 Mg METAL
MELTED (PRODUCED)
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-I
10
PARTICLE DIAMETER, micrometers
7.10-14
Figure 7.10-4. Particle size distribution for
baghouse controlled cupola.13
EMISSION FACTORS
10/86
i
-------
'
99.950
99.90
99.80
99.50
99.
98.
95.
90.
i—
2
u 80.
u
£ 70-
a 60.
iu 50.
- 40.
i-
3 30.
| 20.
o
0 10.
5.
2.
,
0.5
0.2
0.15
O.I
On
TOTAL PARTI CUL ATE . _ kg PARTICULATE
— ] ^ •
- EMISSION RATE ' L5 Mq META(_
MELTED (PRODUCED)
rv/v— — "® ®~n
,JS)r*s~ ^J
&^
<3
m ^
-
-
.
-
-
-
-
-
-
i iiiiiiil i iiiiiiil i iiiiiit
M
5»
o
UI
l-
<
1-
co
V
UI
^
1.2 <
•^
3
I.I u
0.9 ^
0.8 £
o>
jc
UI
^_
<
3
^
U
j
<
UI
o>
2
10"' 10° 10 ' I02
PARTICLE DIAMETER, micrometers
Figure 7.10-5. Particle size distribution for venturi scrubber
controlled cupola.21-22
10/86
Metallurgical Industry
7.10-15
-------
99.990
99.950
99.90
99.80
99.50
99
98
95
90
z
UJ
o
o:
u
a.
UJ
U
80
70
60
50
40
30
20
10
5
2
I
0.5
0.2
0.15
O.I
0.0
TOTAL PARTICULATE= 6.4
EMISSION RATE
10"
kg PART1CULATE
Mg METAL
MELTED (PRODUCED)
5.9
5. 7
5.2
3.6
0,8
10° 10' ioj
PARTICLE DIAMETER, micrometers
UJ
N
V)
a
ui
t-
<
CO
v
UJ
u
P
oc
<
a.
UJ
H
UJ
2
Figure 7.10-6.
Particle size distribution for uncontrolled
electric arc furnace.3
7.10-16
EMISSION FACTORS
10/86
-------
99.9911
99.950
99.90
99.80
99.50
99
98
95
90
; so
> 70
J 60
50
i 40
• 30
j
> 20
> 10
5
2
1
0.5
0.2
0.15
O.I
n n
TOTAL PARTICULATE = 2.1 kg PARTICULATE
- EMISSION RATE Mg M£TAL
MELTED (PRODUCED)
-
-
-
_
_
; / ;
• ~/^
A-^^ '.
-
-
w
>
-
-
-
, ,
Ul
N
(O
a
UJ
t-
w
V
1.51 u
<
1.03 o
0.71 *
0.50
0.45 o>
0.40^
Ul
P
2
o
10"' 10° 10 '
PARTICLE DIAMETER, micrometers
UJ
10'
Figure 7.10-7.
Particle size distribution for uncontrolled
pouring and cooling.25
10/86
Metallurgical Industry
7.10-17
-------
99.990
99.950
99.90 -
99.80
99.50
99
98
95
90
z
LJ
U
2
UJ
.0° 10'
PARTICLE DIAMETER, micrometers
Figure 7.10-8. Particle size distribution for uncontrolled shakeout.26
7.10-18
EMISSION FACTORS
10/86
-------
REFERENCES FOR SECTION 7.10
1. Summary of Factors Affecting Compliance by Ferrous Foundries, Volume I:
Text, EPA-340/1-80-020, U. S. Environmental Protection Agency,
Washington, DC, January 1981.
2. Air Pollution Aspects of the Iron Foundry Industry, APTD-0806, U. S.
Environmental Protection Agency, Research Triangle Park, NC, February 1971.
3. Systems Analysis of Emissions and Emission Control in the Iron Foundry
Industry, Volume II; Exhibits, APTD-0645, U. S. Environmental Protection
Agency, Research Triangle Park, NC, February 1971.
4. J. A. Davis, et al., Screening Study on Cupolas and Electric Furnaces in
Gray Iron Foundries, EPA Contract No. 68-01-0611, Battelle Laboratories,
Columbus, OH, August 1975.
5. R. W. Hein, et al., Principles of Metal Casting, McGraw-Hill, New York,
1967.
6. P. Fennelly and P. Spawn, Air Pollution Control Techniques for Electric Arc
Furnaces in the Iron and Steel Foundry Industry, EPA-450/2-78-024, U. S.
Environmental Protection Agency, Research Triangle Park, NC, June 1978.
7. R. D. Chmielewski and S. Calvert, Flux Force/Condensation Scrubbing for
Collecting Fine Particulate from Iron Melting Cupola, EPA-600/7-81-148,
U. S. Environmental Protection Agency, Research Triangle Park, NC,
September 1981.
8. W. F. Hammond and S. M. Weiss, "Air Contaminant Emissions From Metallurgi-
cal Operations In Los Angeles County", Presented at the Air Pollution Con-
trol Institute, Los Angeles, CA, July 1964.
9. Particulate Emission Test Report On A Gray Iron Cupola at Cherryville
Foundry Works, Cherryville, NC, Department Of Natural And Economic Re-
sources, Raleigh, NC, December 18, 1975.
10. J. N. Davis, "A Statistical Analysis of the Operating Parameters Which
Affect Air Pollution Emissions From Cupolas", November 1977. Further
information unavailable.
11. Air Pollution Engineering Manual, Second Edition, AP-40, U. S. Environ-
mental Protection Agency, Research Triangle Park, NC, May 1973. Out of
Print.
12. Written communication from Dean Packard, Department Of Natural Resources,
Madison, WI, to Douglas Seeley, Alliance Technology, Bedford, MA, April
15, 1982.
13. Particulate Emissions Testing At Opelika Foundry, Birmingham, AL, Air
Pollution Control Commission, Montgomery, AL, November 1977 - January 1978.
14. Written communication from Minnesota Pollution Control Agency, St. Paul,
MN, to Mike Jasinski, Alliance Technology, Bedford, MA, July 12, 1982.
10/86 Metallurgical Industry 7.10-19
-------
15. Stack Test Report, Dunkirk Radiator Corporation Cupola Scrubber, State
Department Of Environmental Conservation, Region IX, Albany, NY, November
1975.
16. Particulate Emission Test Report For A Scrubber Stack For A Gray Iron
Cupola At Dewey Brothers, Goldsboro,NC, Department Of Natural Resources,
Raleigh, NC, April 7, 1978.
17. Stack Test Report, Worthington Corp. Cupola, State Department Of Environ-
mental Conservation, Region IX, Albany, NY, November 4-5, 1976.
18. Stack Test Report, Dresser Clark Cupola Wet Scrubber, Orlean, NY, State
Department Of Environmental Conservation, Albany, NY, July 14 & 18, 1977.
19. Stack Test Report, Chevrolet Tonawanda Metal Casting, Plant Cupola #3 And
Cupola #4, Tonawanda, NY, State Department Of Environmental Conservation,
Albany, NY, August 1977.
20. Stack Analysis For Particulate Emission, Atlantic States Cast Iron Foun-
dry/Scrubber, State Department Of Environmental Protection, Trenton, NJ,
September 1980.
21. S. Calvert, et al., Fine Particle Scrubber Performance, EPA-650/2-74-093,
U. S. Environmental Protection Agency, Cincinnati, OH, October 1974.
22. S. Calvert, et al., National Dust Collector Model 850 Variable Rod Module
Venturi Scrubber Evaluation, EPA-600/2-76-282, U. S. Environmental Protec-
tion Agency, Cincinnati, OH, December 1976.
23. Source Test, Electric Arc Furnace At Paxton-Mitchell Foundry, Omaha, NB,
Midwest Research Institute, Kansas City, MO, October 1974.
24. Source Test, John Deere Tractor Works, East Moline, IL, Gray Iron Electric
Arc Furnace, Walden Research, Wilmington, MA, July 1974
25. S. Gronberg, Characterization Of Inhalable Particulate Matter Emissions
From An Iron Foundry, Lynchburg Foundry, Archer Creek Plant, EPA-600/X-
85-328, U. S. Environmental Protection Agency, Cincinnati, OH, August 1984.
26. Particulate Emissions Measurements From The Rotoclone And General Casting
Shakeout Operations Of United States Pipe & Foundry, Inc, Anniston, AL,
State Air Pollution Control Commission, Montgomery, AL. Further informa-
tion unavailable.
27. Report Of Source Emissions Testing At Newbury Manufacturing, Talladega, AL,
State Air Pollution Control Commission, Montgomery, AL, May 15-16, 1979.
28. Particulate Emission Test Report For A Gray Iron Cupola At Hardy And New-
son, La Grange, NC, State Department Of Natural Resources And Community
Development, Raleigh, NC, August 2-3, 1977.
29. H. R. Crabaugh, et al., "Dust And Fumes From Gray Iron Cupolas: How Are
They Controlled In Los Angeles County", Air Repair, ji(3): 125-130, November
1954.
7.10-20 EMISSION FACTORS 10/86
-------
7.11 SECONDARY LEAD PROCESSING
7.11.1 Process Descriptionl-7
The secondary lead industry processes a variety of lead bearing scrap and
residue to produce lead and lead alloy ingots, battery lead oxide, and lead
pigments (Pb304 and PbO). Processing may involve scrap pretreatment, smelting,
and refining/casting. Processes typically used in each operation are shown in
Figure 7.11-1.
Scrap pretreatment is the partial removal of metal and nonmetal contamin-
ants from leadbearing scrap and residue. Processes used for scrap pretreatment
include battery breaking, crushing and sweating. Battery breaking is the
draining and crushing of batteries, followed by manual separation of the lead
from nonmetallic materials. Oversize pieces of scrap and residues are usually
put through jaw crushers. This separated lead scrap is then mixed with other
scraps and is smelted in reverberatory or blast furnaces to separate lead from
metals with higher melting points. Rotary gas or oil furnaces usually are used
to process low lead content scrap and residue, while reverberatory furnaces are
used to process high lead content scrap. The partially purified lead is peri-
odically tapped from these furnaces for further processing in smelting furnaces
or pot furnaces.
Smelting is the production of purified lead by melting and separating lead
from metal and nonmetallic contaminants and by reducing oxides to elemental
lead. Reverberatory smelting furnaces are used to produce a semisoft lead
product that contains typically 3 to 4 percent antimony. Blast furnaces produce
hard or antimonial lead containing about 10 percent antimony.
A reverberatory furnace,to produce semisoft lead, is charged with lead
scrap, metallic battery parts, oxides, drosses, and other residues. The rever-
beratory furnace is a rectangular shell lined with refractory brick, and it is
fired directly with oil or gas to a temperature of 1260°C (2300°F). The mater-
ial to be melted is heated by direct contact with combustion gases. The average
furnace can process about 45 megagraras per day (50 tons per day). About 47
percent of the charge is recovered as lead product and is periodically tapped
into molds or holding pots. Forty-six percent of the charge is removed as slag
and later processed in blast furnaces. The remaining 7 percent of the furnace
charge escapes as dust or fume.
Blast furnaces produce hard lead from charges containing siliceous slag
from previous runs (about 4.5 percent of the charge), scrap iron (about 4.5
percent), limestone (about 3 percent), and coke (about 5.5 percent). The re-
qaining 82.5 percent of the charge is comprised of oxides, pot furnace refining
drosses, and reverberatory slag. The proportions of rerun slags, limestone,
and coke, respectively vary to as high as 8 percent, 10 percent, and 8 percent
of the charge. Processing capacity of the blast furnace ranges from 18 to 73
megagrams per day (20 to 80 tons per day). Similar to iron cupolas, the blast
furnace is a vertical steel cylinder lined with refractory brick. Combustion
10/86 Metallurgical Industry 7.11-1
-------
O
CO
-O
OJ
6
CO
•a
fl
OJ
o
o
cC
o
•H
a
r-^
0)
3
bO
i
7.11-2
EMISSION FACTORS
10/86
-------
air at 3.4 to 5.2 kilopascals (0.5 to 0.75 pounds per square inch) is introduced
through tuyeres at the bottom of the furnace. Some of the coke combusts to melt
the charge, while the remainder reduces lead oxides to elemental lead. The
furnace exhaust is from 650° to 730°C (1200° to 1350°F).
As the lead charge melts, limestone and iron float to the top of the mol-
te molten bath and form a flux that retards oxidation of the product lead. The
molten lead flows from the furnace into a holding pot at a nearly continuous
rate. The product lead constitutes roughly 70 percent of the charge. From the
holding pot, the lead is usually cast into large ingots, called pigs, or sows.
About 18 percent of the charge is recovered as slag, with about 60 percent
of this being a sulfurous slag called matte. Roughly 5 percent of the charge
is retained for reuse, and the remaining 7 percent of the charge escapes as
dust or fume.
Refining/casting is the use of kettle type furnaces for remelting, alloy-
ing, refining, and oxidizing processes. Materials charged for remelting are
usually lead alloy ingots that require no further processing before casting.
The furnaces used for alloying, refining and oxidizing are usually gas fired,
and operating temperatures range from 370° to 480°C (700° to 900°F). Alloying
furnaces simply melt and mix ingots of lead and alloy materials. Antimony,
tin, arsenic, copper, and nickel are the most common alloying materials.
Refining furnaces are used either to remove copper and antimony for soft
lead production, or to remove arsenic, copper and nickel for hard lead
production. Sulfur may be added to the molten lead bath to remove copper.
Copper sulfide skimmed off as dross may subsequently be processed in a blast
furnace to recover residual lead. Aluminum chloride flux may be used to
remove copper, antimony and nickel. The antimony content can be reduced to
about 0.02 percent by bubbling air through the molten lead. Residual
antimony can be removed by adding sodium nitrate and sodium hydroxide to the
bath and skimming off the resulting dross. Dry dressing consists of adding
sawdust to the agitated mass of molten metal. The sawdust supplies carbon to
help separate globules of lead suspended in the dross and to reduce some of
the lead oxide to elemental lead.
Oxidizing furnaces, either kettle or reverberatory units, are used to
oxidize lead and to entrain the product lead oxides in the combustion air
stream, with subsequent recovery in high efficiency baghouses,
7.11.2 Emissions And Controls1 >^-5
Emission factors for controlled and uncontrolled processes and fugitive
particulate are given in Tables 7.11-1 and 7.11-2. Particulate emissions from
most processes are based on accumulated test data, whereas fugitive particulate
emission factors are based on the assumption that 5 percent of uncontrolled
stack emissions is released as fugitive emissions.
Reverberatory and blast furnaces account for the vast majority of the
total lead emissions from the secondary lead industry. The relative quantities
emitted from these two smelting processes can not be specified, because of a
lack of complete information. Most of the remaining processes are small emis-
sion sources with undefined emission characteristics.
10/86 Metallurgical Industry 7.11-3
-------
TABLE 7.11-1. EMISSION FACTORS FOR SECONDARY LEAD PROCESSING3
Pollutant
Sweating1" Leachlngc
Reverberatory
Smelting
Blast (cupola)d
Kettle Kettle
refining oxidation
Casting
Participate6
Uncontrolled (kg/Mg)
(lb/ton)
Controlled (kg/Mg)
(lb/ton)
Lead6
Uncontrolled (kg/Mg)
(lb/ton)
Controlled (kg/Mg)
(lb/ton)
Sulfur dioxide8
Uncontrolled (kg/Mg)
(lb/ton)
Emission Factor Rating
16-35
32-70
4-8P
7-16P
Neg*
Negf
Neg
Neg
Neg
Neg
Neg
Neg
Neg
Neg
162 (87-242)8
323 (173-483)».8
0.50 (0.26-0.77)"
1.01 (0.53-1.55)"
32 (17-48)99%.
8References 8-11.
"References 8,11-12.
JReference 13. Lead content of kettle refining emissions is 40*
and of casting emissions is 36%.
^References 1-2. Essentially all product lead oxide is entrained in an air stream and subsequently
recovered by baghouse with average collection efficiency >99I. Factor represents emissions of
lead oxide that escape a. baghouse used to collect the lead oxide product. Based on the amount of lead
produced and represents approximate upper limit for emissions.
•References 6,8-11.
"Inferences 6,8,11-12,14-15.
Preferences 3,5. Based on assumption that uncontrolled reverberatory furnace flua missions are 23Z lead.
iRcference 13. Uncontrolled reverberatory furnace flue emissions assumed to be 23% lead. Blast furnace
emissions have lead content of 34%, based on single uncontrolled plant test.
rReference 13. Blast furnace emissions have lead content of 26%, based on single controlled plant test.
8Based on quantity of material charged to furnaces.
7.11-4
EMISSION FACTORS
10/86
-------
TABLE 7.11-2. FUGITIVE EMISSION FACTORS FOR SECONDARY LEAD PROCESSING3
EMISSION FACTOR RATING: E
Operation
Sweating
Smelting
Kettle refining
Casting
Particulate
kg/Mg
0.8 - 1.8
4.3 - 12.1
0.001
0.001
Ib/ton
1.6 - 3.5b
8.7 - 24.2
0.002
0.002
Lead
kg/Mg
0.2 - 0.9
0.88 - 3.5d
0.0003d
0.0004d
Ib/ton
0.4 - 1.8°
1.75 - 7.0d
0.0006d
0.0007d
aReference 16. Based on amount of lead product, except for sweating, which
is based on quantity of material charged to furnace. Fugitive emissions
estimated to be 5% of uncontrolled stack emissions.
^Reference 1. Sweating furnace emissions estimated from nonlead secondary
nonferrous processing industries.
°References 3,5. Assumes 23% lead content of uncontrolled blast furnace
flue emissions.
dReference 13.
Emissions from battery breaking are mainly of sulfuric acid mist and dusts
containing dirt, battery case material and lead compounds. Emissions from
crushing are also mainly dusts.
Emissions from sweating operations are fume, dust, soot particles and
combustion products, including sulfur dioxide (802). The S02 emissions come
from combustion of sulfur compounds in the scrap and fuel. Dusts range in
particle size from 5 to 20 micrometers, and unagglomerated lead fumes range
from 0.07 to 0.4 micrometers, with an average diameter of 0.3. Particulate
loadings in the stack gas from reverberatory sweating range from 3.2 to 10.3
grams per cubic meter (1.4 to 4.5 grains per cubic foot). Baghouses are usually
used to control sweating emissions, with removal efficiencies exceeding 99
percent. The emission factors for lead sweating in Table 7.11-1 are based on
measurements at similar sweating furnaces in other secondary metal processing
industries, not on measurements at lead sweating furnaces.
Reverberatory smelting furnaces emit particulate and oxides of sulfur and
nitrogen. Particulate consists of oxides, sulfides and sulfates of lead, anti-
mony, arsenic, copper and tin, as well as unagglomerated lead fume. Particulate
loadings range from to 16 to 50 grams per cubic meter (7 to 22 grains per cubic
foot. Emissions are generally controlled with settling and cooling chambers,
followed by a baghouse. Control efficiencies generally exceed 99 percent. Wet
scrubbers are sometimes used to reduce S02 emissions. However, because of the
small particles emitted from reverberatory furnaces, baghouses are more often
used than scrubbers for particulate control.
Two chemical analyses by electron spectroscopy have shown the particulate
to consist of 38 to 42 percent lead, 20 to 30 percent tin, and about 1 percent
zinc.l^ Particulate emissions from reverberatory smelting furnaces are esti-
mated to contain 20 percent lead.
10/86
Metallurgical Industry
7.11-5
-------
TABLE 7.11-3. EMISSION FACTORS AND PARTICLE SIZE DISTRIBUTION FOR
BAGHOUSE CONTROLLED BLAST FURNACE FLUE GASES3
EMISSION FACTOR RATING: D
Particle
size*5
(urn)
15
10
6
2.5
1.25
1.00
0.625
Cumulative Cumulative emission factors
mass %
-------
TABLE 7.11-4.
EMISSION FACTORS AND PARTICLE SIZE DISTRIBUTION FOR UNCONTROLLED
AND BAGHOUSE CONTROLLED BLAST FURNACE VENTILATION3
EMISSION FACTOR RATING: D
Particle
sizeb
(urn)
15
10
6
2.5
1.25
1.00
0.625
Total
Cumulative
< stated
mass %
size
Uncontrolled Controlled
40.5
39.5
39.0
35.0
23.5
16.5
4.5
100.0
88.5
83.5
78.0
65.0
43.5
32.5
13.0
100.0
Cumulative emission factors
Uncontrolled
kg/Mg
25.7
25.1
24.8
22.2
14.9
10.5
2.9
63.5
Ib/ton
51.4
50.2
49.5
44.5
29.8
21.0
5.7
127.0
Controlled
kg /Kg
0.41
0.39
0.36
0.30
0.20
0.15
0.06
0.47
Ib/ton
0.83
0.78
0.73
0.61
0.41
0.30
0.12
0.94
aBased on lead, as produced. Includes emissions from charging,
metal and slag tapping.
cExpressed as equivalent aerodynamic particle diameter.
-o
OJ
o
s_
-I-"
o
o
25
20
en
s:
^ 15
t-
o
10
o
00
0.4
0.3
o.;
0.1
O
-l->
O
o
00
0.625 1.0 1.25 2.5 6.0 10.0 15.0
Particle size (urn)
Figure 7.11-3. Emission factors less than stated particle size for uncontrolled
and baghouse controlled blast furnace ventilation.
10/86
Metallurgical Industry
7.11-7
-------
TABLE 7.11-5. EFFICIENCIES OF PARTICULATE CONTROL EQUIPMENT
ASSOCIATED WITH SECONDARY LEAD SMELTING FURNACES
Control Furnace Control efficiency
equipment type (%)
Fabric filter3 Blast 98.4
Reverberatory 99.2
Dry cyclone plus fabric filter3 Blast 99.0
Wet cyclone plus fabric filter*5 Reverberatory 99.7
Settling chamber plus dry
cyclone plus fabric filter0 Reverberatory 99.8
Venturi scrubber plus demister^ Blast 99.3
3Reference 8.
^Reference 9.
cReference 10.
^Reference 14.
Particle size distributions and size specific emission factors for blast
furnace flue gases and for charging and tapping operations, respectively, are
presented in Tables 7.11-3 and 7.11-4, and Figures 7.11-2 and 7.11-3.
Emissions from blast furnaces occur at charging doors, the slag tap, the
lead well, and the furnace stack. The emissions are combustion gases (including
carbon monoxide, hydrocarbons, and oxides of sulfur and nitrogen) and partic-
ulate. Emissions from the charging doors and the slag tap are hooded and rout-
ed to the devices treating the furnace stack emissions. Blast furnace partic-
ulate is smaller than that emitted from reverberatory furnaces and is suitable
for control by scrubbers or fabric filters downstream of coolers. Efficiencies
for various control devices are shown in Table 7.11-5. In one application,
fabric filters alone captured over 99 percent of the blast furnace particulate
emissions.
Particulate recovered from the uncontrolled flue emissions at six blast
furnaces had an average lead content of 23 percent.3»5 Particulate recovered
from the uncontrolled charging and tapping hoods at one blast furnace had an
average lead content of 61 percent.13 Based on relative emission rates, lead
is 34 percent of uncontrolled blast furnace emissions. Controlled emissions
from the same blast furnace had lead content of 26 percent, with 33 percent
from flues, and 22 percent from charging and tapping operations.13 Particulate
recovered from another blast furnace contained 80 to 85 percent lead sulfate and
lead chloride, 4 percent tin, 1 percent cadmium, 1 percent zinc, 0.5 percent
antimony, 0.5 percent arsenic, and less than 1 percent organic matter.18
Kettle furnaces for melting, refining and alloying are relatively minor
emission sources. The kettles are hooded, with fumes and dusts typically
7.11-8 EMISSION FACTORS 10/86
i
-------
vented to baghouses and recovered at efficiencies exceeding 99 percent. Twenty
measurements of the uncontrolled particulates from kettle furnaces showed a
mass median aerodynamic particle diameter of 18.9 micrometers, with particle
size ranging from 0.05 to 150 micrometers. Three chemical analyses by electron
spectroscopy showed the composition of particulate to vary from 12 to 17 percent
lead, 5 to 17 percent tin, and 0.9 to 5.7 percent zinc.16
Emissions from oxidizing furnaces are economically recovered with bag-
houses. The particulates are mostly lead oxide, but they also contain amounts
of lead and other metals. The oxides range in size from 0.2 to 0.5 micrometers.
Controlled emissions have been estimated to be 0.1 kilograms per megagram (0.2
pounds per ton) of lead product, based on a 99 percent efficient baghouse.
References for Section 7.11
1. William M. Coltharp, et al., Multimedia Environmental Assessment of the
Secondary Nonferrous Metal Industry (Draft), Contract No. 68-02-1319,
Radian Corporation, Austin, TX, June 1976.
2. H. Nack, et al., Development of an Approach to Identification of Emerging
Technology and Demonstration Opportunities, EPA-650/2-74-048, U. S. Envi-
ronmental Protection Agency, Cincinnati, OH, May 1974.
3. J. M. Zoller, et al., A Method of Characterization and Quantification of
Fugitive Lead Emissions from Secondary Lead Smelters, Ferroalloy Plants
and Gray Iron Foundries (Revised). EPA-450/3-78-003 (Revised), U. S. Envi-
ronmental Protection Agency, Research Triangle Park, NC, August 1978.
4. Air Pollution Engineering Manual, Second Edition, AP-40, U. S. Environ-
mental Protection Agency, Research Triangle Park, NC, May 1973. Out of
Print.
5. Control Techniques for Lead Air Emissions, EPA-450/2-77-012, U. S. Envi-
ronmental Protection Agency, Research Triangle Park, NC, January 1978.
6. Background Information for Proposed New Source Performance Standards, Vol-
umes I and II: Secondary Lead Smelters and Refineries, APTD-1352a and b,
U. S. Environmental Protection Agency, Research Triangle Park, NC, June
1973.
7. J. W. Watson and K. J. Brooks, A Review of Standards of Performance for New
Stationary Sources - Secondary Lead Smelters, Contract No. 68-02-2526,
Mitre Corporation, McLean, VA, January 1979.
8. John E. Williamson, et al., A Study of Five Source Tests on Emissions from
Secondary Lead Smelters, County of Los Angeles Air Pollution Control
District, Los Angeles, CA, February 1972.
9. Emission Test No, 72-CI-8, Office Of Air Quality Planning And Standards,
U. S. Environmental Protection Agency, Research Triangle Park, NC, July
1972.
10/86 Metallurgical Industry 7.11-9
-------
10. Emission Test No. 72-CI-7, Office Of Air Quality Planning And Standards,
U. S. Environmental Protection Agency, Research Triangle Park, NC, August
1972.
11. A. E. Vandergrift, et al., Particulate Pollutant Systems Study, Volume I:
Mass Emissions, APTD-0743, U. S. Environmental Protection Agency, Research
Triangle Park, NC, May 1971.
12. Emission Test No. 71-CI-34, Office Of Air Quality Planning And Standards,
U. S. Environmental Protection Agency, Research Triangle Park, NC, July
1972.
13. Emissions and Emission Controls at a Secondary Lead Smelter (Draft),
Contract No. 68-03-2807, Radian Corporation, Durham, NC, January 1981.
14. Emission Test No. 71-CI-33, Office Of Air Quality Planning And Standards,
U. S. Environmental Protection Agency, Research Triangle Park, NC, August
1972.
15. Secondary Lead Plant Stack Emission Sampling At General Battery Corpora-
tion, Reading, Pennsylvania, Contract No. 68-02-0230, Battelle Institute,
Columbus, OH, July 1972.
16. Technical Guidance for Control of Industrial Process Fugitive Particulate
Emissions, EPA-450/3-77-010, U. S. Environmental Protection Agency,
Research Triangle Park, NC, March 1977.
17. E. I. Hartt, An Evaluation of Continuous Particulate Monitors at A Secon-
dary Lead Smelter, M. S. Report No. 0. R.-16, Environment Canada, Ottawa,
Canada. Date unknown.
18. J. E. Howes, et al., Evaluation of Stationary Source Particulate Measure-
ment Methods, Volume V; Secondary Lead Smelters, Contract No. 68-02-0609,
Battelle Laboratories, Columbus, OH, January 1979.
19. Silver Valley/Bunker Hill Smelter Environmental Investigation (Interim
Report), Contract No. 68-02-1343, Pedco, Inc., Cincinnati, OH, February
1975.
7.11-10 EMISSION FACTORS 10/86
-------
8.1 ASPHALTIC CONCRETE PLANTS
8.1.1 General 1-2
Asphaltic concrete paving is a mixture of well graded, high quality ag-
gregate and liquid asphaltic cement which is heated and mixed in measured quan-
tities to produce bituminous pavement material. Aggregate constitutes over
92 weight percent of the total mixture. Aside from the amount and grade
of asphalt used, mix characteristics are determined by the relative amounts
and types of aggregate used. A certain percentage of fine aggregate (% less
than 74 micrometers in physical diameter) is required for the production of
good quality asphaltic concrete.
Hot mix asphalt paving can be manufactured by batch mix, continuous mix
or drum mix process. Of these various processes, batch mix plants are cur-
rently predominant. However, most new installations or replacements to ex-
isting equipment are of the drum mix type. In 1980, 78 percent of the total
plants were of the conventional batch type, with 7 percent being continuous
mix facilities and 15 percent drum mix plants. Any of these plants can be
either permanent installations or portable.
Conventional Plants - Conventional plants produce finished asphaltic
concrete through either batch (Figure 8.1-1) or continuous (Figure 8.1-2)
mixing operations. Raw aggregate normally is stockpiled near the plant at a
location where the bulk moisture content will stabilize to between 3 and
5 weight percent.
As processing for either type of operation begins, the aggregate is
hauled from the storage piles and is placed in the appropriate hoppers of the
cold feed unit. The material is metered from the hoppers onto a conveyor belt
and is transported into a gas or oil fired rotary dryer. Because a substantial
portion of the heat is transferred by radiation, dryers are equipped with
flights designed to tumble the aggregate to promote drying.
As it leaves the dryer, the hot material drops into a bucket elevator
and is transferred to a set of vibrating screens and classified into as many
as four different grades (sizes). The classified material then enters the
mixing operation.
In a batch plant, the classified aggregate drops into four large bins
according to size. The operator controls the aggregate size distribution by
opening various bins over a weigh hopper until the desired mix and weight are
obtained. This material is dropped into a pug mill (mixer) and is mixed dry
for about 15 seconds. The asphalt, a solid at ambient temperature, is pumped
from a heated storage tank, weighed and injected into the mixer. Then the
hot mix is dropped into a truck and is hauled to the job site.
In a continuous plant, the dried and classified aggregate drops into a
set of small bins which collects the aggregate and meters it through a set of
feeder conveyors to another bucket elevator and into the mixer. Asphalt
is metered through the inlet end of the mixer, and retention time is
l°/86 Mineral Products Industry 8.1-1
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controlled by an adjustable dam at the opposite end. The hot mix flows out
of the mixer into a surge hopper, from which trucks are loaded.
Drum Mix Plants - The drum mix process simplifies the conventional pro-
cess by using proportioning feed controls in place of hot aggregate storage
bins, vibrating screens and the mixer. Aggregate is introduced near the
burner end of the revolving drum mixer, and the asphalt is injected midway
along the drum. A variable flow asphalt pump is linked electronically to the
aggregate belt scales to control mix specifications. The hot mix is dis-
charged from the revolving drum mixer into surge bins or storage silos. Fig-
ure 8.1-3 is a diagram of the drum mix process.
Drum mix plants generally use parallel flow design for hot burner gases
and aggregate flow. Parallel flow has the advantage of giving the mixture a
longer time to coat and to collect dust in the mix, thereby reducing partic-
ulate emissions. The amount of particulate generated within the dryer in
this process is usually lower than that generated within conventional dryers,
but because asphalt is heated to high temperatures for a long period of time,
organic emissions (gaseous and liquid aerosol) are greater than in conven-
tional plants.
Recycle Processes - In recent years, recycling of old asphalt paving has
been initiated in the asphaltic concrete industry. Recycling significantly
reduces the amount of new (virgin) rock and asphaltic cement needed to repave
an existing road. The various recycling techniques include both cold and hot
methods, with the hot processing conducted at a central plant.
In recycling, old asphalt pavement is broken up at a job site and is re-
moved from the road base. This material is then transported to the plant,
crushed and screened to the appropriate size for further processing. The
paving material is then heated and mixed with new aggregate (if applicable),
to which the proper amount of new asphaltic cement is added to produce a
grade of hot asphalt paving suitable for laying.
There are three methods which can be used to heat recycled asphalt pav-
ing before the addition of the asphaltic cement: direct flame heating, in-
direct flame heating, and superheated aggregate.
Direct flame heating is typically performed with a drum mixer, wherein
all materials are simultaneously mixed in the revolving drum. The first ex-
perimental attempts at recycling used a standard drum mix plant and introduced
the recycled paving and virgin aggregate concurrently at the burner end of
the drum. Continuing problems with excessive blue smoke emissions led to
several process modifications, such as the addition of heat shields and the
use of split feeds.
One method of recycling involves a drum mixer with a heat dispersion
shield. The heat shield is installed around the burner, and additional cool-
ing air is provided to reduce the hot gases to a temperature below 430 to
650°C (800 to 1200°F), thus decreasing the amount of blue smoke. Although
now considered obsolete, a drum within a drum design has also been successfully
8.1-4 EMISSION FACTORS 10/86
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used for recycling. Reclaimed material is introduced into the outer drum
through a separate charging chute while virgin material is introduced into
the inner drum.
Split feed drum mixers were first used for recycling in 1976 and are now
the most popular design. At about the midpoint of the drum, the recycled
bituminous material is introduced by a split feed arrangement and is heated
by both the hot gases and heat transfer from the superheated virgin aggregate.
Another type of direct flame method involves the use of a slinger conveyor to
throw recycled material into the center of the drum mixer from the discharge
end. In this process, the recycled material enters the drum along an arc,
landing approximately at the asphalt injection point.
Indirect flame heating has been performed with special drum mixers
equipped with heat exchanger tubes. These tubes prevent the mixture of
virgin aggregate and recycled paving from coming into direct contact with the
flame and the associated high temperatures. Superheated aggregate can also
be used to heat recycled bituminous material.
In conventional plants, recycled paving can be introduced either into
the pug mill or at the discharge end of the dryer, after which the tempera-
ture of the material is raised by heat from the virgin aggregate. The proper
amount of new asphaltic cement is then added to the virgin aggregate/recycle
paving mixture to produce high grade asphaltic concrete.
Tandem drum mixers can also be used to heat the recycle material. The
first drum or aggregate dryer is used to superheat the virgin aggregate, and
a second drum or dryer either heats recycled paving only or mixes and heats a
combination of virgin and recycled material. Sufficient heat remains in the
exhaust gas from the first dryer to heat the second unit also.
8.1.2 Emissions and Controls
Emission points at batch, continuous and drum mix asphalt plants dis-
cussed below refer to Figures 8.1-1, 8.1-2 and 8.1-3, respectively.
Conventional Plants - As with most facilities in the mineral products
industry, conventional asphaltic concrete plants have two major categories of
emissions, those which are vented to the atmosphere through some type of
stack, vent or pipe (ducted sources), and those which are not confined to
ducts and vents but are emitted directly from the source to the ambient air
(fugitive sources). Ducted emissions are usually collected and transported
by an industrial ventilation system with one or more fans or air movers,
eventually to be emitted to the atmosphere through some type of stack.
Fugitive emissions result from process sources, which consist of a combina-
tion of gaseous pollutants and particulate matter, or open dust sources.
The most significant source of ducted emissions from conventional as-
phaltic concrete plants is the rotary dryer. The amount of aggregate dust
carried out of the dryer by the moving gas stream depends upon a number of
factors, including the gas velocity in the drum, the particle size distribution
8.1-6 EMISSION FACTORS ]0/86
-------
of the aggregate, and the specific gravity and aerodynamic characteristics of
the particles. Dryer emissions also contain the fuel combustion products of
the burner.
There may also be some ducted emissions from the heated asphalt storage
tanks. These may consist of combustion products from the tank heater.
The major source of process fugitives in asphalt plants is enclosures
over the hot side conveying, classifying and mixing equipment which are
vented into the primary dust collector along with the dryer gas. These vents
and enclosures are commonly called a "fugitive air" or "scavenger" system.
The scavenger system may or may not have its own separate air mover device,
depending on the particular facility. The emissions captured and transported
by the scavenger system are mostly aggregate dust, but they may also contain
gaseous volatile organic compounds (VOC) and a fine aerosol of condensed
liquid particles. This liquid aerosol is created by the condensation of gas
into particles during cooling of organic vapors volatilized from the asphal-
tic cement in the pug mill. The amount of liquid aerosol produced depends to
a large extent on the temperature of the asphaltic cement and aggregate
entering the pug mill. Organic vapor and its associated aerosol are also
emitted directly to the atmosphere as process fugitives during truck loadout,
from the bed of the truck itself during transport to the job site, and from
the asphalt storage tank, which also may contain small amounts of polycyclic
compounds.
The choice of applicable control equipment for the drier exhaust and
vent line ranges from dry mechanical collectors to scrubbers and fabric col-
lectors. Attempts to apply electrostatic precipitators have met with little
success. Practically all plants use primary dust collection equipment like
large diameter cyclones, skimmers or settling chambers. These chambers are
often used as classifiers to return collected material to the hot elevator
and to combine it with the drier aggregate. Because of high pollutant levels,
the primary collector effluent is ducted to a secondary collection device.
Table 8.1-1 presents total particulate emission factors for conventional
asphaltic concrete plants, with the factors based on the type of control
technology employed. Size specific emission factors for conventional asphalt
plants, also based on the control of technology used, are shown in Table 8.1-2
and Figure 8.1-4. Interpolations of size data other than those shown in Fig-
ure 8.1-4 can be made from the curves provided.
There are also a number of open dust sources associated with conven-
tional asphalt plants. These include vehicle traffic generating fugitive
dust on paved and unpaved roads, handling aggregate material, and similar
operations. The number and type of fugitive emission sources associated with
a particular plant depend on whether the equipment is portable or stationary
and whether it is located adjacent to a gravel pit or quarry. Fugitive dust
may range from 0.1 micrometers to more than 300 micrometers in diameter. On
the average, 5 percent of cold aggregate feed is less than 74 micrometers
(minus 200 mesh). Dust that may escape collection before primary control
generally consists of particulate having 50 to 70 percent of the total mass
being less than 74 micrometers. Uncontrolled particulate emission factors
for various types of fugitive sources in conventional asphaltic concrete
plants can be found in Section 11.2.3 of this document.
10/86 Mineral Products Industry 8.1-7
-------
TABLE 8.1-1. EMISSION FACTORS FOR TOTAL PARTICULATE
FROM CONVENTIONAL ASPHALTIC CONCRETE PLANTS3
Type of control Emission factor
kg/Mg Ib/ton
Uncontrolled '
Precleaner
High efficiency cyclone
Spray tower
Baffle spray tower
Multiple centrifugal scrubber
Orifice scrubber
Venturi scrubber
Baghouse
22.5
7.5
0.85
0.20
0.15
0.035
0.02
0.02
0.01
45.0
15.0
1.7
0.4
0.3
0.07
0.04
0.04
0.02
o
References 1-2, 5-10, 14-16. Expressed in terms of
emissions per unit weight of asphaltic concrete pro-
duced. Includes both batch mix and continuous mix
.processes.
Almost all plants have at least a precleaner follow-
ing the rotary drier.
Reference 16. These factors differ from those given
in Table 8.1-6 because they are for uncontrolled
.emissions and are from an earlier survey.
Reference 15. Range of values = 0.004 - 0.0690 kg/Mg.
Average from a properly designed, installed, operated
and maintained scrubber, based on a study to develop
New Source Performance Standards.
References 14-15. Range of values = 0.013 - 0.0690
fkg/Mg.
References 14-15. Emissions from a properly de-
signed, installed, operated and maintained bag-
house, based on a study to develop New Source Per-
formance Standards. Range of values = 0.008 - 0.018
kg/Mg.
,1-8 EMISSION FACTORS 10/86
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8.1-10
EMISSION FACTORS
10/86
-------
Drum Mix Plants - As with the other two asphaltic concrete production
processes, the most significant ducted source of particulate emissions is the
drum mixer itself. Emissions from the drum mixer consist of a gas stream with
a substantial amount of particulate matter and lesser amounts of gaseous VOC
of various species. The solid particulate generally consists of fine aggre-
gate particles entrained in the flowing gas stream during the drying process.
The organic compounds, on the other hand, result from heating and mixing of
asphalt cement inside the drum, which volatilizes certain components of the
asphalt. Once the VOC have sufficiently cooled, some condense to form the
fine liquid aerosol (particulate) or "blue smoke" plume typical of drum mix
asphalt plants.
A number of process modifications have been introduced in the newer plants
to reduce or eliminate the blue smoke problem, including installation of flame
shields, rearrangement of the flights inside the drum, adjustments in the
asphalt injection point, and other design changes. Such modifications result
in significant improvements in the elimination of blue smoke.
Emissions from the drum mix recycle process are similar to emissions from
regular drum mix plants, except that there are more volatile organics because
of the direct flame volatilization of petroleum derivatives contained in the
old asphalt paving. Control of liquid organic emissions in the drum mix re-
cycle process is through some type of process modification, as described above.
Table 8.1-3 provides total particulate emission factors for ducted emis-
sions in drum mix asphaltic concrete plants, with available size specific emis-
sion factors shown in Table 8.1-4 and Figure 8.1-5.
TABLE 8.1-3. TOTAL PARTICULATE EMISSION FACTORS FOR
DRUM MIX ASPHALTIC CONCRETE PLANTS3
EMISSION FACTOR RATING: B
Type of control Emission factor
kg/Mg Ib/ton
Uncontrolled
Cyclone or multiclone ,
Low energy wet scrubber
Venturi scrubber
2.45
0.34
0.04
0.02
4.9
0.67
0.07
0.04
Reference 11. Expressed in terms of emissions per
unit weight of asphaltic concrete produced. These
factors differ from those for conventional asphaltic
concrete plants because the aggregate contacts and
is coated with asphalt early in the drum mix pro-
, cess.
Either stack sprays, with water droplets injected
into the exit stack, or a dynamic scrubber with a
wet fan.
10/86 Mineral Products Industry 8.1-11
-------
TABLE 8.1-4. PARTICLE SIZE DISTRIBUTION AND SIZE SPECIFIC EMISSION FACTORS FOR
DRUM MIX ASPHALT PLANTS CONTROLLED BY A BAGHOUSE COLLECTOR3
EMISSION FACTOR RATING: D
Cumulative mass S stated
Cumulative particulate emission factors
^ stated size
S 1.Z6
((JmA) Uncontrolled
2.5 5.5
10.0 23
15.0 27
Total mass
emxssion
factor
Condensable
e
organics
{/oj TT _f -i -I _j°- Pnnf t-nl 1 oH6
Controlledf kg/Mg Ib/ton 10"3 kg/Mg 10"3 Ib/ton
11 0.14 0.27 0.53 1.1
32 0.57 1.1 1.6 3.2
35 0.65 1.3 1.7 3.5
2.5 4.9 4.9 9.8
3.9 7.7
.Reference 23, Table 3-35. Rounded to two significant figures.
Aerodynamic diameter.
Expressed in terms of emissions per unit weight of asphaltic concrete produced. Not
.generally applicable to recycle processes.
Based on an uncontrolled emission factor of 2.45 kg/Mg (see Table 8.1-3).
Reference 23. Calculated using an overall collection efficiency of 99.8% for a
fbaghouse applied to an uncontrolled emission factor of 2.45 kg/Mg.
Includes data from two out of eight tests where ~ 30% recycled asphalt paving was
processed using a split feed process.
^Determined at outlet of a baghouse collector while plant was operating with ~ 30%
recycled asphalt paving. Factors are applicable only to a direct flame heating
process with a split feed.
8.1-12
EMISSION FACTORS
10/86
-------
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Figure 8.1-5. Particle size distribution and size
specific emission factors for drum mix
asphaltic concrete plants.
10/86
Mineral Products Industry
8.1-13
-------
Interpolations of the data shown in Figure 8.1-5 to particle sizes other than
those indicated can be made from the curves provided.
Process fugitive emissions normally associated with batch and continuous
plants from the hot side screens, bins, elevators and pug mill have been
eliminated in the drum mix process. There may be, however, a certain amount
of fugitive VOC and liquid aerosol produced from transport and handling of
hot mix from the drum mixer to the storage silo, if an open conveyor is used,
and also from the beds of trucks. The open dust sources associated with drum
mix plants are similar to those of batch or continuous plants, with regard to
truck traffic and aggregate handling operations.
8.1.3 Representative Facility
Factors for various materials emitted from the stack of a typical
asphaltic concrete plant are given in Table 8.1-5, and the characteristics of
such a plant are shown in Table 8.1-6. With the exception of aldehydes, the
materials listed in Table 8.1-6 are also emitted from the mixer, but in con-
centrations 5 to 100 fold smaller than stack gas concentrations, and they
last only during the discharge of the mixer.
Reference 16 reports mixer emissions of SO , NO , and VOC as "less than"
values, so it is possible they may not be present at all. Particulates,
carbon monoxide, polycyclics, trace metals and hydrogen sulfide were observed
at concentrations that were small relative to stack amounts. Emissions from
the mixer are thus best treated as fugitive.
All emission factors for the typical facility are for controlled opera-
tion and are based either on average industry practice shown by survey or on
results of actual testing in a selected typical plant.
An industrial survey16 showed that over 66 percent of operating hot mix
asphalt plants use fuel oil for combustion. Possible sulfur oxide emissions
from the stack were calculated, assuming that all sulfur in the fuel oil is
oxidized to SO . The amount of sulfur oxides actually released through the
stack may be attenuated by water scrubbers, or even by the aggregate itself,
if limestone is being dried. Number 2 fuel oil has an average sulfur content
of 0.22 weight percent.
Emission factors for nitrogen oxides, nonmethane volatile organics, car-
bon monoxide, polycyclic organic material, and aldehydes were determined by
sampling stack gas at the representative asphalt hot mix plant.
8.1-14 EMISSION FACTORS
10/6
-------
TABLE 8.1-5. EMISSION FACTORS FOR SELECTED GASEOUS POLLUTANTS
FROM A CONVENTIONAL ASPHALTIC CONCRETE PLANT STACK3
Material emitted
Sulfur oxides (as S02)d'e
Nitrogen oxides (as N02)
Volatile organic compounds
Carbon monoxide
Polycyclic organic material
Aldehydes
Formaldehyde
2-Methylpropanal
(isobutyraldehyde)
1-Butanal
(n-butyraldehyde)
3-Methylbutanal
(isovaleraldehyde)
Emission
Factor
Rating
C
D
D
D
D
D
D
D
D
D
Emission
g/Mg
146S
18
14
19
0.013
10
0.075
0.65
1.2
8.0
factor
Ib/ton
0.292S
0.036
0.028
0.038
0.000026
0.02
0.00015
0.0013
0.0024
0.016
.Reference 16.
Particulates, carbon monoxide, polycyclics, trace metals and
hydrogen sulfide were observed in the mixer emissions at con-
centrations that were small relative to stack concentrations.
.Expressed as g/Mg and Ib/ton of asphaltic concrete produced.
Mean source test results of a 400 plant survey.
Reference 21. S = % sulfur in fuel. S02 may be attenuated
,.50% by adsorption on alkaline aggregate.
Based on limited test data from the single asphaltic concrete
plant described in Table 8.1-6.
10/86
Mineral Products Industry
8.1-15
-------
TABLE 8.1-6. CHARACTERISTICS OF A REPRESENTATIVE
ASPHALTIC CONCRETE PLANT SELECTED FOR SAMPLING3
Parameter
Plant sampled
Plant type
Production rate,
Mg/hr (tons/hr)
Mixer capacity,
Mg (tons)
Primary collector
Secondary collector
Fuel
Release agent
Stack height, m (ft)
Conventional, permanent,
batch plant
160.3 ± 16% (177 ± 16%)
3.6 (4.0)
Cyclone
Wet scrubber (venturi)
Oil
Fuel oil
15.85 (52)
Reference 16, Table 16.
References for Section 8.1
1. Asphaltic Concrete Plants Atmospheric Emissions Study, EPA Contract No.
68-02-0076, Valentine, Fisher, and Tomlinson, Seattle, WA, November 1971.
2. Guide for Air Pollution Control of Hot Mix Asphalt Plants, Information
Series 17, National Asphalt Pavement Association, Riverdale, MD, 1965.
3. R. M. Ingels, et al. , "Control of Asphaltic Concrete Batching Plants in
Los Angeles County", Journal of the Air Pollution Control Association,
: 29-33, January 1960.
4. H. E. Friedrich, "Air Pollution Control Practices and Criteria for Hot
Mix Asphalt Paving Batch Plants", Journal of the Air Pollution Control
Association, 19^(12) : 924-928 , December 1969.
5. Air Pollution Engineering Manual, AP-40, U. S. Environmental Protection
Agency, Research Triangle Park, NC, 1973. Out of Print.
6. G. L. Allen, et al. , "Control of Metallurgical and Mineral Dust and Fumes
in Los Angeles County, California", Information Circular 7627 , U. S. De-
partment of Interior, Washington, DC, April 1952.
8.1-16
EMISSION FACTORS
10/86
-------
7. P. A. Kenline, Unpublished report on control of air pollutants from chem-
ical process industries, U. S. Environmental Protection Agency, Cincinnati,
OH, May 1959.
8. Private communication on particulate pollutant study between G. Sallee,
Midwest Research Institute, Kansas City, MO, and U. S. Environmental Pro-
tection Agency, Research Triangle Park, NC, June 1970.
9. J. A. Danielson, Unpublished test data from asphalt batching plants, Los
Angeles County Air Pollution Control District, Presented at Air Pollution
Control Institute, University of Southern California, Los Angeles, CA,
November 1966.
10. M. E. Fogel, et al., Comprehensive Economic Study of Air Pollution Con-
trol Costs for Selected Industries and Selected Regions, R-OU-455, U. S.
Environmental Protection Agency, Research Triangle Park, NC, February
1970.
11. Preliminary Evaluation of Air Pollution Aspects of the Drum Mix Process,
EPA-340/1-77-004, U. S. Environmental Protection Agency, Research Triangle
Park, NC, March 1976.
12. R. W. Beaty and B. M. Bunnell, "The Manufacture of Asphalt Concrete Mix-
tures in the Dryer Drum", Presented at the Annual Meeting of the Canadian
Technical Asphalt Association, Quebec City, Quebec, November 19-21, 1973.
13. J. S. Kinsey, "An Evaluation of Control Systems and Mass Emission Rates
from Dryer Drum Hot Asphalt Plants", Journal of the Air Pollution Control
Association, 26(12):1163-1165, December 1976.
14. Background Information for Proposed New Source Performance Standards,
APTD-1352A and B, U. S. Environmental Protection Agency, Research Triangle
Park, NC, June 1973.
15. Background Information for New Source Performance Standards, EPA 450/2-74-
003, U. S. Environmental Protection Agency, Research Triangle Park, NC,
February 1974.
16. Z. S. Kahn and T. W. Hughes, Source Assessment: Asphalt Paving Hot Mix,
EPA-600/2-77-107n, U. S. Environmental Protection Agency, Cincinnati, OH,
December 1977.
17. V. P. Puzinauskas and L. W. Corbett, Report on Emissions from Asphalt Hot
Mixes, RR-75-1A, The Asphalt Institute, College Park, MD, May 1975.
18. Evaluation of Fugitive Dust from Mining, EPA Contract No. 68-02-1321,
PEDCo Environmental, Inc., Cincinnati, OH, June 1976.
19. J. A. Peters and P. K. Chalekode, "Assessment of Open Sources", Presented
at the Third National Conference on Energy and the Environment, College
Corner, OH, October 1, 1975.
10/86 Mineral Products Industry 8.1-17
-------
20. Illustration of Dryer Drum Hot Mix Asphalt Plant, Pacific Environmental
Services, Inc., Santa Monica, CA, 1978.
21. Herman H. Forsten, "Applications of Fabric Filters to Asphalt Plants",
Presented at the 71st Annual Meeting of the Air Pollution Control Asso-
ciation, Houston, TX, June 1978.
22. Emission Of Volatile Organic Compounds From Drum Mix Asphalt Plants, EPA-
600/2-81-026, U. S. Environmental Protection Agency, Washington, DC,
February 1981.
23. J. S. Kinsey, Asphaltic Concrete Industry - Source Category Report, EPA-
600/7-86-038, U. S. Environmental Protection Agency, Cincinnati, OH,
October 1986.
8.1-18 EMISSION FACTORS 10/86
-------
8.3 BRICKS AND RELATED CLAY PRODUCTS
8.3.1 Process Description
The manufacture of brick and related products such as clay pipe, pottery
and some types of refractory brick involves the mining, grinding, screening and
blending of the raw materials, and the forming, cutting or shaping, drying or
curing, and firing of the final product.
Surface clays and shales are mined in open pits. Most fine clays are
found underground. After mining, the material is crushed to remove stones and
is stirred before it passes onto screens for segregation by particle size.
To start the forming process, clay is mixed with water, usually in a pug
mill. The three principal processes for forming brick are stiff mud, soft mud
and dry press. In the stiff mud process, sufficient water is added to give the
clay plasticity, and bricks are formed by forcing the clay through a die. Wire
is used in separating bricks. All structural tile and most brick are formed by
this process. The soft mud process is usually used with clay too wet for the
stiff mud process. The clay is mixed with water to a moisture content of 20 to
30 percent, and the bricks are formed in molds. In the dry press process, clay
is mixed with a small amount of water and formed in steel molds by applying
pressure of 3.43 to 10.28 megapascals (500 to 1500 pounds per square inch). A
typical brick manufacturing process is shown in Figure 8.3-1.
Wet clay units that have been formed are almost completely dried before
firing, usually with waste heat from kilns. Many types of kilns are used for
firing brick, but the most common are the downdraft periodic kiln and the
tunnel kiln. The periodic kiln is a permanent brick structure with a number
of fireholes where fuel enters the furnace. Hot gases from the fuel are drawn
up over the bricks, down through them by underground flues, and out of the oven
to the chimney. Although lower heat recovery makes this type less efficient
than the tunnel kiln, the uniform temperature distribution leads to a good
quality product. In most tunnel kilns, cars carrying about 1200 bricks travel
on rails through the kiln at the rate of one 1.83 meter (6 foot) car per hour.
The fire zone is located near the middle of the kiln and is stationary.
In all kilns, firing takes place in six steps: evaporation of free water,
dehydration, oxidation, vitrification, flashing, and cooling. Normally, gas or
residual oil is used for heating, but coal may be used. Total heating time
varies with the type of product, for example, 22.9 centimeter (9 inch) refrac-
tory bricks usually require 50 to 100 hours of firing. Maximum temperatures of
about 1090°C (2000°F) are used in firing common brick.
10/86 Mineral Products Industry 8.3-1
-------
8.3.2 Emissions And Controlsl>3
Particulate matter is the primary emission in the manufacture of bricks.
The main source of dust is the materials handling procedure, which includes
drying, grinding, screening and storing the raw material. Combustion products
are emitted from the fuel consumed in the dryer and the kiln. Fluorides,
largely in gaseous form, are also emitted from brick manufacturing operations.
Sulfur dioxide may be emitted from the bricks when temperatures reach or exceed
1370°C (2500°F), but no data on such emissions are available.4
CRUSHING
AND
STORAGE
(P)
PULVERIZING
(P)
CPRFFNTNG
(P)
FORMING
AND
CUTTING
FUEL
GLAZING
DRYING
(P)
HOT
GASES
T
KILN
(P)
STORAGE
AND
SHIPPING
(P)
Figure 8.3-1.
Basic flow diagram of brick manufacturing process.
(P = a major source of particulate emissions)
A variety of control systems may be used to reduce both particulate and
gaseous emissions. Almost any type of particulate control system will reduce
emissions from the material handling process, but good plant design and hooding
are also required to keep emissions to an acceptable level.
The emissions of fluorides can be reduced by operating the kiln at tem-
peratures below 1090°C (2000°F) and by choosing clays with low fluoride con-
tent. Satisfactory control can be achieved by scrubbing kiln gases with water,
since wet cyclonic scrubbers can remove fluorides with an efficiency of 95
percent or higher.
Table 8.3-1 presents emission factors for brick manufacturing without
controls. Table 8.3-2 presents data on particle size distribution and emission
factors for uncontrolled sawdust fired brick kilns. Table 8.3-3 presents data
on particle size distribution and emission factors for uncontrolled coal fired
tunnel brick kilns.
i
8.3-2
EMISSION FACTORS
10/86
-------
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TABLE 8.3-2. PARTICLE SIZE DISTRIBUTION AND EMISSION FACTORS FOR
UNCONTROLLED SAWDUST FIRED BRICK KILNS8
EMISSION FACTOR RATING: E
Aerodynamic particle
diameter (ym)
Cumulative weight %
< stated size
Emission factor^
(kg/Mg)
2.5
6.0
10.0
36.5
63.0
82.5
0.044
0.076
0.099
Total particulate emission factor 0.12C
aReference 13.
^Expressed as cumulative weight of particulate <^ corresponding particle
size/unit weight of brick produced.
cTotal mass emission factor from Table 8.3-1.
01
N
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CV
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3
E
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-•- Weight percent
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-------
TABLE 8.3-3. PARTICLE SIZE DISTRIBUTION AND EMISSION FACTORS FOR
UNCONTROLLED COAL FIRED TUNNEL BRICK KILNS3
EMISSION FACTOR RATING: E
Aerodynamic particle
diameter (pm)
2.5
6.0
10.0
1
Cumulative weight %
< stated size
24.7
50.4
71.0
Cotal particulate emission
Emission factor*5
(kg/Mg)
0.08A
0.17A
0.24A
factor 0.34AC
aReferences 12, 17.
"Expressed as cumulative weight of particulate <^ corresponding particle
size/unit weight of brick produced. A = % ash in coal. (Use 10% if
ash content is not known).
cTotal mass emission factor from Table 8.3-1.
°
3
6
UNCONTROLLED
—•- Weight percent
Emission factor
r
o
D
to
o
rr
O
j?
10 X 40 M M TD 10 90 100
Particle diameter,
Figure 8.3-3. Cumulative weight percent of
particles less than stated particle diameters
for uncontrolled coal fired tunnel brick kilns
10/86
Mineral Products Industry
8.3-5
-------
TABLE 8.3-4. PARTICLE SIZE DISTRIBUTION AND EMISSION FACTORS FOR
UNCONTROLLED SCREENING AND GRINDING OF RAW MATERIALS
FOR BRICKS AND RELATED CLAY PRODUCTSA
EMISSION FACTOR RATING:
Aerodynamic particle
diameter (ym)
2.5
6.0
10.0
Tc
Cumulative weight %
< stated size
0.2
0.4
7.0
Emission factor*5
(kg/Mg)
0.08
0.15
2.66
)tal particulate emission factor 38C
1
References 11, 18.
^Expressed as cumulative weight of particulate <^ corresponding
particle size/unit weight of raw material processed.
cTotal mass emission factor from Table 8.3-1.
N
01 n
-O "
-------
References for Section 8.3
1. Air Pollutant Emission Factors, APTD-0923, U. S. Environmental Protection
Agency, Research Triangle Park, NC, April 1970.
2. "Technical Notes on Brick and Tile Construction", Pamphlet No. 9, Structural
Clay Products Institute, Washington, DC, September 1961.
3. Unpublished control techniques for fluoride emissions, U. S. Department Of
Health And Welfare, Washington, DC, May 1970.
4. M. H. Allen, "Report on Air Pollution, Air Quality Act of 1967 and Methods
of Controlling the Emission of Particulate and Sulfur Oxide Air Pollutants",
Structural Clay Products Institute, Washington, DC, September 1969.
5. F. H. Norton, Refractories, 3rd Ed, McGraw-Hill, New York, 1949.
6. K. T. Semrau, "Emissions of Fluorides from Industrial Processes: A Review",
Journal Of The Air Pollution Control Association, ^(2):92-108, August 1957.
7. Kirk-Othmer Encyclopedia of Chemical Technology, Vol 5, 2nd Edition, John
Wiley and Sons, New York, 1964.
8. K. F. Wentzel, "Fluoride Emissions in the Vicinity of Brickworks", Staub,
_25_(3): 45-50, March 1965.
9. "Control of Metallurgical and Mineral Dusts and Fumes in Los Angeles
County", Information Circular No. 7627, Bureau Of Mines, U. S. Department
Of Interior, Washington, DC, April 1952.
10. Notes on oral communication between Resources Research, Inc., Reston, VA
and New Jersey Air Pollution Control Agency, Trenton, NJ, July 20, 1969.
11. H. J. Taback, Fine Particle Emissions from Stationary and Miscellaneous
Sources in the South Coast Air Basin, PB 293 923/AS, National Technical
Information Service, Springfield, VA, February 1979.
12. Building Brick and Structural Clay Industry - Lee Brick and Tile Co.,
Sanford, NC, EMB 80-BRK-l, U. S. Environmental Protection Agency,
Research Triangle Park, NC, April 1980.
13. Building Brick and Structural Clay Wood Fired Brick Kiln - Emission Test
Report - Chatham Brick and Tile Company, Gulf, North Carolina, EMB-80-
BRK-5, U. S. Environmental Protection Agency, Research Triangle Park, NC,
October 1980.
14. R. N. Doster and D. J. Grove, Stationary Source Sampling Report: Lee Brick
and Tile Co., Sanford, NC, Compliance Testing, Entropy Environmentalists,
Inc., Research Triangle Park, NC, February 1978.
15. R. N. Doster and D. J. Grove, Stationary Source Sampling Report: Lee Brick
and Tile Co., Sanford, NC, Compliance Testing, Entropy Environmentalists,
Inc., Research Triangle Park, NC, June 1978.
10/86 Mineral Products Industry 8.3-7
-------
16. F. J. Phoenix and D. J. Grove, Stationary Source Sampling Report - Chatham
Brick and Tile Co., Sanford, NC, Partlculate Emissions Compliance Testing,
Entropy Environmentalists, Inc., Research Triangle Park, NC, July 1979.
17. Fine Particle Emissions Information System, Series Report No. 354, Office
Of Air Quality Planning And Standards, U. S. Environmental Protection
Agency, Research Triangle Park, NC, June 1983.
.3-8 EMISSION FACTORS 10/86
-------
8.6 PORTLAND CEMENT MANUFACTURING
8.6.1 Process Descriptionl~3
Portland cement manufacture accounts for about 95 percent of the cement
production in the United States. The more than 30 raw materials used to make
cement may be divided into four basic components: line (calcareous), silica
(siliceous), alumina (argillaceous), and iron (ferriferous). Approximately
1575 kilograms (3500 pounds) of dry raw materials are required to produce 1
metric ton (2200 pounds of cement). Between 45 and 65 percent of raw material
weight is removed as carbon dioxide and water vapor. As shown in Figure 8.6-1,
the raw materials undergo separate crushing after the quarrying operation, and,
when needed for processing, are proportioned, ground and blended by either a
dry or wet process. One barrel of cement weighs 171 kilograms (376 pounds).
In the dry process, moisture content of the raw material is reduced to less
than 1 percent, either before or during grinding. The dried materials are then
pulverized and fed directly into a rotary kiln. The kiln is a long steel cylin-
der with a refractory brick lining. It is slightly inclined, rotating about
the longitudinal axis. The pulverized raw materials are fed into the upper end,
traveling slowly to the lower end. Kilns are fired from the lower end, so that
the rising hot gases pass through the raw material. Drying, decarbonating and
calcining are accomplished as the material travels through the heated kiln and
finally burns to incipient fusion and forms the clinker. The clinker is cooled,
mixed with about 5 weight percent gypsum and ground to the desired fineness.
The product, cement, is then stored for later packaging and shipment.
With the wet process, a slurry is made by adding water to the initial
grinding operation. Proportioning may take place before or after the grinding
step. After the materials are mixed, excess water is removed and final adjust-
ments are made to obtain a desired composition. This final homogeneous mixture
is fed to the kilns as a slurry of 30 to 40 percent moisture or as a wet fil-
trate of about 20 percent moisture. The burning, cooling, addition of gypsum,
and storage are then carried out, as in the dry process.
The trend in the Portland cement industry is toward the use of the dry
process of clinker production. Eighty percent of the kilns built since 1971
use the dry process, compared to 46 percent of earlier kilns. Dry process kilns
that have become subject to new source performance standards (NSPS) since 1979
commonly are either preheater or preheater/precalciner systems. Both systems
allow the sensible heat in kiln exhast gases to heat, and partially to calcine,
the raw feed before it enters the kiln.
Addition of a preheater to a dry process kiln permits use of a kiln one
half to two thirds shorter than those without a preheater, because heat transfer
to the dry feed is more efficient in a preheater than in the preheating zone of
the kiln.^ Also, because of the increased heat transfer efficiency, a preheater
kiln system requires less energy than either a wet kiln or a dry kiln without a
preheater to achieve the same amount of calcination. Wet raw feed (of 20 to 40
percent moisture) requires a longer residence time for preheating, which is
best provided in the kiln itself. Therefore, wet process plants do not use
10/86 Mineral Products Industry 8.6-1
-------
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preheater systems. A dry process kiln with a preheater system can use 50
percent less fuel than a wet process kiln.
8.6.2 Emissions And Controls*"*^,5
Particulate matter is the primary emission in the manufacture of Portland
cement. Emissions also include the normal combustion products of the fuel used
for heat in the kiln and in drying operations, including oxides of nitrogen and
small amounts of oxides of sulfur.
Sources of dust at cement plants are 1) quarrying and crushing, 2) raw
material storage, 3) grinding and blending (dry process only), 4) clinker pro-
duction and cooling, 5) finish grinding, and 6) packaging. The largest single
point of emissions is the kiln, which may be considered to have three units,
the feed system, the fuel firing system, and the clinker cooling and handling
system. The most desirable method of disposing of the dust collected by an
emissions control system is injection into the kiln burning zone for inclusion
in the clinker. If the alkali content of the raw materials is too high, how-
ever, some of the dust is discarded or treated before its return to the kiln.
The maximum alkali content of dust that can be recycled is 0.6 percent (calcu-
lated as sodium oxide). Additional sources of dust emissions are quarrying,
raw material and clinker storage piles, conveyors, storage silos, loading/
unloading facilities, and paved/unpaved roads.
The complications of kiln burning and the large volumes of material handled
have led to the use of many control systems for dust collection. The cement
industry generally uses mechanical collectors, electric precipitators, fabric
filter (baghouse) collectors, or combinations of these to control emissions.
To avoid excessive alkali and sulfur buildup in the raw feed, some systems
have an alkali bypass exhaust gas system added between the kiln and the preheat-
er. Some of the kiln exhaust gases are ducted to the alkali bypass before the
preheater, thus reducing the alkali fraction passing through the feed. Particu-
late emissions from the bypass are collected by a separate control device.
Tables 8.6-1 through 8.6-4 give emission factors for cement manufacturing,
including factors based on particle size. Size distributions for particulate
emissions from controlled and uncontrolled kilns and clinker coolers are also
shown in Figures 8.6-2 and 8.6-3.
Sulfur dioxide (SC^) may come from sulfur compounds in the ores and in the
fuel combusted. The sulfur content of both will vary from plant to plant and
from region to region. Information on the efficacy of particulate control
devices on S02 emissions from cement kilns is inconclusive. This is because of
variability of factors such as feed sulfur content, temperature, moisture, and
feed chemical composition. Control extent will vary, of course, according to
the alkali and sulfur content of the raw materials and fuel."
Nitrogen oxides (NOX) are also formed during fuel combustion in rotary
cement kilns. The NOx emissions result from the oxidation of nitrogen in the
fuel (fuel NOx) as W£H as in incoming combustion air (thermal NOx). The quan-
tity of NOx formed depends on the type of fuel, its nitrogen content, combustion
temperature, etc. Like S02, a certain portion of the NC^ reacts with the alka-
line cement and thus is removed from the gas stream.
10/86 Mineral Products Industry 8.6-3
-------
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8.6-4
EMISSION FACTORS
10/86
-------
TABLE 8.6-2. CONTROLLED PARTICULATE EMISSION FACTORS FOR
CEMENT MANUFACTURING3
Type
of
source
Wet process kiln
Dry process kiln
Clinker cooler
Control
technology
Baghouse
ESP
Multiclone
Multicyclone
+ ESP
Baghouse
Gravel bed
filter
ESP
Baghouse
Particulate
kg/Mg
clinker
0.57
0.39
130b
0.34
0.16
0.16
0.048
0.010
Ib/ton
clinker
1.1
0.78
260b
0.68
0.32
0.32
0.096
0.020
Emission
Factor
Rating
C
C
D
C
B
C
D
C
Primary limestone
crusher0 Baghouse
Primary limestone
screen0 Baghouse
Secondary limestone
screen and crusher0 Baghouse
Conveyor transfer0 Baghouse
Raw mill system0^ Baghouse
Finish mill system6 Baghouse
0.00051
0.00011
0.00016
0.000020
0.034
0.017
0.0010
0.00022
0.00032
0.000040
0.068
0.034
D
D
D
C
aReference 8. Expressed as kg particulate/Mg (Ib particulate/ton) of clinker
produced, except as noted. ESP = electrostatic precipitator.
bfiased on a single test of a dry process kiln fired with a combination of
coke and natural gas. Not generally applicable to a broad cross section
of the cement industry.
°Expressed as mass of pollutant/mass of raw material processed.
"Includes mill, air separator and weigh feeder.
elncludes mill, air separator(s) and one or more material transfer operations.
Expressed in terms of units of cement produced.
10/86
Mineral Products Industry
8.6-5
-------
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8.6-6
EMISSION FACTORS
10/86
-------
1000.0
s
J
s
o
o
LU
UJ
£ -o
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°
§
3
3
u
100.0
10.0
1.0
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i i i irr
T
O Uncontrolled Wet Process Kiln
*2) Uncontrolled Dry Process Kiln
*§) Dry Process Kiln with Multiclone
Wet Process Kiln with ESP
Dry Process Kiln with Baghouse
i i i il
i iii
100.0
10.0 jj
0.1
0.01
o t-
3 «
LU C
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Aerodynamic Particle Diameter (^tmA)
Figure 8.6-2. Size specific emission factors for cement kilns.
10/86
Mineral Products Industry
8.6-7
-------
1
10.Or:
100
.s
o
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3
cr
LU
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-------
TABLE 8.6-4.
SIZE SPECIFIC EMISSION FACTORS FOR
CLINKER COOLERS3
EMISSION FACTOR RATING:
Particle
sizeb
(urn)
2.5
5.0
10.0
15.0
20.0
Total mass
Cumulative mass %
< stated
sizec
Uncontrolled Gravel bed filter
0.54
1.5
8.6
21
34
emission factor
40
64
76
84
89
Cumulative emission factor
< stated sized
Uncontrolled
kg/Mg
0.025
0.067
0.40
0.99
1.6
4.6e
Ib/ton
0.050
0.13
0.80
2.0
3.2
9.2e
Gravel bed filter
kg/Mg
0.064
0.10
0.12
0.13
0.14
0.16f
Ib/ton
0.13
0.20
0.24
0.26
0.28
0.32f
aReference 8.
bAerodynamic diameter
cRounded to two significant figures.
dUnit weight of pollutant/unit weight of clinker
produced. Rounded to two significant figures.
eFrom Table 8.6-1.
fFrom Table 8.6-2.
References for Section 8.6
1. T. E. Kreichelt, et al. , Atmospheric Emissions from the Manufacture of
Portland Cement, 999-AP-17, U. S. Environmental Protection Agency,
Cincinnati, OH, 1967.
2. Background Information For Proposed New Source Performance Standards:
Portland Cement Plants, APTD-0711, U. S. Environmental Protection Agency,
Research Triangle Park, NC, August 1971.
3. A Study of the Cement Industry in the State of Missouri, Resources Research,
Inc., Reston, VA, December 1967.
4. Portland Cement Plants - Background Information for Proposed Revisions
to Standards, EPA-450/3-85-003a, U. S. Environmental Protection Agency.
Research Triangle Park, NC, May 1985.
5. Standards of Performance for New Stationary Sources, 36 FR 28476,
December 23, 1971.
6- Particulate Pollutant System Study, EPA Contract No. CPA-22-69-104, Midwest
Research Institute, Kansas City, MO, May 1971.
10/86
Mineral Products Industry
8.6-9
-------
7. Restriction of Emissions from Portland Cement Works, VDI Richtlinien,
Duesseldorf, West Germany, February 1967.
8. J. S. Kinsey, Lime and Cement Industry - Source Category Report, Vol. II,
EPA Contract No. 68-02-3891, Midwest Research Institute, Kansas City, MO,
August 14, 1986.
8.6-10 EMISSION FACTORS 10/86
-------
8.10 CONCRETE BATCHING
8.10.1 Process Description^"^
Concrete is composed essentially of water, cement, sand (fine aggregate)
and coarse aggregate. Coarse aggregate may consist of gravel, crushed stone
or iron blast furnace slag. Some specialty aggregate products could be either
heavyweight aggregate (of barite, magnetite, limonite, ilmenite, iron or steel)
or lightweight aggregate (with sintered clay, shale, slate, diatomaceous shale,
perlite, vermiculite, slag, pumice, cinders, or sintered fly ash). Concrete
batching plants store, convey, measure and discharge these constituents into
trucks for transport to a job site. In some cases, concrete is prepared at a
building construction site or for the manufacture of concrete products such as
pipes and prefabricated construction parts. Figure 8.10-1 is a generalized
process diagram for concrete batching.
The raw materials can be delivered to a plant by rail, truck or barge.
The cement is transferred to elevated storage silos pneumatically or by bucket
elevator. The sand and coarse aggregate are transferred to elevated bins by
front end loader, clam shell crane, belt conveyor, or bucket elevator. From
these elevated bins, the constituents are fed by gravity or screw conveyor to
weigh hoppers, which combine the proper amounts of each material.
Truck mixed (transit mixed) concrete involves approximately 75 percent of
U. S. concrete batching plants. At these plants, sand, aggregate, cement and
water are all gravity fed from the weigh hopper into the mixer trucks. The
concrete is mixed on the way to the site where the concrete is to be poured.
Central mix facilities (including shrink mixed) constitute the other one fourth
of the industry. With these, concrete is mixed and then transferred to either
an open bed dump truck or an agitator truck for transport to the job site.
Shrink mixed concrete is concrete that is partially mixed at the central mix
plant and then completely mixed in a truck mixer on the way to the job site.
Dry batching, with concrete is mixed and hauled to the construction site in dry
form, is seldom, if ever, used.
8.10-2 Emissions and Controls^"?
Emission factors for concrete batching are given in Table 8.10-1, with
potential air pollutant emission points shown. Particulate matter, consisting
primarily of cement dust but including some aggregate and sand dust emissions,
is the only pollutant of concern. All but one of the emission points are
fugitive in nature. The only point source is the transfer of cement to the
silo, and this is usually vented to a fabric filter or "sock". Fugitive sources
include the transfer of sand and aggregate, truck loading, mixer loading,
vehicle traffic, and wind erosion from sand and aggregate storage piles. The
amount of fugitive emissions generated during the transfer of sand and aggregate
depends primarily on the surface moisture content of these materials. The
extent of fugitive emission control varies widely from plant to plant.
10/86 Mineral Products Industry 8.10-1
-------
en
to
-------
TABLE 8.10-1.
UNCONTROLLED PARTICIPATE EMISSION FACTORS
FOR CONCRETE BATCHING
Source
Sand and aggregate transfer
to elevated blnb
Cement unloading to elevated
storage silo
Pneuraat icc
Bucket elevator''
Weigh hopper loading6
Truck loading (truck mix)6
Mixer loading (central mlx)e
Vehicle traffic (unpaved road)^
Wind erosion from sand
and aggregate storage piles'1
Total process emissions
(truck mix)3
kg/Mg
of
material
0.014
0.13
0.12
0.01
0.01
0.02
4.5 kg/VKT
3.9 kg/
hectare/day
0.05
Ib/ton
of
material
0.029
0.27
0.24
0.02
0.02
0.04
16 Ib/VMT
3.5 lb/
acre/day
0.10
lb/yd3
of
concrete3
0.05
0.07
0.06
0.04
0.04
0.07
0.28
O.I1
0.20
Emission
Factor
Rating
E
D
E
E
E
E
C
D
E
aBased on a typical yd3 weighing 1.818 kg (4,000 lb) and containing 227 kg
(500 lb) cement, 564 kg (1,240 lb) sand, 864 kg (1,900 lb) coarse aggregate
and 164 kg (360 lb) water.
bReference 6.
cFor uncontrolled emissions measured before filter. Based on two tests on
pneumatic conveying controlled by a fabric filter.
^Reference 7. From test of mechanical unloading to hopper and subsequent
transport of cement by enclosed bucket elevator to elevated bins with
fabric socks over bin vent.
6Reference 5. Engineering judgement, based on observations and emission
tests of similar controlled sources.
fFrom Section 11.2.1, with k - 0.8, s » 12, S - 20, W - 20, w = 14, and p -
100. VKT = vehicle kilometers traveled. VMT = vehicle miles traveled.
gBased on facility producing 23,100 m3/yr (30,000 yd3/yr), with average truck
load of 6.2m3 (8 yd3) and plant road length of 161 meters (1/10 mile).
hprom Section 8.19.1, for emissions <30 um for Inactive storage piles.
iAssumes 1,011 ra2 (1/4 acre) of sand and aggregate storage at plant with
production of 23,100 m3/yr (30,000 yd3/yr).
JBased on pneumatic conveying of cement at a truck mix facility. Does not
include vehicle traffic or wind erosion from storage piles.
10/86
Mineral Products Industry
8.10-3
-------
Types of controls used may include water sprays, enclosures, hoods, cur-
tains, shrouds, movable and telescoping chutes, and the like. A major source
of potential emissions, the movement of heavy trucks over unpaved or dusty
surfaces in and around the plant, can be controlled by good maintenance and
wetting of the road surface.
Predictive equations which allow for emission factor adjustment based on
plant specific conditions are given in Chapter 11. Whenever plant specific
data are available, they should be used in lieu of the fugitive emission factors
presented in Table 8.10-1.
References for Section 8.10
1. Air Pollutant Emission Factors, APTD-0923, U. S. Environmental Protection
Agency, Research Triangle Park, NC, April 1970.
2. Air Pollution Engineering Manual, 2nd Edition, AP-40, U. S. Environmental
Protection Agency, Research Triangle Park, NC, 1974. Out of Print.
3. Telephone and written communication between Edwin A. Pfetzing, Pedco
Environmental, Inc., Cincinnati, OH, and Richard Morris and Richard
Meininger, National Ready Mix Concrete Association, Silver Spring, MD, May
1984.
4. Development Document for Effluent Limitations Guidelines and Standards of
Performance, The Concrete Products Industries, Draft, U. S. Environmental
Protection Agency, Washington, DC, August 1975.
5. Technical Guidance for Control of Industrial Process Fugitive Particulate
Emissions, EPA-450/3-77-010, U. S. Environmental Protection Agency,
Research Triangle Park, NC, March 1977.
6. Fugitive Dust Assessment at Rock and Sand Facilities in the South Coast
Air Basin, Southern California Rock Products Association and Southern
California Ready Mix Concrete Association, Santa Monica, CA, November
1979.
7. Telephone communication between T. R. Blackwood, Monsanto Research Corp.,
Dayton, OH, and John Zoller, Pedco Environmental, Inc., Cincinnati, OH,
October 18, 1976.
8.10-4 EMISSION FACTORS 10/86
-------
8.13 GLASS MANUFACTURING
8.13.1 General1"5
Commercially produced glass can be classified as soda-lime, lead, fused
silica, borosilicate, or 96 percent silica. Soda-lime glass, since it con-
stitutes 77 percent of total glass production, is discussed here. Soda-lime
glass consists of sand, limestone, soda ash, and cullet (broken glass). The
manufacture of such glass is in four phases: (1) preparation of raw material,
(2) melting in a furnace, (3) forming and (4) finishing. Figure 8.13-1 is a
diagram for typical glass manufacturing.
The products of this industry are flat glass, container glass, and press-
ed and blown glass. The procedures for manufacturing glass are the same for
all products except forming and finishing. Container glass and pressed and
blown glass, 51 and 25 percent respectively of total soda-lime glass pro-
duction, use pressing, blowing or pressing and blowing to form the desired
product. Flat glass, which is the remainder, is formed by float, drawing or
rolling processes.
As the sand, limestone and soda ash raw materials are received, they are
crushed and stored in separate elevated bins. These materials are then trans-
ferred through a gravity feed system to a weigher and mixer, where the mate-
rial is mixed with cullet to ensure homogeneous melting. The mixture is con-
veyed to a batch storage bin where it is held until dropped into the feeder
to the melting furnace. All equipment used in handling and preparing the raw
material is housed separately from the furnace and is usually referred to as
the batch plant. Figure 8.13-2 is a flow diagram of a typical batch plant.
FINISHING
FINISHING
RAW
MATERIAL
MELTING
FURNACE
GLASS
FORMING
ANNEALING
INSPECTION
AND
TESTING
CULLET '
CRUSHING
RECYCLE UNDESIRABLE
GLASS
PACKING
STORAGE
OR
SHIPPING
10/86
Figure 8.13-1. Typical glass manufacturing process.
Mineral Products Industry
8.13-1
-------
CULLET
RAD MATERIALS
RECEIVING
HOPPER
V
SCREV
CONVEYOR
FILTER
VENTS
STORAGE BINS
MAJOR RAD MATERIALS
BELT CONVEYOR
BATCH
STORAGE
BIN
FURNACE
FEEDER
GLASS
MELTING
FURNACE
i
Figure 8.13-2. General diagram of a batch plant.
The furnace most commonly used is a continuous regenerative furnace
capable of producing between 45 and 272 Mg (50 and 300 tons) of glass per
day. A furnace may have either side or end ports that connect brick checkers
to the inside of the melter. The purpose of brick checkers (Figures 8.13-3
and 4) is to conserve fuel by collecting furnace exhaust gas heat which, when
the air flow is reversed, is used to preheat the furnace combustion air. As
material enters the melting furnace through the feeder, it floats on the top
of the molten glass already in the furnace. As it melts, it passes to the
front of the melter and eventually flows through a throat leading to the
refiner. In the refiner, the molten glass is heat conditioned for delivery
to the forming process. Figures 8.13-3 and 8.13-4 show side port and end
port regenerative furnaces.
After refining, the molten glass leaves the furnace through forehearths
(except in the float process, with molten glass moving directly to the tin
bath) and goes to be shaped by pressing, blowing, pressing and blowing, draw-
ing, rolling, or floating to produce the desired product. Pressing and blow-
ing are performed mechanically, using blank molds and glass cut into sections
(gobs) by a set of shears. In the drawing process, molten glass is drawn up-
ward in a sheet through rollers, with thickness of the sheet determined by the
speed of the draw and the configuration of the draw bar. The rolling process
is similar to the drawing process except that the glass is drawn horizontally
8.13-2
EMISSION FACTORS
10/86
-------
Figure 8.13-3. Side port continuous regenerative furnace,
REFINER SIDE tlU
INDUCED DRIFT F*N
Figure 8.13-4. End port continuous regenerative furnace.
10/86 Mineral Products Industry 8.13-3
-------
on plain or patterned rollers and, for plate glass, requires grinding and
polishing. The float process is different, having a molten tin bath over
which the glass is drawn and formed into a finely finished surface requiring
no grinding or polishing. The end product undergoes finishing (decorating or
coating) and annealing (removing unwanted stress areas in the glass) as re-
quired, and is then inspected and prepared for shipment to market. Any
damaged or undesirable glass is transferred back to the batch plant to be
used as cullet.
8.13.2 Emissions and Controls!"^
The main pollutant emitted by the batch plant is particulates in the form
of dust. This can be controlled with 99 to 100 percent efficiency by enclos-
ing all possible dust sources and using baghouses or cloth filters. Another
way to control dust emissions, also with an efficiency approaching 100 percent,
is to treat the batch to reduce the amount of fine particles present, by pre-
sintering, briquetting, pelletizing, or liquid alkali treatment.
The melting furnace contributes over 99 percent of the total emissions
from a glass plant, both particulates and gaseous pollutants. Particulates
result from volatilization of materials in the melt that combine with gases
and form condensates. These either are collected in the checker work and gas
passages or are emitted to the atmosphere. Serious problems arise when the
checkers are not properly cleaned, in that slag can form, clog the passages
and eventually deteriorate the condition and efficiency of the furnace.
Nitrogen oxides form when nitrogen and oxygen react in the high temperatures
of the furnace. Sulfur oxides result from the decomposition of the sulfates
in the batch and sulfur in the fuel. Proper maintenance and firing of the
furnace can control emissions and also add to the efficiency of the furnace
and reduce operational costs. Low pressure wet centrifugal scrubbers have
been used to control particulate and sulfur oxides, but their inefficiency
(approximately 50 percent) indicates their inability to collect particulates
of submicron size. High energy venturi scrubbers are approximately 95 percent
effective in reducing particulate and sulfur oxide emissions. Their effect on
nitrogen oxide emissions is unknown. Baghouses, with up to 99 percent parti-
culate collection efficiency, have been used on small regenerative furnaces,
but fabric corrosion requires careful temperature control. Electrostatic pre-
cipitators have an efficiency of up to 99 percent in the collection of par-
ticulates. Table 8.13-1 lists controlled and uncontrolled emission factors
for glass manufacturing. Table 8.13-2 presents particle size distributions
and corresponding emission factors for uncontrolled and controlled glass
melting furnaces.
Emissions from the forming and finishing phase depend upon the type of
glass being manufactured. For container, press, and blow machines, the ma-
jority of emissions results from the gob coming into contact with the machine
lubricant. Emissions, in the form of a dense white cloud which can exceed 40
percent opacity, are generated by flash vaporization of hydrocarbon greases
and oils. Grease and oil lubricants are being replaced by silicone emulsions
and water soluble oils, which may virtually eliminate this smoke. For flat
glass, the only contributor to air pollutant emissions is gas combustion in
the annealing lehr (oven), which is totally enclosed except for product entry
and exit openings. Since emissions are small and operational procedures are
efficient, no controls are used on flat glass processes.
8.13-4 EMISSION FACTORS 10/86
-------
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10/86
Mineral Products Industry
8.13-5
-------
UNCONTROLLED
—•— Weight percent
Emission factor
CONTROLLED
—•— Weight percent
5 * 7 S 9 10 20 )0 40 SO 60 •'0 30 90 ,.00
Particle diameter, um
Figure 8.13-5. Particle size distributions and emission factors for
glass melting furnace exhaust.
TABLE 8.13-2. PARTICLE SIZE DISTRIBUTIONS AND EMISSION FACTORS
FOR UNCONTROLLED AND CONTROLLED MELTING FURNACES
IN GLASS MANUFACTURING3
Emission Factor Rating: E
Aerodynamic
particle
diameter, um
2.5
6.0
10
Particle size
Uncontrolled
91
93
95
distributionb
ESP
Controlledd
53
66
75
Size specific emission
factor, kg/Mgc
Uncontrolled
0.64
0.65
0.66
References 8-11.
^Cumulative weight % of particles < corresponding particle size.
cBased on mass particulate emission factor of 0.7 kg/Mg glass produced, from
Table 8.13-1. Size specific emission factor = mass particulate emission
factor x particle size distribution, %/100. After ESP control, size specific
emission factors are negligible.
"^Reference 8-9. Based on a single test.
8.13-6
EMISSION FACTORS
10/86
-------
References for Section 8.13
1. J. A. Danielson, (ed.), Air Pollution Engineering Manual, 2nd Ed.,
AP-40, U. S. Environmental Protection Agency, Research Triangle Park,
NC, May 1973. Out of Print.
2. Richard B. Reznik, Source Assessment; Flat Glass Manufacturing Plants,
EPA-600/20-76-032b, U. S. Environmental Protection Agency, Research
Triangle Park, NC, March 1976.
3. J. R. Schoor, et al., Source Assessment: Glass Container Manufacturing
Plants, EPA-600/2-76-269, U. S. Environmental Protection Agency,
Washington, DC, October 1976.
4. A. B. Tripler, Jr. and G. R. Smithson, Jr., A Review of Air Pollution
Problems and Control in the Ceramic Industries, Battelle Memorial Insti-
tute, Columbus, OH, presented at the 72nd Annual Meeting of the American
Ceramic Society, May 1970.
5. J. R. Schorr, et al., Source Assessment; Pressed and Blown Glass Manu-
facturing Plants, EPA-600/77-005, U. S. Environmental Protection Agency,
Washington, DC, January 1977.
6. Control Techniques for Lead Air Emissions, EPA-450/2-77-012, U. S. Environ-
mental Protection Agency, Research Triangle Park, NC, December 1977.
7. Confidential test data, Pedco-Environmental Specialists, Inc., Cincinnati,
OH.
8. H. J. Taback, Fine Particle Emissions from Stationary and Miscellaneous
Sources in the South Coast Air Basin, PB-293-923, National Technical
Information Service, Springfield, VA, February 1979.
9. Emission test data from Environmental Assessment Data Systems, Fine Par-
ticle Emission Information System (FPEIS), Series Report No. 219, U. S.
Environmental Protection Agency, Research Triangle Park, NC, June 1983.
10. Environmental Assessment Data Systems, op. cit., Series No. 223.
11. Environmental Assessment Data Systems, op. cit. , Series No. 225.
10/86 Mineral Products Industry 8.13-7
-------
8.15 LIME MANUFACTURING
8.15.1 General1'4
Lime is the high temperature product of the calcination of limestone.
There are two kinds, high calcium lime (CaO) and dolomitic lime (CaO • MgO).
Lime is manufactured in various kinds of kilns by one of the following
reactions:
CaC03 + heat -* C02 + CaO (high calcium lime)
CaC03 • MgC03 + heat •* C02 + CaO • MgO (dolomitic lime)
In some lime plants, the resulting lime is reacted (slaked) with water to
form hydrated lime.
The basic processes in the production of lime are 1) quarrying raw
limestone; 2) preparing limestone for the kilns by crushing and sizing;
3) calcining limestone; 4) processing the lime further by hydrating; and
5) miscellaneous transfer, storage and handling operations. A general-
ized material flow diagram for a lime manufacturing plant is given in Fig-
ure 8.15-1. Note that some operations shown may not be performed in all
plants.
The heart of a lime plant is the kiln. The prevalent type of kiln is
the rotary kiln, accounting for about 90 percent of all lime production in
the United States. This kiln is a long, cylindrical, slightly inclined, re-
fractory lined furnace, through which the limestone and hot combustion gases
pass countercurrently. Coal, oil and natural gas may all be fired in rotary
kilns. Product coolers and kiln feed preheaters of various types are com-
monly used to recover heat from the hot lime product and hot exhaust gases,
respectively.
The next most common type of kiln in the United States is the vertical,
or shaft, kiln. This kiln can be described as an upright heavy steel cylin-
der lined with refractory material. The limestone is charged at the top and
is calcined as it descends slowly to discharge at the bottom of the kiln. A
primary advantage of vertical kilns over rotary kilns is higher average fuel
efficiency. The primary disadvantages of vertical kilns are their rela-
tively low production rates and the fact that coal cannot be used without
degrading the quality of the lime produced. There have been few recent
vertical kiln installations in the United States because of high product
quality requirements.
Other, much less common, kiln types include rotary hearth and fluidized
bed kilns. Both kiln types can achieve high production rates, and neither
can operate with coal. The "calcimatic" kiln, or rotary hearth kiln, is a
circular shaped kiln with a slowly revolving donut shaped hearth. In fluid-
ized bed kilns, finely divided limestone is brought into contact with hot
combustion air in a turbulent zone, usually above a perforated grate. Be-
cause of the amount of lime carryover into the exhaust gases, dust collec-
tion equipment must be installed on fluidized bed kilns for process economy.
10/86 Mineral Products Industry 8.15-1
-------
Hign Caicium and Doioniitic Lmetrone I
Quorry and Mine Operation*
(Drilling, Blasting, and Conveying
of Broken Limestone)
;. > ...
(OD) - Go»n Cuft Sourc<
- ProcMj Fugitive Sourc*
4 Sourc*
©-
(ODH
^—'
Max Siz> 0.64- 1.3 cm
Hian Calcium I Ooiomitic
.and Oolomitlc •• I Quickl
Ouiciclim* Lvy>.^Jon\ 3nlr
Ground ond Pu(v«nz«d
Quickltm*
Hyarator
-I Stoaratar
Hign Calcium and Daiomitie * "^["nri^
Normal hvorof«d Umt ; \ /
Figure 8.15-1. Simplified flow diagram for lime and limestone products.
8.15-2
EMISSION FACTORS
10/86
-------
About 10 percent of all lime produced is converted to hydrated (slaked)
lime. There are two kinds of hydrators, atmospheric and pressure. Atmo-
spheric hydrators, the more prevalent type, are used in continuous mode to
produce high calcium and normal dolomitic hydrates. Pressure hydrators, on
the other hand, produce only a completely hydrated dolomitic lime and oper-
ate only in batch mode. Generally, water sprays or wet scrubbers perform
the hydrating process, to prevent product loss. Following hydration, the
product may be milled and then conveyed to air separators for further drying
and removal of coarse fractions.
In the United States, lime plays a major role in chemical and metal-
lurgical operations. Two of the largest uses are as steel flux and in
alkali production. Lesser uses include construction, refractory and agri-
cultural applications.
8.15.2 Emissions And Controls3"5
Potential air pollutant emission points in lime manufacturing plants
are shown in Figure 8.15-1. Except for gaseous pollutants emitted from
kilns, particulate is the only pollutant of concern from most of the opera-
tions .
The largest ducted source of particulate is the kiln. Of the various
kiln types, fluidized beds have the most uncontrolled particulate emissions,
because of the very small feed size combined with high air flow through
these kilns. Fluidized bed kilns are well controlled for maximum product
recovery. The rotary kiln is second worst in uncontrolled particulate emis-
sions, also because of the small feed size and relatively high air veloci-
ties and dust entrainment caused by the rotating chamber. The calcimatic
(rotary hearth) kiln ranks third in dust production, primarily because of
the larger feed size and the fact that, during calcination, the limestone
remains stationary relative to the hearth. The vertical kiln has the lowest
uncontrolled dust emissions, due to the large lump feed and the relatively
low air velocities and slow movement of material through the kiln.
Some sort of particulate control is generally applied to most kilns.
Rudimentary fallout chambers and cyclone separators are commonly used for
control of the larger particles. Fabric and gravel bed filters, wet (com-
monly venturi) scrubbers, and electrostatic precipitators are used for sec-
ondary control.
Nitrogen oxides, carbon monoxide and sulfur oxides are all produced in
kilns, although the last are the only gaseous pollutant emitted in signifi-
cant quantities. Not all of the sulfur in the kiln fuel is emitted as sul-
fur oxides, since some fraction reacts with the materials in the kiln. Some
sulfur oxide reduction is also effected by the various equipment used for
secondary particulate control.
Product coolers are emission sources only when some of their exhaust
gases are not recycled through the kiln for use as combustion air. The
10/86 Mineral Products Industry 8.15-3
-------
trend is away from the venting of product cooler exhaust, however, to maxi-
mize fuel use efficiencies. Cyclones, baghouses and wet scrubbers have been
employed on coolers for particulate control.
Hydrator emissions are low, because water sprays or wet scrubbers are
usually installed to prevent product loss in the exhaust gases. Emissions
from pressure hydrators may be higher than from the more common atmospheric
hydrators, because the exhaust gases are released intermittently, making
control more difficult.
Other particulate sources in lime plants include primary and secondary
crushers, mills, screens, mechanical and pneumatic transfer operations,
storage piles, and roads. If quarrying is a part of the lime plant opera-
tion, particulate may also result from drilling and blasting. Emission
factors for some of these operations are presented in Sections 8.20 and 11.2
of this document.
Controlled and uncontrolled emission factors and particle size data for
lime manufacturing are given in Tables 8.15-1 through 8.15-3. The size dis-
tributions of particulate emissions from controlled and uncontrolled rotary
kilns and uncontrolled product loading operations are shown in Figures
8.15-2 and 8.15-3.
.15-4 EMISSION FACTORS 10/86
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10/86
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8.15-10
EMISSION FACTORS
10/86
-------
References for Section 8.15
1. C. J. Lewis and B. B. Crocker, "The Lime Industry's Problem Of Airborne
Dust", Journal Of The Air Pollution Control Association, 19(1):31-39,
January 1969.
2. Kirk-Othmer Encyclopedia Of Chemical Technology, 2d Edition, John Wiley
And Sons, New York, 1967.
3. Screening Study For Emissions Characterization From Lime Manufacture,
EPA Contract No. 68-02-0299, Vulcan-Cincinnati, Inc., Cincinnati, OH,
August 1974.
4. Standards Support And Environmental Impact Statement, Volume I; Proposed
Standards Of Performance For Lime Manufacturing Plants, EPA-450/2-77-
007a, U. S. Environmental Protection Agency, Research Triangle Park,
NC, April 1977.
5. Source test data on lime plants, Office Of Air Quality Planning And
Standards, U. S. Environmental Protection Agency, Research Triangle Park,
NC, 1976.
6. Air Pollutant Emission Factors, APTD-0923, U. S. Environmental Protection
Agency, Research Triangle Park, NC, April 1970.
7. J. S. Kinsey, Lime And Cement Industry - Source Category Report, Volume
I: Lime Industry, EPA-600/7-86-031, U. S. Environmental Protection
Agency, Cincinnati, OH, September 1986.
10/86 Mineral Products Industry 8.15-11
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Mineral Products Industry
8.19.2-5
-------
specific source conditions, these equations should be used instead of those in
Table 8.19.2-2, whenever emission estimates applicable to specific stone quarry-
ing and processing facility sources are needed. Chapter 11.2 provides measured
properties of crushed limestone, as required for use in the predictive emission
factor equations.
References for Section 8.19.2
1. Air Pollution Control Techniques for Nonmetallic Minerals Industry,
EPA-450/3-82-014, U. S. Environmental Protection Agency, Research
Triangle Park, NC, August 1982.
2. P. K. Chalekode, et al., Emissions from the Crushed Granite Industry;
State of the Art, EPA-600/2-78-021, U. S. Environmental Protection
Agency, Washington, DC, February 1978.
3. T. R. Blackwood, et al., Source Assessment; Crushed Stone, EPA-600/2-78-
004L, U. S. Environmental Protection Agency, Washington, DC, May 1978.
4. F. Record and W. T. Harnett, Particulate Emission Factors for the
Construction Aggregate Industry, Draft Report, GCA-TR-CH-83-02, EPA
Contract No. 68-02-3510, GCA Corporation, Chapel Hill, NC, February 1983.
5. Review Emission Data Base and Develop Emission Factors for the Con-
struction Aggregate Industry, Engineering-Science, Inc., Arcadia, CA,
September 1984.
6. C. Cowherd, Jr., et al., Development of Emission Factors for Fugitive Dust
Sources, EPA-450/3-74-037, U. S. Environmental Protection Agency, Research
Triangle Park, NC, June 1974.
7. R. Bohn, et al., Fugitive Emissions from Integrated Iron and Steel Plants,
EPA-600/2-78-050, U. S. Environmental Protection Agency, Washington, DC,
March 1978.
8.19.2-6 EMISSION FACTORS 9/85
-------
8.22 TACONITE ORE PROCESSING
8.22.1 General l~2
More than two thirds of the iron ore produced in the United States con-
sists of taconite, a low grade iron ore largely from deposits in Minnesota
and Michigan, but from other areas as well. Processing of taconite consists
of crushing and grinding the ore to liberate ironbearing particles, concen-
trating the ore by separating the particles from the waste material (gangue),
and pelletizing the iron ore concentrate. A simplified flow diagram of these
processing steps is shown in Figure 8.22-1.
Liberation - The first step in processing crude taconite ore is crushing and
grinding. The ore must be ground to a particle size sufficiently close to
the grain size of the ironbearing mineral to allow for a high degree of
mineral liberation. Most of the taconite used today requires very fine
grinding. The grinding is normally performed in three or four stages of dry
crushing, followed by wet grinding in rod mills and ball mills. Gyratory
crushers are generally used for primary crushing, and cone crushers are used
for secondary and tertiary fine crushing. Intermediate vibrating screens
remove undersize material from the feed to the next crusher and allow for
closed circuit operation of the fine crushers. The rod and ball mills are
also in closed circuit with classification systems such as cyclones. An
alternative is to feed some coarse ores directly to wet or dry semiautogenous
or autogenous (using larger pieces of the ore to grind/mill the smaller pieces)
grinding mills, then to pebble or ball mills. Ideally, the liberated particles
of iron minerals and barren gangue should be removed from the grinding circuits
as soon as they are formed, with larger particles returned for further grinding.
Concentration - As the iron ore minerals are liberated by the crushing steps,
the ironbearing particles must be concentrated. Since only about 33 percent
of the crude taconite becomes a shippable product for iron making, a large
amount of gangue is generated. Magnetic separation and flotation are most
commonly used for concentration of the taconite ore.
Crude ores in which most of the recoverable iron is magnetite (or, in
rare cases, maghemite) are normally concentrated by magnetic separation. The
crude ore may contain 30 to 35 percent total iron by assay, but theoretically
only about 75 percent of this is recoverable magnetite. The remaining iron
is discarded with the gangue.
Nonmagnetic taconite ores are concentrated by froth flotation or by a
combination of selective flocculation and flotation. The method is determined
by the differences in surface activity between the iron and gangue particles.
Sharp separation is often difficult.
Various combinations of magnetic separation and flotation may be used to
concentrate ores containing various iron minerals (magnetite and hematite, or
maghemite) and wide ranges of mineral grain sizes. Flotation is also often
used as a final polishing operation on magnetic concentrates.
10/86 Mineral Products Industry 8.22-1
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EMISSION FACTORS
10/86
-------
Pallatization - Iron ore concentrates must be coarser than about No. 10
mesh to be acceptable as blast furnace feed without further treatment. The
finer concentrates are agglomerated into small "green" pellets. This is
normally accomplished by tumbling moistened concentrate with a balling drum
or balling disc. A binder, usually powdered bentonite, may be added to the
concentrate to improve ball formation and the physical qualities of the
"green" balls. The bentonite is lightly mixed with the carefully moistened
feed at 5 to 10 kilograms per megagram (10 to 20 Ib/ton).
The pellets are hardened by a procedure called induration, the drying
and heating of the green balls in an oxidizing atmosphere at incipient fu-
sion temperature of 1290 to 1400°C (2350 to 2550°F), depending on the compo-
sition of the balls, for several minutes and then cooling. Four general
types of indurating apparatus are currently used. These are the vertical
shaft furnace, the straight grate, the circular grate and grate/kiln. Most
of the large plants and new plants use the grate/kiln. Natural gas is most
commonly used for pellet induration now, but probably not in the future.
Heavy oil is being used at a few plants, and coal may be used at future
plants.
In the vertical shaft furnace, the wet green balls are distributed
evenly over the top of the slowly descending bed of pellets. A rising
stream of hot gas of controlled temperature and composition flows counter to
the descending bed of pellets. Auxiliary fuel combustion chambers supply
hot gases midway between the top and bottom of the furnace. In the straight
grate apparatus, a continuous bed of agglomerated green pellets is carried
through various up and down flows of gases at different temperatures. The
grate/kiln apparatus consists of a continuous traveling grate followed by
a rotary kiln. Pellets indurated by the straight grate apparatus are cooled
on an extension of the grate or in a separate cooler. The grate/kiln product
must be cooled in a separate cooler, usually an annular cooler with counter-
current airflow.
8.22.2 Emissions and Controls^
Emission sources in taconite ore processing plants are indicated in
Figure 8.22-1. Particulate emissions also arise from ore mining operations.
Emission factors for the major processing sources without controls are pre-
sented in Table 8.22-1, and control efficiencies in Table 8.22-2. Table
8.22-3 presents data on particle size distributions and corresponding size-
specific emission factors for the controlled main waste gas stream from
taconite ore pelletizing operations.
The taconite ore is handled dry through the crushing stages. All
crushers, size classification screens and conveyor transfer points are major
points of particulate emissions. Crushed ore is normally wet ground in rod
and ball mills. A few plants, however, use dry autogenous or semi-autogenous
grinding and have higher emissions than do conventional plants. The ore
remains wet through the rest of the beneficiation process (through concentrate
storage, Figure 8.22-1) so particulate emissions after crushing are generally
insignificant.
The first source of emissions in the pelletizing process is the trans-
fer and blending of bentonite. There are no other significant emissions in
10/86 Mineral Products Industry 8.22-3
-------
TABLE 8.22-1. PARTICULATE EMISSION FACTORS FOR
TACONITE ORE PROCESSING, WITHOUT CONTROLSa
EMISSION FACTOR RATING: D
Emissions*'
Source kg/Mg Ib/ton
Ore transfer
Coarse crushing and screening
Fine crushing
Bentonite transfer
Bentonite blending
Grate feed
Indurating furnace waste gas
Grate discharge
Pellet handling
0.05
0.10
39.9
0.02
0.11
0.32
14.6
0.66
1.7
0.10
0.20
79.8
0.04
0.22
0.64
29.2
1.32
3.4
aReference 1. Median values.
^Expressed as units per unit weight of pellets produced.
the balling section, since the iron ore concentrate is normally too wet to
cause appreciable dusting. Additional emission points in the pelletizing
process include the main waste gas stream from the indurating furnace, pellet
handling, furnace transfer points (grate feed and discharge), and for plants
using the grate/kiln furnace, annular coolers. In addition, tailings basins
and unpaved roadways can be sources of fugitive emissions.
Fuel used to fire the indurating furnace generates low levels of sulfur
dioxide emissions. For a natural gas fired furnace, these emissions are about
0.03 kilograms of S02 per megagram of pellets produced (0.06 Ib/ton). High-
er S02 emissions (about 0.06 to 0.07 kg/Mg, or 0.12 to 0.14 Ib/ton) would
result from an oil or coal fired furnace.
Particulate emissions from taconite ore processing plants are controlled
by a variety of devices, including cyclones, multiclones, rotoclones, scrub-
bers, baghouses and electrostatic precipitators. Water sprays are also used
to suppress dusting. Annular coolers are generally left uncontrolled because
their mass loadings of particulates are small, typically less than 0.11 grams
per normal cubic meter (0.05 gr/scf).
The largest source of particulate emissions in taconite ore mines is
traffic on unpaved haul roads.4 Table 8.22-4 presents size specific emission
factors for this source determined through source testing at one taconite
mine. Other significant particulate emission sources at taconite mines are
wind erosion and blasting.^
As an alternative to the single valued emission factors for open dust
sources given in Tables 8.22-1 and 8.22-4, empirically derived emission
8-22-4 EMISSION FACTORS 10/86
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10/86
Mineral Products Industry
8.22-5
-------
s „
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Particle dlaaeter, ua
JO 40 50 60 70 80 90 100
Figure 8.22-3. Particle size distributions and size specific emission
factors for indurating furnace waste gas stream from
taconite ore pelletizing.
TABLE 8.22-3.
PARTICLE SIZE DISTRIBUTIONS AND SIZE SPECIFIC EMISSION FACTORS
FOR CONTROLLED INDURATING FURNACE WASTE GAS STREAM FROM
TACONITE ORE PELLETIZING3
SIZE-SPECIFIC EMISSION FACTOR RATING: D
Particle size distribution*5
Size specific emission
Aerodynamic
particle
diameter, um
2.5
6.0
10.0
Cyclone
controlled
17.4
25.6
35.2
Cyclone/ESP
controlled
48.0
71.0
81.5
factor,
Cyclone
controlled
0.16
0.23
0.31
kg/MgC
Cyclone/ESP
controlled
0.012
0.018
0.021
^Reference 3. ESP = electrostatic precipitator. After cyclone control,
mass emission factor is 0.89 kg/Mg, and after cyclone/ESP control, 0.025
kg/Mg. Mass and size specific emission factors are calculated from data
in Reference 3, and are expressed as kg particulate/Mg of pellets produced.
^Cumulative weight % < particle diameter.
cSize specific emission factor = mass emission factor x particle size
distribution, %/100.
8.22-6
EMISSION FACTORS
10/86
-------
TABLE 8.22-4. UNCONTROLLED EMISSION FACTORS FOR HEAVY DUTY VEHICLE
TRAFFIC ON HAUL ROADS AT TACONITE MINES3
Surface Emission factor by aerodynamic diameter Emission
material (urn) Units Factor
<30 £15 <10 <5 <2.5 Rating
Crushed rock
and glacial
till 3.1
11.0
Crushed taconite
and waste 2.6
9.3
2.2 1.7 1.1 0.62 kg/VKT
7.9 6.2 3.9 2.2 Ib/VMT
1.9 1.5 0.9 0.54 kg/VKT
6.6 5.2 3.2 1.9 Ib/VMT
C
C
D
D
aReference 4. Predictive emission factor equations, which provide
generally more accurate estimates, are in Chapter 11. VKT = vehicle
kilometers travelled. VMT = vehicle miles travelled.
factor equations are presented in Chapter 11 of this document. Each equation
has been developed for a source operation defined by a single dust generating
mechanism, common to many industries, such as vehicle activity on unpaved
roads. The predictive equation explains much of the observed variance in mea-
sured emission factors by relating emissions to parameters which characterize
source conditions. These parameters may be grouped into three categories,
1) measures of source activity or energy expended, i. e., the speed and weight
of a vehicle on an unpaved road; 2) properties of the material being disturbed,
i. e. , the content of suspendable fines in the surface material of an unpaved
road; and 3) climatic parameters, such as the number of precipitation free days
per year, when emissions tend to a maximum.
Because the predictive equations allow for emission factor adjustment to
specific source conditions, such equations should be used in place of the
single valued factors for open dust sources in Tables 8.22-1 and 8.22-4, when-
ever emission estimates are needed for sources in a specific taconite ore mine
or processing facility. One should remember that the generally higher quality
ratings assigned to these equations apply only if 1) reliable values of correc-
tion parameters have been determined for the specific sources of interest, and
2) the correction parameter values lie within the ranges tested in developing
the equations. In the event that site specific values are not available,
Chapter 11 lists measured properties of road surface and aggregate process
materials found in taconite mining and processing facilities, and these can be
used to estimate correction parameter values for the predictive emission factor
equations. The use of mean correction parameter values from Chapter 11 reduces
the quality ratings of the factor equations by one level.
10/86
Mineral Products Industry
8.22-7
-------
References for Section 8.22
1. J. P. Pilney and G. V. Jorgensen, Emissions from Iron Ore Mining,
Beneficiation and Pelletization, Volume 1, EPA Contract No. 68-02-2113,
Midwest Research Institute, Minnetonka, MN, June 1983.
2. A. K. Reed, Standard Support and Environmental Impact Statement for
the Iron Ore Beneficiation Industry (Draft), EPA Contract No. 68-02-
1323, Battelle Columbus Laboratories, Columbus, OH, December 1976.
3. Air Pollution Emission Test, Empire Mining Company, Palmer, MI, EMB-
76-IOB-2, U. S. Environmental Protection Agency, Research Triangle
Park, NC, November 1975.
4. T. A. Cuscino, et al., Taconite Mining Fugitive Emissions Study,
Minnesota Pollution Control Agency, Roseville, MN, June 1979.
i
I
8.22-8 EMISSION FACTORS 10/86
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10/86
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The equations were developed through field sampling of various western surface
mine types and are thus applicable to any of the surface coal mines located in
the western United States.
In Tables 8.24-1 and 8.24-2, the assigned quality ratings apply within
the ranges of source conditions that were tested in developing the equations,
given in Table 8.24-3. However, the equations are derated one letter value
(e. g., A to B) if applied to eastern surface coal mines.
TABLE 8.24-3. TYPICAL VALUES FOR CORRECTION FACTORS APPLICABLE TO THE
PREDICTIVE EMISSION FACTOR EQUATIONS3
Number
Source Correction of test
factor samples
Coal loading
Bulldozers
Coal
Overburden
Dragline
Scraper
Grader
Light/medium
duty vehicle
Haul truck
Moisture
Moisture
Silt
Moisture
Silt
Drop distance
M II
Moisture
Silt
Weight
Speed
Moisture
Wheels
Silt loading
7
3
3
8
8
19
7
10
15
7
7
29
26
Range Geometric
mean
6.6 -
4.0 -
6.0 -
2.2 -
3.8 -
1.5 -
5 -
0.2 -
7.2 -
33 -
36 -
8.0 -
5.0 -
0.9 -
6.1 -
3.8 -
34 -
38
22.0
11.3
16.8
15.1
30
100
16.3
25.2
64
70
19.0
11.8
1.7
10.0
254
2270
17.8
10.4
8.6
7.9
6.9
8.6
28.1
3.2
16.4
48.8
53.8
11.4
7.1
1.2
8.1
40.8
364
Units
%
%
%
%
7
/a
m
ft
%
%
Mg
ton
kph
mph
7
^
number
g/m2
Ib/ac
aReference
In using the equations to estimate emissions from sources found in a
specific western surface mine, it is necessary that reliable values for
correction parameters be determined for the specific sources of interest,
if the assigned quality ranges of the equations are to be applicable.
For example, actual silt content of coal or overburden measured at a facility
I
8.24-6
EMISSION FACTORS
10/86
-------
10.0 WOOD PRODUCTS INDUSTRY
Wood processing involves the conversion of raw wood to pulp, pulpboard or
types of wallboard such as plywood, particle board or hardboard. This chapter
presents emissions data on chemical wood pulping, on pulpboard and plywood manu-
facturing, and on woodworking operations. The burning of wood waste in boilers
and conical burners is discussed in Chapters 1 and 2 of this publication.
10/86 Wood Products Industry 10-1
-------
10.1 CHEMICAL WOOD PULPING
10.1.1 General
Chemical wood pulping involves
dissolving the lignin that binds the
cesses principally used in chemical
semichemical (NSSC), and soda. The
for causing air pollution. The kraft
cent of the chemical pulp produced in
process is determined by the desired
and by economic considerations.
10.1.2 Kraft Pulping
the extraction of cellulose from wood by
cellulose fibers together. The four pro-
pulping are kraft, sulfite, neutral sulfite
ffirst three display the greatest potential
process alone accounts for over 80 per-
the United States. The choice of pulping
product, by the wood species available,
Process Description-'- - The kraft
involves the digesting of wood chips
"white liquor", which is a water solu
The white liquor chemically dissolves
together.
There are two types of digester
pulping is done in batch digesters,
of continuous digesters. In a batch
contents of the digester are transfer
to as a blow tank. The entire conten
washers, where the spent cooking liqu
then proceeds through various stages
which it is pressed and dried into th
digester does not apply to continuous
The balance of the kraft process
pulping process (See Figure 10.1-1)
•at elevated temperature and pressure in
ion of sodium sulfide and sodium hydroxide.
the lignin that binds the cellulose fibers
systems, batch and continuous. Most kraft
although the more recent installations are
digester, when cooking is complete, the
ed to an atmospheric tank usually referred
:s of the blow tank are sent to pulp
>r is separated from the pulp. The pulp
f washing, and possibly bleaching, after
finished product. The "blow" of the
digester systems.
is designed to recover the cooking
chemicals and heat. Spent cooking liquor and the pulp wash water are combined
to form a weak black liquor which is concentrated in a multiple effect evaporator
system to about 55 percent solids. The black liquor is then further concentrated
to 65 percent solids in a direct contact evaporator, by bringing the liquor
into contact with the flue gases from the recovery furnace, or in an indirect
contact concentrator. The strong black liquor is then fired in a recovery
furnace. Combustion of the organics dissolved in the black liquor provides
heat for generating process steam and for converting sodium sulfate to sodium
sulfide. Inorganic chemicals present in the black liquor collect as a molten
smelt at the bottom of the furnace.
The smelt is dissolved in water to form green liquor, which is transferred
to a causticizing tank where quicklime (calcium oxide) is added to convert the
solution back to white liquor for return to the digester system. A lime mud
precipitates from the causticizing tank, after which it is calcined in a lime
kiln to regenerate quicklime.
10/86
Wood Products Industry
10.1-1
-------
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10.1-2
EMISSION FACTORS
10/86
-------
For process heating, for driving equipment, for providing electric power,
etc., many mills need more steam than can be provided by the recovery furnace
alone. Thus, conventional industrial boilers that burn coal, oil, natural gas,
or bark and wood are commonly used.
Emissions And Controls^"? - Particulate emissions from the kraft pro-
cess occur largely from the recovery furnace, the lime kiln and the smelt dis-
solving tank. These emissions are mainly sodium salts, with some calcium salts
from the lime kiln. They are caused mostly by carryover of solids and sublima-
tion and condensation of the inorganic chemicals.
Particulate control is provided on recovery furnaces in a variety of ways.
In mills with either a cyclonic scrubber or cascade evaporator as the direct
contact evaporator, further control is necessary, as these devices are generally
only 20 to 50 percent efficient for particulates. Most often in these cases,
an electrostatic precipitator is employed after the direct contact evaporator,
for an overall particulate control efficiency of from 85 to more than 99 percent,
Auxiliary scrubbers may be added at existing mills after a precipitator or a
venturi scrubber to supplement older and less efficient primary particulate
control devices.
Particulate control on lime kilns is generally accomplished by scrubbers.
Electrostatic precipitators have been used in a few mills. Smelt dissolving
tanks usually are controlled by mesh pads, but scrubbers can provide further
control.
The characteristic odor of the kraft mill is caused by the emission of
reduced sulfur compounds, the most common of which are hydrogen sulfide, methyl
mercaptan, dimethyl sulfide and dimethyl disulfide, all with extremely low odor
thresholds. The major source of hydrogen sulfide is the direct contact evapo-
rator, in which the sodium sulfide in the black liquor reacts with the carbon
dioxide in the furnace exhaust. Indirect contact evaporators can significantly
reduce the emission of hydrogen sulfide. The lime kiln can also be a potential
source of odor, as a similar reaction occurs with residual sodium sulfide in
the lime mud. Lesser amounts of hydrogen sulfide are emitted with the noncon-
densible offgasses from the digesters and multiple effect evaporators.
Methyl mercaptan and dimethyl sulfide are formed in reactions with the
wood component, lignin. Dimethyl disulfide is formed through the oxidation of
mercaptan groups derived from the lignin. These compounds are emitted from
many points within a mill, but the main sources are the digester/blow tank
systems and the direct contact evaporator.
Although odor control devices, per se, are not generally found in kraft
mills, emitted sulfur compounds can be reduced by process modifications and
improved operating conditions. For example, black liquor oxidation systems,
which oxidize sulfides into less reactive thiosulfates, can considerably reduce
odorous sulfur emissions from the direct contact evaporator, although the vent
gases from such systems become minor odor sources themselves. Also, noncon-
densible odorous gases vented from the digester/blow tank system and multiple
effect evaporators can be destroyed by thermal oxidation, usually by passing
them through the lime kiln. Efficient operation of the recovery furnace, by
avoiding overloading and by maintaining sufficient oxygen, residence time and
turbulence, significantly reduces emissions of reduced sulfur compounds from
10/86 Wood Products Industry 10.1-3
-------
this source as well. The use of fresh water instead of contaminated condensates
in the scrubbers and pulp washers further reduces odorous emissions.
Several new mills have incorporated recovery systems that eliminate the
conventional direct contact evaporators. In one system, heated combustion air,
rather than fuel gas, provides direct contact evaporation. In another, the
multiple effect evaporator system is extended to replace the direct contact
evaporator altogether. In both systems, sulfur emissions from the recovery
furnace/direct contact evaporator can be reduced by more than 99 percent.
Sulfur dioxide is emitted mainly from oxidation of reduced sulfur compounds
in the recovery furnace. It is reported that the direct contact evaporator
absorbs about 75 percent of these emissions, and further scrubbing can provide
additional control.
Potential sources of carbon monoxide emissions from the kraft process
include the recovery furnace and lime kilns. The major cause of carbon monoxide
emissions is furnace operation well above rated capacity, making it impossible
to maintain oxidizing conditions.
Some nitrogen oxides also are emitted from the recovery furnace and lime
kilns, although amounts are relatively small. Indications are that nitrogen
oxide emissions are on the order of 0.5 and 1.0 kilograms per air dried mega-
grams (1 and 2 Ib/air dried ton) of pulp produced from the lime kiln and
recovery furnace, respectively.^~6
A major source of emissions in a kraft mill is the boiler for generating
auxiliary steam and power. The fuels used are coal, oil, natural gas or bark/
wood waste. See Chapter 1 for emission factors for boilers.
Table 10.1-1 presents emission factors for a conventional kraft mill.
The most widely used particulate control devices are shown, along with the odor
reductions through black liquor oxidation and incineration of noncondensible
offgases. Tables 10.1-2 through 10.1-7 present cumulative size distribution
data and size specific emission factors for particulate emissions from sources
within a conventional kraft mill. Uncontrolled and controlled size specific
emission factors^ are presented in Figures 10.1-2 through 10.1-7. The particle
sizes presented are expressed in terms of the aerodynamic diameter.
10.1.3 Acid Sulfite Pulping
Process Description - The production of acid sulfite pulp proceeds
similarly to kraft pulping, except that different chemicals are used in the
cooking liquor. In place of the caustic solution used to dissolve the lignin
in the wood, sulfurous acid is employed. To buffer the cooking solution, a
bisulfite of sodium, magnesium, calcium or ammonium is used. A diagram of a
typical magnesium base process is shown in Figure 10.1-8.
Digestion is carried out under high pressure and high temperature, in
either batch mode or continuous digesters, and in the presence of a sulfurous
acid/bisulfite cooking liquid. When cooking is completed, either the digester
is discharged at high pressure into a blow pit, or its contents are pumped into
a dump tank at a lower pressure. The spent sulfite liquor (also called red
liquor) then drains through the bottom of the tank and is treated and discarded,
10.1-4
EMISSION FACTORS 10/86
-------
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-------
TABLE 10.1-2. CUMULATIVE PARTICLE SIZE DISTRIBUTION AND SIZE SPECIFIC
EMISSION FACTORS FOR A RECOVERY BOILER WITH A DIRECT
CONTACT EVAPORATOR AND AN ESPa
EMISSION FACTOR RATING: C
Particle size
(urn)
15
10
6
2.5
1.25
1.00
0.625
Total
Cumulative mass % <
stated size
Uncontrolled
95.0
93.5
92.2
83.5
56.5
45.3
26.5
100
Controlled
-
68.2
53.8
40.5
34.2
22.2
100
Cumulative emission factor
(kg/Mg of air dried pulp)
Uncontrolled
86
84
83
75
51
41
24
90
Controlled
—
0.7
0.5
0.4
0.3
0.2
1.0
aReference 7. Dash = no data
100
90 -
80
70
60
50
40
30
20
10
0
0.1
Uncontrolled
Controlled
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
8-=
1.0 10
Particle diameter (pm)
100
Figure 10.1-2. Cumulative particle size distribution and
specific emission factors for recovery boiler
with direct contact evaporator and ESP.
size
10.1-6
EMISSION FACTORS
10/86
-------
TABLE 10.1-3. CUMULATIVE PARTICLE SIZE DISTRIBUTION AND SIZE SPECIFIC
EMISSION FACTORS FOR A RECOVERY BOILER WITHOUT A DIRECT
CONTACT EVAPORATOR BUT WITH AN ESPa
EMISSION FACTOR RATING: C
Particle size
(urn)
15
10
6
2.5
1.25
1.00
0.625
Total
Cumulative mass % <
stated size
Uncontroll ed
_
-
-
78.0
40.0
30.0
17.0
100
Controlled
78.8
74.8
71.9
67.3
51.3
42.4
29.6
100
Cumulative emission factor
(kg/Mg of air dried pulp)
Uncontrolled
_
-
-
90
46
35
20
115
Controlled
0.8
0.7
0.7
0.6
0.5
0.4
0.3
1.0
aReference 7. Dash = no data.
150
J-q 100
i.!:
50
0.1
Controlled
Uncontrolled
I I I 1 I I 111
I I 1 I I I I 11
I I 1 I I I 1 I
1.0 10
Particle diameter (\un)
100
1.0
0.9
0.8
0.7
0.6
0.5
0.3
0.2
0.1
0
is
Figure 10.1-3. Cumulative particle size distribution and
specific emission factors for recovery boiler without direct
evaporator but with ESP.
size
contact
10/86
Wood Products Industry
10.1-7
-------
TABLE 10.1-4. CUMULATIVE PARTICLE SIZE DISTRIBUTION AND SIZE SPECIFIC
EMISSION FACTORS FOR A LIME KILN WITH A VENTURI SCRUBBER3
EMISSION FACTOR RATING: C
Particle size
(urn)
15
10
6
2.5
1.25
1.00
0.625
Total
Cumulative mass % <
stated size
Uncontrolled
27.7
16.8
13.4
10.5
8.2
7.1
3.9
100
Controlled
98.9
98.3
98.2
96.0
85.0
78.9
54.3
100
Cumulative emission factor
(kg/Mg of air dried pulp)
Uncontrolled
7.8
4.7
3.8
2.9
2.3
2.0
1.1
28.0
Controlled
0.24
0.24
0.24
0.24
0.21
0.20
0.14
0.25
aReference 7.
30
I!
20
Controlled
Uncontrolled
0.1
1.0 10
Particle diameter
0.3
i i i i m11 1—i i i 11111. 1—i i i 11'''°
0.2
Figure 10.1-4. Cumulative particle size distribution and size
specific emission factors for lime kiln with venturi scrubber.
10.1-8
EMISSION FACTORS
10/86
-------
TABLE 10.1-5. CUMULATIVE PARTICLE SIZE DISTRIBUTION AND SIZE SPECIFIC
EMISSION FACTORS FOR A LIME KILN WITH AN ESP3
EMISSION FACTOR RATING: C
Particle size
(urn)
15
10
6
2.5
1.25
1.00
0.625
Total
Cumulative mass % <
stated size
Uncontrolled
27.7
16.8
13.4
10.5
8.2
7.1
3.9
100
Controlled
91.2
88.5
86.5
83.0
70.2
62.9
46.9
100
Cumulative emission factor
(kg/Mg of air dried pulp)
Uncontrolled
7.8
4.7
3.8
2.9
2.3
2.0
1.1
28.0
Controlled
0.23
0.22
0.22
0.21
0.18
0.16
0.12
0.25
aRef erence 7 .
30
20
-* 10
0.1
Controlled
Uncontrolled
1.0 10
Particle diameter (urn)
0.3
I
i l i i il il 0
100
Figure 10.1-5. Cumulative particle size distribution and size
specific emission factors for lime kiln with ESP.
10/86
Wood Products Industry
10.1-9
-------
TABLE 10.1-6. CUMULATIVE PARTICLE SIZE DISTRIBUTION AND SIZE SPECIFIC
EMISSION FACTORS FOR A SMELT DISSOLVING TANK WITH A
PACKED TOWERa
EMISSION FACTOR RATING: C
Particle size
(urn)
15
10
6
2.5
1.25
1.00
0.625
Total
Cumulative mass % <
stated size
Uncontrolled
90.0
88.5
87.0
73.0
47.5
40.0
25.5
100
Controlled
95.3
95.3
94.3
85.2
63.8
54.2
34.2
100
Cumulative emission factor
(kg/Mg of air dried pulp)
Uncontrolled
3.2
3.1
3.0
2.6
1.7
1.4
0.9
3.5
Controlled
0.48
0.48
0.47
0.43
0.32
0.27
0.17
0.50
aReference 7.
ii 3
is;
0.6
0.1
Controlled
Uncontrolled
0.5
0.4
0.3 =£
0.1
1.0 10
Particle diameter (vm)
100
Figure 10.1-6. Cumulative particle size distribution and size
specific emission factors for smelt dissolving tank with
packed tower.
10.1-10
EMISSION FACTORS
10/86
-------
TABLE 10.1-7. CUMULATIVE PARTICLE SIZE DISTRIBUTION AND SIZE SPECIFIC
EMISSION FACTORS FOR A SMELT DISSOLVING TANK WITH A
VENTURI SCRUBBER3
EMISSION FACTOR RATING: C
Particle size
(urn)
15
10
6
2.5
1.25
1.00
0.625
Total
Cumulative mass % <
stated size
Uncontrolled
90.0
88.5
87.0
73.0
47.5
54.0
25.5
100
Controlled
89.9
89.5
88.4
81.3
63.5
54.7
38.7
100
Cumulative emission factor
(kg/Mg of air dried pulp)
Uncontrolled
3.2
3.1
3.0
2.6
1.7
1.4
0.9
3.5
Controlled
0.09
0.09
0.09
0.08
0.06
0.06
0.04
0.09
aReference 7.
0.1
Controlled
Uncontrolled
1.0 10
Particle diameter (vim)
1.0
0.9
0.8
0.7 £„
S^
ZE.
0.6 ^-o
-IS
"S-<-
0.4 2 °
s€
c^
0.3 oi.
t_>
0.2
0.1
0
100
Figure 10.1-7. Cumulative particle size distribution and size
specific emission factors for smelt dissolving tank with
venturi scrubber.
10/86
Wood Products Industry
10.1-11
-------
CO
CO
(U
o
o
0)
CO
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00
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00
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Pn
10.1-12
EMISSION FACTORS
10/86
-------
incinerated, or sent to a plant for recovery of heat and chemicals. The pulp
is then washed and processed through screens and centrifuges to remove knots,
bundles of fibers and other material. It subsequently may be bleached, pressed
and dried in papermaking operations.
Because of the variety of cooking liquor bases used, numerous schemes have
evolved for heat and/or chemical recovery. In calcium base systems, found most-
ly in older mills, chemical recovery is not practical, and the spent liquor is
usually discharged or incinerated. In ammonium base operations, heat can be
recovered by combusting the spent liquor, but the ammonium base is thereby con-
sumed. In sodium or magnesium base operations, the heat, sulfur and base all
may be feasibly recovered.
If recovery is practiced, the spent (weak) red liquor (which contains more
than half of the raw materials as dissolved organic solids) is concentrated in
a multiple effect evaporator and a direct contact evaporator to 55 to 60 per-
cent solids. This strong liquor is sprayed into a furnace and burned, pro-
ducing steam to operate the digesters, evaporators, etc. and to meet other
power requirements.
When magnesium base liquor is burned, a flue gas is produced from which
magnesium oxide is recovered in a multiple cyclone as fine white power. The
magnesium oxide is then water slaked and is used as circulating liquor in a
series of venturi scrubbers, which are designed to absorb sulfur dioxide from
the flue gas and to form a bisulfite solution for use in the cook cycle. When
sodium base liquor is burned, the inorganic compounds are recovered as a molten
smelt containing sodium sulfide and sodium carbonate. This smelt may be pro-
cessed further and used to absorb sulfur dioxide from the flue gas and sulfur
burner. In some sodium base mills, however, the smelt may be sold to a nearby
kraft mill as raw material for producing green liquor.
If liquor recovery is not practiced, an acid plant is necessary of suf-
ficient capacity to fulfill the mill's total sulfite requirement. Normally,
sulfur is burned in a rotary or spray burner. The gas produced is then cooled
by heat exhangers and a water spray and is then absorbed in a variety of dif-
ferent scrubbers containing either limestone or a solution of the base chemical.
Where recovery is practiced, fortification is accomplished similarly, although
a much smaller amount of sulfur dioxide must be produced to make up for that
lost in the process.
Emissions And Controls^- - Sulfur dioxide is generally considered the major
pollutant of concern from sulfite pulp mills. The characteristic "kraft" odor
is not emitted because volatile reduced sulfur compounds are not products of
the lignin/bisulfite reaction.
A major S02 source is the digester and blow pit (dump tank) system. Sul-
fur dioxide is present in the intermittent digester relief gases, as well as in
the gases given off at the end of the cook when the digester contents are dis-
charged into the blow pit. The quantity of sulfur dioxide evolved and emitted
to the atmosphere in these gas streams depends on the pH of the cooking liquor,
the pressure at which the digester contents are discharged, and the effective-
ness of the absorption systems employed for SC>2 recovery. Scrubbers can be
installed that reduce S02 from this source by as much as 99 percent.
10/86 Wood Products Industry 10.1-13
-------
Another source of sulfur dioxide emissions is the recovery system. Since
magnesium, sodium, and ammonium base recovery systems all use absorption systems
to recover SC>2 generated in recovery furnaces, acid fortification towers, mul-
tiple effect evaporators, etc., the magnitude of SC>2 emissions depends on the
desired efficiency of these systems. Generally, such absorption systems recover
better than 95 percent of the sulfur so it can be reused.
The various pulp washing, screening, and cleaning operations are also
potential sources of SC>2• These operations are numerous and may account for a
significant fraction of a mill's SC>2 emissions if not controlled.
The only significant particulate source in the pulping and recovery pro-
cess is the absorption system handling the recovery furnace exhaust. Ammonium
base systems generate less particulate than do magnesium or sodium base systems.
The combustion productions are mostly nitrogen, water vapor and sulfur dioxide.
Auxiliary power boilers also produce emissions in the sulfite pulp mill,
and emission factors for these boilers are presented in Chapter 1.
Table 10.1-8 contains emission factors for the various sulfite pulping
operations.
10.1.4 Neutral Sulfite Semichemical (NSSC) Pulping
Process Description"' 12-14 _ jn this method, wood chips are cooked in a
neutral solution of sodium sulfite and sodium carbonate. Sulfite ions react
with the lignin in wood, and the sodium bicarbonate acts as a buffer to maintain
a neutral solution. The major difference between all semichemical techniques
and those of kraft and acid sulfite processes is that only a portion of the
lignin is removed during the cook, after which the pulp is further reduced by
mechanical disintegration. This method achieves yields as high as 60 to 80
percent, as opposed to 50 to 55 percent for other chemical processes.
The NSSC process varies from mill to mill. Some mills dispose of their
spent liquor, some mills recover the cooking chemicals, and some, when operated
in conjunction with kraft mills, mix their spent liquor with the kraft liquor
as a source of makeup chemcials. When recovery is practiced, the involved
steps parallel those of the sulfite process.
Emissions And Controls^,12-14 _ Particulate emissions are a potential prob-
lem only when recovery systems are involved. Mills that do practice recovery
but are not operated in conjunction with kraft operations often utilize fluid-
ized bed reactors to burn their spent liquor. Because the flue gas contains
sodium sulfate and sodium carbonate dust, efficient particulate collection may
be included for chemical recovery.
A potential gaseous pollutant is sulfur dioxide. Absorbing towers, diges-
ter/blower tank system, and recovery furnace are the main sources of S02, with
amounts emitted dependent upon the capability of the scrubbing devices installed
for control and recovery.
Hydrogen sulfide can also be emitted from NSSC mills which use kraft type
recovery furnaces. The main potential source is the absorbing tower, where a
10.1-14 EMISSION FACTORS 10/86
-------
TABLE 10.1-8. EMISSION FACTORS FOR SULFITE PULPING3
Source
Digester/blow pit or
dump tankc
Recovery system6
Acid plantf
Otherh
Base
All
MgO
MgO
MgO
MgO
NH3
NHj
Na
Ca
MgO
NH3
Na
NH3
Na
Ca
All
Control
None
Process change1*
Scrubber
Process change and
scrubber
All exhaust vented through
recovery system
Process change
Process change and
scrubber
Process change and
scrubber
Unknown
Multlcyclone and venturl
scrubbers
Ammonia absorption and
mist eliminator
Sodium carbonate scrubber
Scrubber
UnknownS
Jenssen scrubber
None
Emission factorb
Partlculate
kg/ADUMg
Neg
Neg
Neg
Neg
Neg
Neg
Neg
Neg
Neg
1
0.35
2
Neg
Neg
Neg
Neg
Ib/ADUT
Neg
Neg
Neg
Neg
Neg
Neg
Neg
Neg
Neg
2
0.7
4
Neg
Neg
Neg
Neg
Sulfur dioxide
kg/ADUMg
5 to 35
1 to 3
0.5
0.1
0
12.5
0.2
1
33.5
4.5
3.5
1
0.2
0.1
4
6
Ib/ADUT
10 to 70
2 to 6
1
0.2
0
25
0.4
2
67
9
7
2
0.3
0.2
8
12
Emission
Factor
Rating
C
C
B
B
A
D
B
C
C
A
B
C
C
D
C
D
aReference 11. All factors represent long term average emissions. ADUMg " Air dried unbleached megagram.
ADUT » Air dried unbleached ton. Neg » negligible.
''Expressed as kg (Ib) of pollutant/air dried unbleached ton (mg) of pulp.
cFactors represent emissions after cook is completed and when digester contents are discharged into blow pit or
dump tank. Some relief gases are vented from digester during cook cycle, but these are usually transferred to
pressure accumulators and S02 therein reabsorbed for use in cooking liquor. In some mills, actual emissions
will be intermittent and for short periods.
May include such measures as raising cooking liquor pH (thereby lowering free 802), relieving digester
pressure before contents discharge, and pumping out digester contents instead of blowing out.
eRecovery system at most mills is closed and includes recovery furnace, direct contact evaporator, multiple
effect evaporator, acid fortification tower, and S02 absorption scrubbers. Generally only one emission point
for entire system. Factors include high S02 emissions during periodic purging of recovery systems.
^Necessary in mills with insufficient or nonexistent recovery systems.
SControl is practiced, but -type of system is unknown.
^Includes miscellaneous pulping operations such as knotters, washers, screens, etc.
10/86
Wood Products Industry
10.1-15
-------
significant quantity of hydrogen sulfite is liberated as the cooking liquor is
made. Other possible sources, depending on the operating conditions, include
the recovery furnace, and in mills where some green liquor is used in the cook-
ing process, the digester/blow tank system. Where green liquor is used, it
is also possible that significant quantities of mercaptans will be produced.
Hydrogen sulfide emissions can be eliminated if burned to sulfur dioxide before
the absorbing system.
Because the NSSC process differs greatly from mill to mill, and because
of the scarcity of adequate data, no emission factors are presented for this
process.
References for Section 10.1
1 . Review of New Source Performance Standards for Kraft Pulp Mills, EPA-450/
3-83-017, U. S. Environmental Protection Agency, Research Triangle Park,
NC, September 1983.
2 . Standards Support and Environmental Impact Statement, Volume I: Proposed
Standards of Performance for Kraft Pulp Mills, EPA-450/2-76-014a, U. S.
Environmental Protection Agency, Research Triangle Park, NC, September
1976.
3. Kraft Pulping - Control of TRS Emissions from Existing Mills, EPA-450/78-
003b, U. S. Environmental Protection Agency, Research Triangle Park, NC,
March 1979.
4 . Environmental Pollution Control, Pulp and Paper Industry, Part I: Air,
EPA-625/7-76-001, U. S. Environmental Protection Agency, Washington, DC,
October 1976.
5. A Study of Nitrogen Oxides Emissions from Lime Kilns, Technical Bulletin
Number 107, National Council of the Paper Industry for Air and Stream
Improvement, New York, NY, April 1980.
6. A Study of Nitrogen Oxides Emissions from Large Kraft Recovery Furnaces,
Technical Bulletin Number 111, National Council of the Paper Industry for
Air and Stream Improvement, New York, NY, January 1981.
7. Source Category Report for the Kraft Pulp Industry, EPA Contract Number
68-02-3156, Acurex Corporation, Mountain View, CA, January 1983.
8. Source test data, Office Of Air Quality Planning And Standards, U. S.
Environmental Protection Agency, Research Triangle Park, NC, 1972.
9. Atmospheric Emissions from the Pulp and Paper Manufacturing Industry,
EPA-450/1-73-002, U. S. Environmental Protection Agency, Research Triangle
Park, NC, September 1973.
10. Carbon Monoxide Emissions from Selected Combustion Sources Based on Short-
Term Monitoring Records, Technical Bulleting Number 416, National Council
of the Paper Industry for Air and Stream Improvement, New York, NY,
January 1984.
10.1-16
EMISSION FACTORS 10/86
-------
11. Backgound Document; Acid Sulfite Pulping, EPA-450/3-77-005, U. S. Environ-
mental Protection Agency, Research Triangle Park, NC, January 1977.
12. E. R. Hendrickson, et al., Control of Atmospheric Emissions in the Wood
Pulping Industry, Volume I, HEW Contract Number CPA-22-69-18, U. S.
Environmental Protection Agency, Washington, DC, March 15, 1970.
13. M. Benjamin, et al., "A General Description of Commercial Wood Pulping and
Bleaching Processes", Journal of the Air Pollution Control Association, ^9_
(3):155-161, March 1969.
14. S. F. Galeano and B. M. Dillard, "Process Modifications for Air Pollution
Control in Neutral Sulfite Semi-chemical Mills", Journal of the Air Pollu-
tion Control Association. 22(3):195-199, March 1972.
10/86 Wood Products Industry 10.1-17
-------
11.2.6 INDUSTRIAL PAVED ROADS
11.2.6.1 General
Various field studies have indicated that dust emissions from industrial
paved roads are a major component of atmospheric particulate matter in the
vicinity of industrial operations. Industrial traffic dust has been found to
consist primarily of mineral matter, mostly tracked or deposited onto the
roadway by vehicle traffic itself when vehicles enter from an unpaved area or
travel on the shoulder of the road, or when material is spilled onto the paved
surface from haul truck traffic.
11.2.6.2 Emissions And Correction Parameters
The quantity of dust emissions from a given segment of paved road varies
linearly with the volume of traffic. In addition, field investigations have
shown that emissions depend on correction parameters (road surface silt content,
surface dust loading and average vehicle weight) of a particular road and
associated vehicle traffic.1'2
Dust emissions from industrial paved roads have been found to vary in
direct proportion to the fraction of silt (particles <75 microns in diameter) in
the road surface material.^"^ xhe silt fraction is determined by measuring the
proportion of loose dry surface dust that passes a 200 mesh screen, using the
ASTM-C-136 method. In addition, it has also been found that emissions vary in
direct proportion to the surface dust loading.1~2 -jhe road surface dust loading
is that loose material which can be collected by broom sweeping and vacuuming of
the traveled portion of the paved road. Table 11.2.6-1 summarizes measured silt
and loading values for industrial paved roads.
11.2.6.3 Predictive Emission Factor Equations
The quantity of total suspended particulate emissions generated by vehicle
traffic on dry industrial paved roads, per vehicle kilometer traveled (VKT) or
vehicle mile traveled (VMT) may be estimated, with a rating of B or D (see
below), using the following empirical expression^:
E ' °-022 ' °'' (kg/VKT) ("
°'7
where: E = emission factor
I = industrial augmentation factor (dimensionless) (see below)
n = number of traffic lanes
s = surface material silt content (%)
L = surface dust loading, kg/km (Ib/mile) (see below)
W = average vehicle weight, Mg (ton)
9/85 Miscellaneous Sources 11.2.6-1
-------
TABLE 11.2.6-1. TYPICAL SILT CONTENT AND LOADING VALUES FOR PAVED ROADS
AT INDUSTRIAL FACILITIES3
Industry
Copper smelting
Iron and steel
production
No. of
No. of No. of Silt (Zi w/w) Travel Total loading x 10~3
Sites Samples Range Mean lanes Range
1 3 [15.4-21.7] [19.0] 2 [12.9-19.5]
[45.8-69.2]
6 20 1.1-35.7 12.5 2 0.006-4.77
Mean
[15.9]
[55.4]
0.495
Units6
kg/km
Ib/mi
kg/km
Silt loading
Range Mean
[188-400] [292]
0.09-79 12
Iron and steel
production 6
Asphalt batching 1
Concrete batching 1
Sand and gravel
processing 1
20
3
3
3
1
[2
[5
[6
.1-35.7
.6-4.6]
.2-6.0]
.4-7.9]
12
[3
[5
[7
.5
.3]
.5)
•U
2 0.006-4.77
0.020-16.9
1 [12.1-18.0]
[43.0-64.0]
2 [1.4-1.8]
[5.0-6.4]
1 [2.8-5.5]
[9.9-19.4]
0.495
1.75
[14.
[52.
[1.
(5.
[3.
[13.
9]
8]
7]
9]
8]
3]
kg/km
Ib/mi
kg/km
Ib/mi
kg/km
Ib/ml
kg/km
Ib/mi
0.09-79
[76-193]
[11-12]
[53-95]
12
[120]
[12]
[70]
"References 1-5. Brackets indicate values based on only one plant test.
bMultlply entries by 1,000 to obtain stated units.
The industrial road augmentation factor (I) in the Equation 1 takes into
account higher emissions from industrial roads than from urban roads. I = 7.0
for an industrial roadway which traffic enters from unpaved areas. I = 3.5 for
an industrial roadway with unpaved shoulders where 20 percent of the vehicles
are forced to travel temporarily with one set of wheels on the shoulder. I =
1.0 for cases in which traffic does not travel on unpaved areas. A value
between 1.0 and 7.0 which best represents conditions for paved roads at a
certain industrial facility should be used for I in the equation.
The equation retains the quality rating of B if applied to vehicles
traveling entirely on paved surfaces (I = 1.0) and if applied within the range
of source conditions that were tested in developing the equation as follows:
Silt
content
(%)
5.1 - 92
Surface loading
kg /km
42.0 - 2000
Ib/mile
149 - 7100
No. of
lanes
2-4
Vehicle weight
Mg tons
2.7 - 12 3-13
If I is >1.0, the rating of the equation drops to D because of the subjectivity
in the guidelines for estimating I.
The quantity of fine particle emissions generated by traffic consisting
predominately of medium and heavy duty vehicles on dry industrial paved roads,
per vehicle unit of travel, may be estimated, with a rating of A, using the
I
11.2.6-2
EMISSION FACTORS
9/85
-------
APPENDIX B
(Reserved for future use.)
Appendix B B-l
-------
APPENDIX C.I
PARTICLE SIZE DISTRIBUTION DATA AND SIZED EMISSION FACTORS
FOR
SELECTED SOURCES
C.l-1
-------
C.l-2 EMISSION FACTORS
-------
CONTENTS
AP-42
Section Page
Introduction C. 1-5
1.8 Bagasse Boiler C.l-6
2.1 Refuse Incineration
Municipal Waste Mass Burn Incinerator C.l-8
Municipal Waste Modular Incinerator C.l-10
4.2 Automobile Spray Booth C.l-12
5.3 Carbon Black: Off Gas Boiler C.l-14
5.15 Detergent Spray Dryer TBA
5.17 Sulfuric Acid
Absorber C.l-18
Absorber, 20% Oleum C.l-20
Absorber, 32% Oleum C.l-22
Absorber, Secondary C.l-24
5.xx Boric Acid Dryer C.l-26
5.xx Potash Dryer
Potassium Chloride C.l-28
Potassium Sulfate C.l-30
6.1 Alfalfa Dehydrating - Primary Cyclone C.l-32
6.3 Cotton Ginning
Battery Condenser C.l-34
Lint Cleaner Air Exhaust C.l-36
Roller Gin Gin Stand TBA
Saw Gin Gin Stand TBA
Roller Gin Bale Press TBA
Saw Gin Bal e Press TBA
6.4 Feed And Grain Mills And Elevators
Carob Kibble Roaster C.l-44
Cereal Dryer C.l-46
Grain Unloading In Country Elevators C.l-48
Grain Conveying C.l-50
Rice Dryer C.l-52
6.18 Ammonium Sulfate Fertilizer Dryer C.l-54
7.1 Primary Aluminum Production
Bauxite Processing - Fine Ore Storage C.l-56
Bauxite Processing - Unloading From Ore Ship C.l-58
7.13 Steel Foundries
Castings Shakeout C.l-60
Open Hearth Exhaust C.l-62
7.15 Storage Battery Production
Grid Casting C.l-64
Grid Casting And Paste Mixing C.l-66
Lead Oxide Mill C.l-68
Paste Mixing; Lead Oxide Charging C.l-70
Three Process Operation C.1-72
7.xx Batch Tinner •. C.l-74
10/86 Appendix C.I C.l-3
-------
CONTENTS (cont.)
AP-42
Section Page
8.9 Coal Cleaning
Dry Process C.l-76
Thermal Dryer C. 1-78
Thermal Incinerator C.l-80
8.18 Phosphate Rock Processing
Calciner C.1-82
Dryer - Oil Fired Rotary And Fluidized Bed C.l-84
Dryer - Oil Fired Rotary C.l-86
Ball Mill C.l-88
Grinder - Roller And Bowl Mill C.l-90
8.xx Feldspar Ball Mill C.l-92
8.xx Fluorspar Ore Rotary Drum Dryer C.l-94
8.xx Lightweight Aggregate
Clay - Coal Fired Rotary Kiln C.l-96
Clay - Dryer C.l-98
Clay - Reciprocating Grate Clinker Cooler C.1-100
Shale - Reciprocating Grate Clinker Cooler C.1-102
Slate - Coal Fired Rotary Kiln C. 1-104
Slate - Reciprocating Grate Clinker Cooler C.1-106
8.xx Nonmetallic Minerals - Talc Pebble Mill C.1-108
10.4 Woodworking Waste Collection Operations
Belt Sander Hood Exhaust C.1-110
C.l-4 EMISSION FACTORS 10/86
-------
APPENDIX C.I
PARTICLE SIZE DISTRIBUTION DATA
AND
SIZED EMISSION FACTORS FOR SELECTED SOURCES
Introduction
This Appendix presents particle size distributions and emission factors
for miscellaneous sources or processes for which documented emission data were
available. Generally, the sources of data used to develop particle size
distributions and emission factors for this Appendix were:
1) Source test reports in the files of the Emission Measurement Branch
(EMB) of EPA's Emission Standards And Engineering Division, Office Of Air
Quality Planning And Standards.
2) Source test reports in the Fine Particle Emission Information System
(FPEIS), a computerized data base maintained by EPA's Air And Energy Engineer-
ing Research Laboratory, Office Of Research And Development.
3) A series of source tests titled Fine Particle Emissions From Station-
ary And Miscellaneous Sources In The South Coast Air Basin, by H. J. Taback.^
4) Particle size distribution data reported in the literature by various
individuals and companies.
Particle size data from FPEIS were mathematically normalized into more
uniform and consistent data. Where EMB tests and Taback report data were
filed in FPEIS, the normalized data were used in developing this Appendix.
Information on each source category in Appendix C.I is presented in a two
page format. For a source category, a graph provided on the first page presents
a particle size distribution expressed as the cumulative weight percent of
particles less than a specified aerodynamic diameter (cut point), in micro-
meters. A sized emission factor can be derived from the mathematical product
of a mass emission factor and the cumulative weight percent of particles smaller
than a specific cut point in the graph. At the bottom of the page is a table
of numerical values for particle size distributions and sized emission factors,
in micrometers, at selected values of aerodynamic particle diameter. The
second page gives some information on the data used to derive the particle size
distributions.
Portions of the Appendix denoted TEA in the table of contents refer to
information which will be added at a later date.
Appendix C.I C.l-5
-------
EXTERNAL COMBUSTION -
1.8 BAGASSE FIRED BOILER
99.99
99.9
99
98
95
"
90
0)
4-1
flj 80
03
V
bfl
70
60
50
40
30
20
,3 10
i
a <
2
1
0.5
0.1
0.01
CONTROLLED
—•— Weight percent
Emission factor
1.5
M
9
H-
05
cn
H.
o
3
i.o to
o
rr
O
0.5
0.0
3 4 5 4 7 8 9 10 20
Particle diameter, urn
30 40 50 60 70 80 90 100
Aerodynamic
particle
diameter, urn
2.5
6.0
10.0
Cumulative wt . % < stated size
Wet scrubber controlled
46.3
70.5
97.1
Emission factor, kg/Mg
Wet scrubber controlled
0.37
0.56
0.78
C.l-6
EMISSION FACTORS
10/86
-------
EXTERNAL COMBUSTION - 1.8 BAGASSE FIRED BOILER
NUMBER OF TESTS: 2, conducted after wet scrubber control
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 46.3 70.5 97.1
Standard deviation (Cum. %): 0.9 0.9 1.9
Min (Cum. %): 45.4 69.6 95.2
Max (Cum. %): 47.2 71.4 99.0
TOTAL PARTICULATE EMISSION FACTOR: Approximately 0.8 kg particulate/Mg bagasse
charged to boiler. This factor is derived from AP-42, Section 1.8, 4/77, which
states that the particulate emission factor from an uncontrolled bagasse fired
boiler is 8 kg/Mg and that wet scrubbers typically provide 90% particulate
control.
SOURCE OPERATION: Source is a Riley Stoker Corp. vibrating grate spreader
stoker boiler rated at 120,000 Ib/hr but operated during this testing at 121%
of rating. Average steam temperature and pressure were 579°F and 199 psig
respectively. Bagasse feed rate could not be measured, but was estimated to be
about 41 (wet) tons/hr.
SAMPLING TECHNIQUE: Anderson Cascade impactor.
EMISSION FACTOR RATING: D
REFERENCE:
Emission Test Report, U. S. Sugar Company, Bryant, Fl, EMB-80-WFB-6,
U. S. Environmental Protection Agency, Research Triangle Park, NC,
May 1980.
10/86 Appendix C.I C.l-7
-------
2.1 REFUSE INCINERATION: MUNICIPAL WASTE MASS BURN INCINERATOR
99.99
99.9
99
98
95
90
80
70
60
»•« 50
•U 40
f.
y 30
CO
V
0)
a
o
20
10
5
2
1
0.5
0.1
0.01
UNCONTROLLED
— Weight percent
• — Emission factor
lllil
• » 2.0
10.0
M
,.o B.
CO
n
o
3
»
O
4.0
4 5 6 7 8 9 10 20 30
Particle diameter, um
40 50 60 70 80 90 100
Aerodynamic
particle
diameter, um
2.5
6.0
10.0
Cumulative wt. % < stated size
Uncontrolled
26.0
30.6
38.0
Emission factor, kg/Mg
Uncontrolled
3.9
4.6
5.7
C.l-8
EMISSION FACTORS
10/86
-------
2.1 REFUSE INCINERATION: MUNICIPAL WASTE MASS BURN INCINERATOR
NUMBER OF TESTS: 7, conducted before control
STATISTICS: Aerodynamic Particle Diameter (urn):
Mean (Cum. %):
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
2.5
6.0
10.0
26.0 30.6 38.0
9.5 13.0 14.0
18 22 24
40 49 54
TOTAL PARTICULATE EMISSION FACTOR: 15 kg of particulate/Mg of refuse charged,
Emission factor from AP-42 Section 2.1.
SOURCE OPERATION: Municipal incinerators reflected in the data base include
various mass burning facilities of typical design and operation.
SAMPLING TECHNIQUE: Unknown.
EMISSION FACTOR RATING: D
REFERENCE:
Determination Of Uncontrolled Emissions, Product 2B, Montgomery County,
Maryland, Roy F. Weston, Inc., West Chester, PA, August 1984.
10/86
Appendix C.I
C.l-9
-------
2.1 REFUSE INCINERATION: MUNICIPAL WASTE MODULAR INCINERATOR
99.9
99
98
ZO
cd
rH
3
2
I
0.5
0.1
0.01
UNCONTROLLED
-•— Weight percent
Emission factor
10.0
w
B
H-
8.0 GO
cn
o
3
Hi
0)
O
rr
O
i-l
0?
4.0
2.0
4S67S910 20 30
Particle diameter, urn
40 SO 60 70 80 90 IOC
Aerodynamic
particle
diameter, urn
2.5
6.0
10.0
Cumulative wt. % < stated size
Uncontrolled
54.0
60.1
67.1
Emission factor, kg/Mg
Uncontrolled
8.1
9.0
10.1
C.l-10
EMISSION FACTORS
10/86
-------
2.1 REFUSE INCINERATION: MUNICIPAL WASTE MODULAR INCINERATOR
NUMBER OF TESTS: 3, conducted before control
STATISTICS: Aerodynamic Particle Diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 54.0 60.1 67.1
Standard deviation (Cum. %): 19.0 20.8 23.2
Min (Cum. %): 34.5 35.9 37.5
Max (Cum. %): 79.9 86.6 94.2
TOTAL PARTICULATE EMISSION FACTOR: 15 kg of particulate/Mg of refuse charged.
Emission factor from AP-42.
SOURCE OPERATION: Modular incinerator (2 chambered) operation was at 75.9% of
the design process rate (10,000 Ib/hr) and 101.2% of normal steam production
rate. Natural gas is required to start the incinerator each week. Average
waste charge tate was 1.983T/hr. Net heating value of garbage 4200-4800 BTU/lb
garbage charged.
SAMPLING TECHNIQUE: Andersen Impactor
EMISSION FACTOR RATING: C
REFERENCE:
Emission Test Report, City of Salem, Salem, Va, EMB-80-WFB-1, U. S. Envi-
ronmental Protection Agency, Research Triangle Park, NC, February 1980.
10/86 Appendix C.I C.l-11
-------
4.2.2.8 AUTOMOBILE & LIGHT DUTY TRUCK SURFACE COATING OPERATIONS:
AUTOMOBILE SPRAY BOOTHS (WATER BASE ENAMEL)
0)
N
09
•o
0)
4J
CO
JJ
w
V
&•"?
*
•H
§
(U
>
•H
4J
(0
iH
a
5
99.9
99
98
95
90
80
70
60
50
40
30
20
10
5
2
1
0.5
0.1
-
-
_
m
/
/
'
/ -
x/ ^^
B^**^ /
/
X
/
M*
«•
••
CONTROLLED
-*- Weight percent
Emission factor
• • i ,,.,,, , , ,,,,,,
3.0
M
^.
CO
0)
s-
3
2-° «.
ractor,
TO
~^.
TO
1.0
0.0
3 4 56789 10 20
Particle diameter, urn
30 40 50 60 70 80 90 IOC
Aerodynamic
particle
diameter, um
2.5
6.0
10.0
Cumulative wt. % < stated size
Water curtain controlled
28.6
38.2
46.7
Emission factor, kg/Mg
Water curtain controlled
1.39
1.85
2.26
C.l-12
EMISSION FACTORS
10/86
-------
4.2.2.8 AUTOMOBILE AND LIGHT DUTY TRUCK SURFACE COATING OPERATIONS:
AUTOMOBILE SPRAY BOOTHS (WATER BASE ENAMEL)
NUMBER OF TESTS: 2, conducted after water curtain control.
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 28.6 38.2 46.7
Standard deviation (Cum. %): 14.0 16.8 20.6
Min (Cum. %): 15.0 21.4 26.1
Max (Cum. %): 42.2 54.9 67.2
TOTAL PARTICULATE EMISSION FACTOR: 4.84 kg particulate/Mg of water base
enamel sprayed. From References a and b.
SOURCE OPERATION: Source is a water base enamel spray booth in an automotive
assembly plant. Enamel spray rate is 568 Ibs/hour, but spray gun type is not
identified. The spray booth exhaust rate is 95,000 scfm. Water flow rate to
the water curtain control device is 7181 gal/min. Source is operating at 84%
of design rate.
SAMPLING TECHNIQUE: SASS and Joy trains with cyclones.
EMISSION FACTOR RATING: D
REFERENCES:
a. H. J. Taback, Fine Particle Emissions from Stationary and Miscellaneous
Sources in the South Coast Air Basin, PB 293 923/AS, National Technical
Information Service, Springfield, VA, February 1979.
b. Emission test data from Environmental Assessment Data Systems, Fine Par-
ticle Emission Information System, Series Report No. 234, U. S. Environ-
mental Protection Agency, Research Triangle Park, NC, June 1983.
10/86 Appendix C.I C.l-13
-------
5.3 CARBON BLACK: OIL FURNACE PROCESS OFF GAS BOILER
99.9
99
98
N "
•H
CO
•o90
(U
4J
« 80
V
70
60
50
§30
£20
10
g
U
2
1
0.5
0.1
0.01
X
X
UNCONTROLLED
—•— Weight percent
Emission factor
1.75
1.50
w
B
H-
CO
01
o
3
a>
o
rt
o
•i
7?
OQ
I
1.25
* 5 6 7 8 9 10 20 30
Particle diameter, urn
I i i I I 1.00
40 SO 60 70 80 90 100
Aerodynamic
particle
diameter, um
2.5
6.0
10.0
Cumulative wt. % < stated size
Uncontrolled
87.3
95.0
97.0
Emission factor, kg/Mg
Uncontrolled
1.40
1.52
1.55
C.l-14
EMISSION FACTORS
10/86
-------
5.3 CARBON BLACK: OIL FURNACE PROCESS OFF GAS BOILER
NUMBER OF TESTS: 3, conducted at off gas boiler outlet
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 87.3 95.0 97.0
Standard Deviation (Cum. %): 2.3 3.7 8.0
Min (Cum. %): 76.0 90.0 94.5
Max (Cum. %): 94.0 99 100
TOTAL PARTICULATE EMISSION FACTOR: 1.6 kg particulate/Mg carbon black produced,
from reference.
SOURCE OPERATION: Process operation: "normal" (production rate = 1900 kg/hr).
Product is collected in fabric filter, but the off gas boiler outlet is
uncontrolled.
SAMPLING TECHNIQUE: Brinks Cascade Impactor
EMISSION FACTOR RATING: D
REFERENCE:
Air Pollution Emission Test, Phillips Petroleum Company, Toledo, OH, EMB-
73-CBK-l, U. S. Environmental Protection Agency, Research Triangle Park,
NC, September 1974.
10/86 Appendix C.I C.l-15
-------
5.17 SULFURIC ACID: ABSORBER (ACID ONLY)
0)
N
•a
cu
4J
CO
4-1
CO
V
4-1
A
99.99
99.9
99
98
90
80
70
60
50
01 30
s
10
1
0.5
0.1
0.01
UNCONTROLLED
>- Weight percent
.. Emission factor (0.2)
— Emission factor (2.0)
2.0
1.5
1.0
0.5
0.0
H
CO
CO
o
0
B>
n
rf
o
€
OQ
5 6 7 8 9 10
20
30 40 50 60 70 80 90 100
Particle diameter, um
Aerodynamic
particle
diameter, um
2.5
6.0
10.0
Cumulative wt . % < stated size
Uncontrolled
51.2
100
100
Emission factor, kg/Mg
Uncontrolled
(0.2) (2.0)
0.10
0.20
0.20
1.0
2.0
2.0
C.l-18
EMISSION FACTORS
10/86
-------
5.17 SULFURIC ACID: ABSORBER (ACID ONLY)
NUMBER OF TESTS: Not available
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 51.2 100 100
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: 0.2 to 2.0 kg acid mist/Mg sulfur charged,
for uncontrolled 98% acid plants burning elemental sulfur. Emission factors
are from AP-42.
SOURCE OPERATION: Not available
SAMPLING TECHNIQUE: Brink Cascade Impactor
EMISSION FACTOR RATING: E
REFERENCES:
a. Final Guideline Document: Control of Sulfuric Acid Mist Emissions from
Existing Sulfuric Acid Production Units, EPA-450/2-77-019, U. S. Environ-
mental Protection Agency, Research Triangle Park, NC, September 1977.
b. R. W. Kurek, Special Report On EPA Guidelines For State Emission Stand-
ards For Sulfuric Acid Plant Mist, E. I. du Pont de Nemours and Company,
Wilmington, DE, June 1974.
c. J. A. Brink, Jr., "Cascade Impactor For Adiabatic Measurements", Indus-
trial and Engineering Chemistry, 50:647, April 1958.
10/86 Appendix C.I C.l-19
-------
5.17 SULFURIC ACID: ABSORBER, 20% OLEUM
99.99
99.9
99
98
95
N
•H 90
CO
a)
jj
CO
v
.C
bO
CO
3
80
70
60
50
40
30
20
10
0.5
0.1
0.01
UNCONTROLLED
Weight percent
3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90 100
Particle diameter, urn
Aerodynamic
particle
diameter, um
2.5
6.0
10.0
Cumulative wt. % < stated size
Uncontrolled
97.5
100
100
Emission factor, kg/Mg
Uncontrolled
See Table 5.17-2
C.l-20
EMISSION FACTORS
10/86
-------
5.17 SULFURIC ACID: ABSORBER, 20% OLEUM
NUMBER OF TESTS: Not available
STATISTICS: Aerodynamic particle diameter (urn)*: 1.0 1.5 2.0
Mean (Cum. %): 26 50 73
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: Acid mist emissions from sulfuric acid
plants are a function of type of feed as well as oleum content of product.
See AP-42 Section 5.17, Table 5.17-2.
SOURCE OPERATION: Not available
SAMPLING TECHNIQUE: Brink Cascade Impactor
EMISSION FACTOR RATING: E
REFERENCES:
a. Final Guideline Document; Control of Sulfuric Acid Mist Emissions from
Existing Sulfuric Acid Production Units, EPA-450/2-77-019, U. S. Environ-
mental Protection Agency, Research Triangle Park, NC, September 1977.
b. R. W. Kurek, Special Report On EPA Guidelines For State Emission Stand-
ards For Sulfuric Acid Plant Mist, E. I. du Pont de Nemours and Company,
Wilmington, DE, June 1974.
c. J. A. Brink, Jr., "Cascade Impactor For Adiabatic Measurements", Indus-
trial and Engineering Chemistry, 50:647, April 1958.
'100% of the particulate is less than 2.5 urn in diameter.
10/86 Appendix C.I C.l-21
-------
5.17 SULFURIC ACID: ABSORBER, 32% OLEUM
99.99
99.9
99
98
95
0)
N
"«> 90
0)
4J
CO
u
(0
V
•u
bo
80
70
60
50
40
30
20
10
2
1
0.5
0.1
0.01
UNCONTROLLED
Weight percent
3 4 56789 10 20
Particle diameter, um
30 40 50 60 70 80 90 100
Aerodynamic
particle
diameter, um
2.5
6.0
10.0
Cumulative wt . % < stated size
Uncontrolled
100
100
100
Emission factor, kg/Mg
Uncontrolled
See Table 5.17-2
C.l-22
EMISSION FACTORS
10/86
-------
5.17 SULFURIC ACID: ABSORBER, 32% OLEUM
NUMBER OF TESTS: Not available
STATISTICS: Aerodynamic particle diameter (urn)*: 1.0 1.5 2.0
Mean (Cum. %): 41 63 84
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: Acid mist emissions from sulfuric acid
plants are a function of type of feed as well as oleum content of product. See
AP-42 Section 5.17, Table 5.17-2.
SOURCE OPERATION: Not available
SAMPLING TECHNIQUE: Brink Cascade Impactor
EMISSION FACTOR RATING: E
REFERENCES:
a. Final Guideline Document; Control of Sulfuric Acid Mist Emissions from
Existing Sulfuric Acid Production Units, EPA-450/2-77-019, U. S. Environ-
mental Protection Agency, Research Triangle Park, NC, September 1977.
b. R. W. Kurek, Special Report On EPA Guidelines For State Emission Stand-
ards For Sulfuric Acid Plant Mist, E. I. du Pont de Nemours and Company,
Wilmington, DE, June 1974.
c. J. A. Brink, Jr., "Cascade Impactor For Adiabatic Measurements", Indus-
trial and Engineering Chemistry, 50:647, April 1958.
100% of the particulate is less than 2.5 urn in diameter.
10/86 Appendix C.I C.l-23
-------
5.17 SULFURIC ACID: SECONDARY ABSORBER
99.99
99.9
99
98
V
N 95
•H
00
TJ 9°
V
u
2 8°
00
v 70
»< 60
50
40
Ml
T-l
a
3 30
0)
> 20
i 10
i
> 5
2
1
0.5
0.1
0.01
UNCONTROLLED
Weight percent
i
3 4 5 6 7 8 9 10 20
Particle diameter, um
30
40 50 60 70 80 90 100
Aerodynamic
particle
diameter , um
2.5
6.0
10.0
Cumulative wt. 7, <. stated size
Uncontrolled
48
78
87
Emission factor , kg/Mg
Uncontrolled
Not Available
Not Available
Not Available
C.l-24
EMISSION FACTORS-
10/86
-------
5.17 SULFURIC ACID: SECONDARY ABSORBER
NUMBER OF TESTS: Not available
STATISTICS: Particle Size (urn): 2.5 6.0 10.0
Mean (Cum. %): 48 78 87
Standard Deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: Acid mist emission factors vary widely
according to type of sulfur feedstock. See AP-42 Section 5.17 for guidance.
SOURCE OPERATION: Source is the second absorbing tower in a double absorption
sulfuric acid plant. Acid mist loading is 175 - 350 mg/m^.
SAMPLING TECHNIQUE: Andersen Impactor
EMISSION FACTOR RATING: E
REFERENCE:
G. E. Harris and L. A. Rohlack, "Particulate Emissions from Non-fired
Sources in Petroleum Refineries: A Review of Existing Data", Publica-
tion No. 4363, American Petroleum Institute, Washington, DC, December
1982.
10/86 Appendix C.I C.l-25
-------
5.xx CHEMICAL PROCESS INDUSTRY: BORIC ACID DRYER
99. »9
99.9
99
98
d) QS
N 95
•H
co
90
4J
«C 80
4->
CO
70
V
SsS 60
4J 50
j:
W> 40
*^
0)
!* 30
SJ 20
•H
l |
(0
H 10
3
a
3 .
u 5
2
1
0.5
0.1
0 01
UNCONTROLLED
—•— Weight percent
Emission factor
CONTROLLED
— •- Weight percent
-
^
^
*
~ —
;
'
/
"
/
1
' —
_
" / -sS^"^
^f^1^^
^-~^ff ^^
m^^^^^ J^^
/T
/ /
~ x^ / —
/ /
* /
^ '
1 1 Illllll 1 1 Illlll
0.5
0.4
W
1 ',
f— •
0)
CO
H-
O
3
HI
0.3 *
rt
O
i-t
"
7?
0?
0.2
0.1
0.0
1 2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90 IOC
Particle diameter, urn
Aerodynamic
particle
diameter, urn
2.5
6.0
10.0
Cumulative wt. % < stated size
Uncontrolled
0.3
3.3
6.9
Fabric filter
3.3
6.7
10.6
Emission factor, kg/Mg
Uncontrolled
0.01
0.14
0.29
Fabric filter
controlled
0.004
0.007
0.011
C.l-26
EMISSION FACTORS
10/86
-------
5.xx BORIC ACID DRYER
NUMBER OF TESTS: a) 1, conducted before controls
b) 1, conducted after fabric filter control
STATISTICS: (a) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 0.3 3.3 6.9
Standard Deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
(b) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 3.3 6.7 10.6
Standard Deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: Before control, 4.15 kg particulate/Mg
boric acid dried. After fabric filter control, 0.11 kg particulate/Mg boric
acid dried. Emission factors from Reference a.
SOURCE OPERATION: 100% of design process rate.
SAMPLING TECHNIQUE: a) Joy train with cyclones
b) SASS train with cyclones
EMISSION FACTOR RATING: E
REFERENCES:
a. H. J. Taback, Fine Particle Emissions from Stationary and Miscellaneous
Sources in the South Coast Air Basin, PB 293 923/AS, National Technical
Information Service, Springfield, VA, February 1979.
b. Emission test data from Environmental Assessment Data Systems, Fine Par-
ticle Emission Information System, Series Report No. 236, U. S. Environ-
mental Protection Agency, Research Triangle Park, NC, June 1983.
10/86 Appendix C.I C.l-27
-------
5.xx POTASH (POTASSIUM CHLORIDE) DRYER
99.99
99.9
99
98
95
•O
0) 80
V
bO
•H
—Weight percent
— Emission factor
CONTROLLED
k- Wt. % high pressure
5.0
4.0
3.0
I
09
CO
H-
O
3
O
i-l
0?
2.0
56789 10
20
0.0
30 40 50 60 70 80 90 100
Particle diameter, urn
Aerodynamic
particle
diameter (um)
2.5
6.0
10.0
Cumulative wt. % < stated size
Uncontrolled
0.95
2.46
4.07
High pressure
drop venturi
scrubber
5.0
7.5
9.0
Emission factor
(kg/Mg)
Uncontrolled
0.31
0.81
1.34
C.l-28
EMISSION FACTORS
10/86
-------
5.xx POTASH (POTASSIUM CHLORIDE) DRYER
NUMBER OF TESTS: a) 7, before control
b) 1, after cyclone and high pressure drop venturi scrubber
control
STATISTICS: a) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 0.95 2.46 4.07
Standard deviation (Cum. %): 0.68 2.37 4.34
Min (Cum. %): 0.22 0.65 1.20
Max (Cum. %): 2.20 7.50 13.50
b) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 5.0 7.5 9.0
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: Uncontrolled emissions of 33 kg particu-
late/Mg of potassium chloride product from dryer, from AP-42 Section 5.16. It
is assumed that particulate emissions from rotary gas fired dryers for potassium
chloride are similar to particulate emissions from rotary steam tube dryers for
sodium carbonate.
SOURCE OPERATION: Potassium chloride is dried in a rotary gas fired dryer.
SAMPLING TECHNIQUE: a) Andersen Impactor
b) Andersen Impactor
EMISSION FACTOR RATING: C
REFERENCES:
a) Emission Test Report, Kerr-Magee, Trona, CA, EMB-79-POT-4, U. S.
Environmental Protection Agency, Research Triangle Park, NC, April 1979.
b) Emission Test Report, Kerr-Magee, Trona, CA, EMB-79-POT-5, U. S.
Environmental Protection Agency, Research Triangle Park, NC April 1979.
10/86 Appendix C.I C.l-29
-------
5.xx POTASH (POTASSIUM SULFATE) DRYER
99.9
99
98
95
OU
N
•H 90
co
0) 80
TO
•U 70
CO
v 60
8s? 30
j- *0
•H* 30
»>
9 20
-------
5.xx POTASH (POTASSIUM SULFATE) DRYER
NUMBER OF TESTS: 2, conducted after fabric filter
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 18.0 32.0 43.0
Standard deviation (Cum. %): 7.5 11.5 14.0
Min (Cum. %): 10.5 21.0 29.0
Max (Cum. %): 24.5 44.0 14.0
TOTAL PARTICULATE EMISSION FACTOR: After fabric filter control, 0.033 kg
of particulate per Mg of potassium sulfate product from the dryer. Calculated
from an uncontrolled emission factor of 33 kg/Mg and control efficiency of
99.9 %. From Reference a and AP-42 Section 5.16. It is assumed that
particulate emissions from rotary gas fired dryers are similar to those from
rotary steam tube dryers.
SOURCE OPERATION: Potassium sulfate is dried in a rotary gas fired dryer.
SAMPLING TECHNIQUE: Andersen Impactor
EMISSION FACTOR RATING: E
REFERENCES:
a) Emission Test Report, Kerr-McGee, Trona, CA, EMB-79-POT-4, Office Of Air
Quality Planning And Standards, U. S. Environmental Protection Agency,
Research Triangle Park, NC, April 1979.
b) Emission Test Report, Kerr-McGee, Trona, CA, EMB-79-POT-5, Office Of Air
Quality Planning And Standards, U. S. Environmental Protection Agency,
Research Triangle Park, NC, April 1979.
10/86 Appendix C.I C.l-31
-------
6.1 ALFALFA DEHYDRATING: DRUM DRYER PRIMARY CYCLONE
99.9
99
98
0) 95
N
90
80
4J
CO
60
ij 50
J=
e
o
UNCONTROLLED
—•- Weight percent
Emission factor
0.3
cn
en
01
o
o
1-1
7?
V)
-0 ;0
"0 30
0.0
.DC
Particle diameter, urn
Aerodynamic
Particle
diameter, urn
2.5
6.0
10.0
Cum. wt. % < stated size
Uncontrolled
70.6
82.7
90.0
Emission factor, kg/Mg
Uncontrolled
3.5
4.1
4.5
C.l-32
EMISSION FACTORS
10/86
-------
6.1 ALFALFA DEHYDRATING: DRUM DRYER PRIMARY CYCLONE
NUMBER OF TESTS: 1, conducted before control
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 70.6 82.7 90.0
Standard deviation (Cum. %)
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: 5.0 kg particulate/Mg alfalfa pellets
before control. Factor from AP-42.
SOURCE OPERATION: During this test, source dried 10 tons of alfalfa/hour in a
direct fired rotary dryer.
SAMPLING TECHNIQUE: Nelson Cascade Impactor
EMISSION FACTOR RATING: E
REFERENCE:
Emission test data from Environmental Assessment Data Systems, Fine Par-
ticle Emission Information System, Series Report No. 152, U. S. Environ-
mental Protection Agency, Research Triangle Park, NC, June 1983.
10/86 Appendix C.I C.l-33
-------
6.3 COTTON GINNING: BATTERY CONDENSER
0)
N
•H
0)
•o
O
0.050 o
P-)
<•
_
TO
-•v.
o*
95
(D
f
0.006
0.003
0
100
Particle diameter, urn
Aerodynamic
particle
diameter (urn)
2.5
6.0
10.0
Cumulative wt. % < stated size
With
cyclone
8
33
62
With cyclone &
wet scrubber
11
26
52
Emission factor (kg/bale)
With
cyclone
0.007
0.028
0.053
With cyclone
& wet scrubber
0.001
0.003
0.006
C.l-34
EMISSION FACTORS
10/86
-------
6.3 COTTON GINNING: BATTERY CONDENSER
NUMBER OF TESTS: a) 2, after cyclone
b) 3, after wet scrubber
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
a) Mean (Cum. %): 8 33 62
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
b) Mean (Cum. %): 11 26 52
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICIPATE EMISSION FACTOR: Particulate emission factor for battery
condensers with typical controls is 0.09 kg (0.19 lb)/bale of cotton. From
AP-42. Factor with wet scrubber after cyclone is 0.012 kg (0.026 lb)/bale.
Scrubber efficiency is 86%. From Reference b.
SOURCE OPERATION: During tests, source was operating at 100% of design capa-
city. No other information on source is available.
SAMPLING TECHNIQUE: UW Mark 3 Impactor
EMISSION FACTOR RATING: E
REFERENCES:
a) Emission test data from Environmental Assessment Data Systems, Fine Par-
ticle Emission Information System (FPEIS), Series Report No. 27, U. S.
Environmental Protection Agency, Research Triangle Park, NC, June 1983.
b) Robert E. Lee, Jr., et al., "Concentration And Size Of Trace Metal Emis-
sions From A Power Plant, A Steel Plant, And A Cotton Gin", Environmental
Science And Technology, 9(7):643-7, July 1975.
10/86 Appendix C.I C.l-35
-------
6.3 COTTON GINNING: LINT CLEANER AIR EXHAUST
01
N
CO
01
09
V
01
01
(0
rH
3
99.99
99.9
99
98
95
90
80
70
60
50
40
30
20
10
2
1
0.5
0.1
0.01
5 6 7 8 9 10
CYCLONE
• Weight percent
Emission factor
CYCLONE AND WET SCRUBBER
—•—Weight percent
0.3
0.2
I
CO
CO
H-
o
3
o
rt
O
0"
PJ
0.1
20
30
40 50 60 70 80 90 IOC
Particle diameter, urn
Aerodynamic
particle
diameter (um)
2.5
6.0
10.0
Cumulative wt. % < stated size
After
cyclone
1
20
54
After cyclone
& wet scrubber
11
74
92
Emission factor
(kg /bale)
After cyclone
0.004
0.07
0.20
C.l-36
EMISSION FACTORS
10/86
-------
6.3 COTTON GINNING: LINT CLEANER AIR EXHAUST
NUMBER OF TESTS: a) 4, after cyclone
b) 4, after cyclone and wet scrubber
STATISTICS: a) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 1 20 54
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
b) Aerodynamic particle diameter (um): 2.5 6.0 10.0
Mean (Cum. %): 11 74 92
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: 0.37 kg particulate/bale of cotton
processed, with typical controls. Factor is from AP-42.
SOURCE OPERATION: Testing was conducted while processing both machine picked
and ground harvested upland cotton, at a production rate of about 6.8
bales/hr.
SAMPLING TECHNIQUE: Coulter counter.
EMISSION FACTOR RATING: E
REFERENCE:
S. E. Hughs, et al., "Collecting Particles From Gin Lint Cleaner Air
Exhausts", presented at the 1981 Winter Meeting of the American Society of
Agricultural Engineers, Chicago, IL, December 1981.
10/86 Appendix C.I C.l-37
-------
6.4 FEED AND GRAIN MILLS AND ELEVATORS:
CAROB KIBBLE ROASTER
'99.9
99
98
N
.j_f
w 90
•o
0)
J-" 80
U
w 70
^ 60
6-S
4J 5°
"§> 40
^_f
S 3°
0) 20
<0 10
3
U
2
1
0.5
0.1
0.01
-
"™
-
.
•
.
.
7
/
//-*
^xy
/
/
"""" UNCONTROLLED
— •— Weight percent
Emission factor
A 1 Illlill 1 A Illlll
0.75
0.50
0.25
0.0
M
s
H-
01
01
M.
O
3
O
rt
O
4 5 6 7 8 9 10 20
Particle diameter, urn
30 40 50 60 70 80 90 IOC
Aerodynamic
particle
diameter, urn
2.5
6.0
10.0
Cumulative wt . % < stated size
Uncontrolled
3.0
3.2
9.6
Emission factor, kg/Mg
Uncontrolled
0.11
0.12
0.36
I
C.l-44
EMISSION FACTORS
10/86
-------
6.4 FEED AND GRAIN MILLS AND ELEVATORS: CAROB KIBBLE ROASTER
NUMBER OF TESTS: 1, conducted before controls
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 3.0 3.2 9.6
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: 3.8 kg/Mg carob kibble roasted. Factor
from Reference a, pg. 4-175.
SOURCE OPERATION: Source roasts 300 kg carob pods per hour, 100% of the design
rate. Roaster heat input is 795 kj/hr of natural gas.
SAMPLING TECHNIQUE: Joy train with 3 cyclones.
EMISSION FACTOR RATING: E
REFERENCES:
a. H. J. Taback, Fine Particle Emissions from Stationary and Miscellaneous
Sources in the South Coast Air Basin, PB 293 923/AS, National Technical
Information Service, Springfield, VA, February 1979.
b. Emission test data from Environmental Assessment Data Systems, Fine Par-
ticle Emission Information System Series, Report No. 229, U. S. Environ-
mental Protection Agency, Research Triangle Park, NC, June 1983.
10/86 Appendix C.I C.l-45
-------
99.99
99.9
99
98
S 95
•H
CO
-0
90
4-1
O
rr
O
n
0.25
0.0
3 4 56789 10 20
Particle diameter, urn
30 40 50 60 70 80 90 100
Aerodynamic
particle
diameter, urn
2.5
6.0
10.0
Cumulative wt. % < stated size
Uncontrolled
27
37
44
Emission factor, kg/Mg
Uncontrolled
0.20
0.28
0.33
C.l-46
EMISSION FACTORS
10/86
-------
6.4 FEED AND GRAIN MILLS AND ELEVATORS: CEREAL DRYER
NUMBER OF TESTS: 6, conducted before controls
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 27 37 44
Standard deviation (Cum. %): 17 18 20
Min (Cum. %): 13 20 22
Max (Cum. %): 47 56 58
TOTAL PARTICULATE EMISSION FACTOR: 0.75 kg particulate/Mg cereal dried.
Factor taken from AP-42.
SOURCE OPERATION: Confidential.
SAMPLING TECHNIQUE: Andersen Mark III Impactor
EMISSION FACTOR RATING: C
REFERENCE:
Confidential test data from a major grain processor, PEI Associates,
Inc., Golden, CO, January 1985.
10/86 Appendix C.I C.l-47
-------
99.99
99.9
99
98
01 9!
N
•O
01
V
90
80
70
60
50
30
rH 10
6
5 5
2
1
0.5
0.01
6.4 FEED AND GRAIN MILLS AND ELEVATORS:
GRAIN UNLOADING IN COUNTRY ELEVATORS
y
UNCONTROLLED
—•— Weight percent
Emission factor
1.5
i.o
$
H-
CO
CO
H-
O
3
CO
O
It
O
0.5
0.0
4 5 6 7 8 9 10 20
Particle diameter, urn
30 40 50 60 70 80 90 IOC
Aerodynamic
particle
diameter, urn
2.5
6.0
10.0
Cumulative wgt. %
-------
6.4 FEED AND GRAIN MILLS AND ELEVATORS:
GRAIN UNLOADING IN COUNTRY ELEVATORS
NUMBER OF TESTS: 2, conducted before control
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 13.8 30.5 49.0
Standard deviation (Cum. %): 3.3 2.5
Min (Cum. %): 10.5 28.0 49.0
Max (Cum. %): 17.0 33.0 49.0
TOTAL PARTICULATE EMISSION FACTOR: 0.3 kg particulate/Mg of grain unloaded,
without control. Emission factor from AP-42.
SOURCE OPERATION: During testing, the facility was continuously receiving
wheat of low dockage. The elevator is equipped with a dust collection system
which serves the dump pit boot and leg.
SAMPLING TECHNIQUE: Nelson Cascade Impactor
EMISSION FACTOR RATING: D
REFERENCES:
a. Emission test data from Environmental Assessment Data Systems, Fine
Particle Emission Information System (FPEIS), Series Report No. 154, U. S.
Environmental Protection Agency, Research Triangle Park, NC, June 1983.
b. Emission Test Report, Uniontown Co-op, Elevator No. 2, Uniontown, WA,
Report No. 75-34, Washington State Department Of Ecology, Olympia, WA,
October 1975.
10/86 Appendix C.I C.l-49
-------
6.4 FEED AND GRAIN MILLS AND ELEVATORS: CONVEYING
0)
CO
CO
V
81
CJ
99.9
99
98
95
90
80
70
60
50
40
30
20
£ 10
2
1
0.5
0.1
0.01
UNCONTROLLED
>— Weight percent
-— Emission factor
0.3
rt
CO
CO
H-
O
o
i-h
CO
n
rt
o
H
0.1
o
4 5 6 7 8 9 10 20
Particle diameter, urn
30 40 50 60 70 80 90 100
Aerodynamic
particle
diameter, urn
2.5
6.0
10.0
Cumulative wt . % < stated size
Uncontrolled
16.8
41.3
69.4
Emission factor, kg/Mg
Uncontrolled
0.08
0.21
0.35
C.l-50
EMISSION FACTORS
10/86
-------
6.4 FEED AND GRAIN MILLS AND ELEVATORS: CONVEYING
NUMBER OF TESTS: 2, conducted before control
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 16.8 41.3 69.4
Standard deviation (Cum. %): 6.9 16.3 27.3
Min (Cum. %): 9.9 25.0 42.1
Max (Cum. %): 23.7 57.7 96.6
TOTAL PARTICIPATE EMISSION FACTOR: 0.5 kg particulate/Mg of grain processed,
without control. Emission factor from AP-42.
SOURCE OPERATION: Grain is unloaded from barges by "marine leg" buckets lifting
the grain from the barges and discharging it onto an enclosed belt conveyer,
which transfers the grain to the elevator. These tests measured the combined
emissions from the "marine leg" bucket unloader and the conveyer transfer
points. Emission rates averaged 1956 Ibs particulate/hour (0.67 kg/Mg grain
unloaded). Grains are corn and soy beans.
SAMPLING TECHNIQUE: Brinks Model B Cascade Impactor
EMISSION FACTOR RATING: D
REFERENCE:
Air Pollution Emission Test, Bunge Corporation, Destrehan, LA, EMB-74-
GRN-7, U. S. Environmental Protection Agency, Research Triangle Park,
NC, January 1974.
10/86 Appendix C.I C.l-51
-------
6.4 FEED AND GRAIN MILLS AND ELEVATORS: RICE DRYER
99.9
99
98
0) „.
N 95
,.,-J
fn
09
01
4J
« 80
u
CO
v 70
8^ 60
Jd 5°
W)
•H 40
> 30
> 20
•H
CO
•-j 10
3
2
CJ 5
2
1
0.5
0.1
0.01
/
1
1
1
t
" 1
1 ^
/'
/
t
1
1
- f
/
t
/ "**
/
t
1
9
1
1 -
1 /
t /
1 /
1 /
1 ^^
1 ^^^ ^
^^f
t
1
t
J
UNCONTROLLED
-•— Weight percent
Emission factor
2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90
0.015
W
H»
0)
CO
l_l.
o
l-tl
0.010 pi
n
rt
O
"•
?T
TO
"^
TO
0.005
0.00
100
Particle diameter, urn
Aerodynamic
Particle
diameter, urn
2.5
6.0
10.0
Cumulative wt. % < Stated Size
Uncontrolled
2.0
8.0
19.5
Emission Factor (kg/Mg)
Uncontrolled
0.003
0.01
0.029
C.l-52
EMISSION FACTORS
10/86
-------
6.4 FEED AND GRAIN MILLS AND ELEVATORS: RICE DRYER
NUMBER OF TESTS: 2, conducted on uncontrolled source.
STATISTICS: Aerodynamic Particle Diameter' (urn): 2.5 6.0 10.0
Mean (Cum. %): 2.0 8.0 19.5
Standard Deviation (Cum. %): - 3.3 9.4
Min (Cum. %): 2.0 3.1 10.1
Max (Cum. %): 2.0 9.7 28.9
TOTAL PARTICULATE EMISSION FACTOR: 0.15 kg particulate/Mg of rice dried.
Factor from AP-42, Table 6.4-1, footnote b for column dryer.
SOURCE OPERATION: Source operated at 100% of rated capacity, drying 90.8 Mg
rice/hr. The dryer is heated by four 9.5 kg/hr burners.
SAMPLING TECHNIQUE: Sass train with cyclones.
EMISSION FACTOR RATING: D
REFERENCES:
a. H. J. Taback, Fine Particle Emissions from Stationary and Miscellaneous
Sources in the South Coast Air Basin, PB 293 9237AS, National Technical
Information Service, Springfield, VA, February 1979.
b. Emission test data from Environmental Assessment Data Systems, Fine Par-
ticle Emission Information System, Series Report No. 228, U. S. Environ-
mental Protection Agency, Research Triangle Park, NC, June 1983.
10/86 Appendix C.I C.l-53
-------
6.18 AMMONIUM SULFATE FERTILIZER: ROTARY DRYER
99.99
99.9
99
98
-------
6.18 AMMONIUM SULFATE FERTILIZER: ROTARY DRYER
NUMBER OF TESTS: 3, conducted before control.
STATISTICS: Aerodynamic particle diameter (urn) 2.5 6.0 10.0
Mean (Cum. %): 10.8 49.1 98.6
Standard Deviation (Cum. %): 5.1 21.5 1.8
Min (Cum. %): 4.5 20.3 96.0
Max (Cum. %): 17.0 72.0 100.0
TOTAL PARTICULATE EMISSION FACTOR: 23 kg particulate/Mg of ammonium sulfate
produced. Factor from AP-42.
SOURCE OPERATION: Testing was conducted at three ammonium sulfate plants
operating rotary dryers within the following production parameters:
Plant A C D
% of design process rate 100.6 40.1 100
production rate, Mg/hr 16.4 6.09 8.4
SAMPLING TECHNIQUE: Andersen Cascade Impactors
EMISSION FACTOR RATING: C
REFERENCE:
Ammonium Sulfate Manufacture - Background Information For Proposed
Emission Standards, EPA-450/3-79-034a> U. S. Environmental Protection
Agency, Research Triangle Park, NC, December 1979.
10/86 Appendix C.I C.l-55
-------
7.1 PRIMARY ALUMINUM PRODUCTION: BAUXITE PROCESSING
FINE ORE STORAGE
99.99
99.9
99
98
-------
7.1 PRIMARY ALUMINUM PRODUCTION: BAUXITE PROCESSING
FINE ORE STORAGE
NUMBER OF TESTS: 2, after fabric filter control
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 50.0 62.0 68.0
Standard deviation (Cum. %): 15.0 19.0 20.0
Min (Cum. %): 35.0 43.0 48.0
Max (Cum. %): 65.0 81.0 88.0
TOTAL PARTICULATE EMISSION FACTOR: 0.0005 kg particulate/Mg of ore filled,
with fabric filter control. Factor calculated from emission and process data
in reference.
SOURCE OPERATION: The facility purifies bauxite to alumina. Bauxite ore,
unloaded from ships, is conveyed to storage bins from which it is fed to the
alumina refining process. These tests measured the emissions from the bauxite
ore storage bin filling operation (the ore drop from the conveyer into the bin),
after fabric filter control. Normal bin filling rate is between 425 and 475
tons per hour.
SAMPLING TECHNIQUE: Andersen Impactor
EMISSION FACTOR RATING: E
REFERENCE:
Emission Test Report, Reynolds Metals Company, Corpus Christi, TX, EMB-
80-MET-9, U. S. Environmental Protection Agency, Research Triangle Park,
NC, May 1980.
10/86 Appendix C.I C.l-57
-------
7.1 PRIMARY ALUMINUM PRODUCTION: BAUXITE PROCESSING
UNLOADING ORE FROM SHIP
99.99
99.9
99
98
01
N 95
•H
CO
-O 9°
0
•H
60
50
30
01
> 20
2
1
0.5
0.1
0.01
CONTROLLED
—•— Weight percent
Emission factor
0.0075
H-
CO
CO
H-
O
3
0.0050 »
£
0.0025
0.00
5 6 7 8 9 10 20 30 40 50 60 70 80 90 IOC.
Particle diameter, urn
Aerodynamic
particle
diameter, um
2.5
6.0
10.0
Cumulative wt . % < stated size
Wet
scrubber controlled
60.5
67.0
70.0
Emission factor, kg/Mg
Wet scrubber
controlled
0.0024
0.0027
0.0028
C.l-58
EMISSION FACTORS
10/86
-------
7.1 PRIMARY ALUMINUM PRODUCTION: BAUXITE PROCESSING
UNLOADING ORE FROM SHIP
NUMBER OF TESTS: 1, after venturi scrubber control
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 60.5 67.0 70.0
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: 0.004 kg particulate/Mg bauxite ore unloaded
after scrubber control. Factor calculated from emission and process data
contained in reference.
SOURCE OPERATION: The facility purifies bauxite to alumina. Ship unloading
facility normally operates at 1500-1700 tons/hr, using a self contained
extendable boom conveyor that interfaces with a dockside conveyor belt through
an accordion chute. The emissions originate at the point of transfer of the
bauxite ore from the ship's boom conveyer as the ore drops through the the
chute onto the dockside conveyer. Emissions are ducted to a dry cyclone and
then to a Venturi scrubber. Design pressure drop across scrubber is 15 inches,
and efficiency during test was 98.4 percent.
SAMPLING TECHNIQUE: Andersen Impactor
EMISSION FACTOR RATING: E
REFERENCE:
Emission Test Report, Reynolds Metals Company, Corpus Christi, TX, EMB-
80-MET-9, U. S. Environmental Protection Agency, Research Triangle Park,
NC, May 1980.
10/86 Appendix C.I C.l-59
-------
7.13 STEEL FOUNDRIES: CASTINGS SHAKEOUT
^9.99
99.9
99
98
g
90
T)
V
4_l
to 8°
JJ
CO
V
§
70
60
50
30
20
10
0.1
0.01
UNCONTROLLED
—•— Weight percent
Emission factor
15
M
S
H-
CD
CO
H-
O
10
O
rr
O
3 4 56789 10 20
Particle diameter, urn
30 40 50 60 70 80 90 100
Aerodynamic
particle
diameter, urn
2.5
6.0
10.0
Cumulative wt . % < stated size
Uncontroll ed
72.2
76.3
82.0
Emission factor, kg/Mg
Uncontroll ed
11.6
12.2
13.1
C.l-60
EMISSION FACTORS
10/86
-------
7.13 STEEL FOUNDRIES: CASTINGS SHAKEOUT
NUMBER OF TESTS: 2, conducted at castings shakeout exhaust hood before controls
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 72.2 76.3 82.0
Standard deviation (Cum. %): 5.4 6.9 4.3
Min (Cum. %): 66.7 69.5 77.7
Max (Cum. %): 77.6 83.1 86.3
TOTAL PARTICULATE EMISSION FACTOR: 16 kg particulate/Mg metal melted, without
controls. Although no nonfurnace emission factors are available for steel
foundries, emissions are presumed to be similar to those in iron foundries.
Nonfurnace emission factors for iron foundries are presented in AP-42.
SOURCE OPERATION: Source is a steel foundry casting steel pipe. Pipe molds
are broken up at the castings shakeout operation. No additional information is
available.
SAMPLING TECHNIQUE: Brinks Model BMS-11 Impactor
EMISSION FACTOR RATING: D
REFERENCE:
Emission test data from Environmental Assessment Data Systems, Fine
Particle Emission Information System, Series Report No. 117, U. S. Envi-
ronmental Protection Agency, Research Triangle Park, NC, June 1983.
10/86 Appendix C.I C.l-61
-------
7.13 STEEL FOUNDRIES: OPEN HEARTH EXHAUST
0)
N
0>
JJ
cd
4J
CO
V
99. S
99.9
99
98
95
90
80
70
60
50
M 30
20
01
g
(0
§
u
10
2
1
0.5
0.1
0.01
UNCONTROLLED
- Weight percent
- Emission factor
CONTROLLED
- Weight Percent
• Emission factor
- 8.0
7.0
6.0
5.0
g
i-h
O
4.0 rt
O
0X3
3.0
0.5
0.4
0.3
0.2
0.1
0.0
3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90 100
Particle diameter, urn
Aerodynamic
particle
diameter, um
2.5
6.0
10.0
Cumulative wt . % < stated size
Uncontrolled
79.6
82.8
85.4
ESP
49.3
58.6
66.8
Emission Factor (kg/Mg)
Uncontrolled
4.4
4.5
4.7
ESP
0.14
0.16
0.18
C.l-62
EMISSION FACTORS
10/86
-------
7.13 STEEL FOUNDRIES: OPEN HEARTH EXHAUST
NUMBER OF TESTS: a) 1, conducted before control
b) 1, conducted after ESP control
STATISTICS: a) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 79.6 82.8 85.4
Standard Deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
b) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 49.3 58.6 66.8
Standard Deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: 5.5 kg particulate/Mg metal processed,
before control. Emission factor from AP-42. AP-42 gives an ESP control
efficiency of 95 to 98.5%. At 95% efficiency, factor after ESP control is
0.275 kg particulate/Mg metal processed.
SOURCE OPERATION: Source produces steel castings by melting, alloying, and
casting pig iron and steel scrap. During these tests, source was operating at
100% of rated capacity of 8260 kg metal scrap feed/hour, fuel oil fired, and 8
hour heats.
SAMPLING TECHNIQUE: a) Joy train with 3 cyclones
b) Sass train with cyclones
EMISSION FACTOR RATING: E
REFERENCE:
Emission test data from Environmental Assessment Data Systems, Fine Par-
ticle Emission Information System, Series Report No. 233, U. S. Environ-
mental Protection Agency, Research Triangle Park, NC, June 1983.
10/86 Appendix C.I C.l-63
-------
7.15 STORAGE BATTERY PRODUCTION: GRID CASTING
11. It
99.9
99
98
95
0)
N
•* 90
00
"S 8°
JJ
(0
£J 70
CO
60
V
M 50
•£ 40
•H1 30
0)
3 20
0)
IJ 10
Q)
2 5
O
2
1
0.5
0.1
0. 01
/
/
/
/
/
/
» /
^
_
^ .^» <^B .^ —
^ ^
^s
_^x
- S
'
.
-
.
_
-
-
UNCONTROLLED
— •— Weight percent
Emission factor
2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90
2.0
1.5
1.0
0.5
0
100
01
CO
H)
Pi
It
O
cr
0>
09
Particle diameter, um
Aerodynamic
particle
diameter (um)
2.5
6.0
10.0
Cumulative wt. % < stated size
Uncontrolled
87.8
100
100
Emission factor
(kg/103 batteries)
Uncontrolled
1.25
1.42
1.42
C.l-64
EMISSION FACTORS
10/86
-------
7.15 STORAGE BATTERY PRODUCTION: GRID CASTING
NUMBER OF TESTS: 3, conducted before control
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 87.8 100 100
Standard deviation (Cum. %): 10.3
Min (Cum. %): 75.4 100 100
Max (Cum. %): 100 100 100
Impactor cut points were so small that most data points had to be
extrapolated.
TOTAL PARTICULATE EMISSION FACTOR: 1.42 kg particulate/103 batteries
produced, without controls. Factor from AP-42.
SOURCE OPERATION: During tests, plant was operated at 39% of design process
rate. Six of nine of the grid casting machines were operating during the test,
Typically, 26,500 to 30,000 pounds of lead per 24 hour day are charged to the
grid casting operation.
SAMPLING TECHNIQUE: Brinks Impactor
EMISSION FACTOR RATING: E
REFERENCE:
Air Pollution Emission Test, Globe Union, Inc., Canby, OR, EMB-76-BAT-4,
U. S. Environmental Protection Agency, Research Triangle Park, NC,
October 1976.
10/86 Appendix C.I C.l-65
-------
7.15 STORAGE BATTERY PRODUCTION: GRID CASTING AND PASTE MIXING
99.99
N
•H
00
•O
4J
03
V
.C
W)
•H
-------
7.15 STORAGE BATTERY PRODUCTION: GRID CASTING AND PASTE MIXING
NUMBER OF TESTS: 3, conducted before control
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 65.1 90.4 100
Standard deviation (Cum. %): 24.8 7.4
Min (Cum. %): 44.1 81.9 100
Max (Cum. %): 100 100 100
TOTAL PARTICULATE EMISSION FACTOR: 3.38 kg particulate/103 batteries,
without controls. Factor is from AP-42, and is the sum of the individual
factors for grid casting and paste mixing.
SOURCE OPERATION: During tests, plant was operated at 39% of the design
process rate. Grid casting operation consists of 4 machines. Each 2,000 Ib/hr
paste mixer is controlled for product recovery by a separate low energy impinge-
ment type wet collector designed for an 8 - 10 inch w. g. pressure drop at
2,000 acfm.
SAMPLING TECHNIQUE: Brinks Impactor
EMISSION FACTOR RATING:
REFERENCE:
Air Pollution Emission Test, Globe Union, Inc., Canby, OR, EKB-76-BAT-4,
U. S. Environmental Protection Agency, Research Triangle Park, NC,
October 1976.
10/86 Appendix C.I C.l-67
-------
7.15 STORAGE BATTERY PRODUCTION: LEAD OXIDE MILL
99.9
99
98
95
OJ
N
•H 90
CO
V 80
(0
W 70
CO
V 60
^ 50
4j 40
M
•H 30
* 20
>
•H
J-) 10
M
B 5
g
O
2
1
0.5
0.1
0.01
1
Aerodynamic
particle
diameter (ui
2.5
6.0
10.0
-
f
1
^ i
/
1
i P
I /
/ /
//
^*
" S*
;/ 1
/s .
,/ /
/
f
/
/
/
/
• i i i i i i i i
2 3 4 56789 10
Particle diamet«
Cumulative wt. % < stated size
n) After fabric filter
32.8
64.7
83.8
-
-
—
—
—
CONTROLLED
-•— Weight percent
— Emission factor
20 30 40 50 60 70 80 90
>r, urn
Emission factor
(kg/103 batteries)
After fabric filtei
0.016
0.032
0.042
0.05
9
0.0* »
H*
o
o
f-tl
0>
rt
O
1
0.03 "
;«r
«
o
Co
cr
o>
rf
0.02 n
i*
n>
CO
0.01
o
100
C.l-68
EMISSION FACTORS
10/86
-------
7.15 STORAGE BATTERY PRODUCTION: LEAD OXIDE MILL
NUMBER OF TESTS: 3, conducted after fabric filter
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 32.8 64.7 83.8
Standard deviation (Cum. %): 14.1 29.8 19.5
Min (Cum. %): 17.8 38.2 61.6
Max (Cum. %): 45.9 97.0 100
TOTAL PARTICULATE EMISSION FACTOR: 0.05 kg particulate/103 batteries, after
typical fabric filter control (oil to cloth ratio of 4:1). Emissions from a
well controlled facility (fabric filters with an average air to cloth ratio of
3:1) were 0.025 kg/103 batteries (Table 7.15-1 of AP-42).
SOURCE OPERATION: Plant receives metallic lead and manufactures lead oxide by
the ball mill process. There are 2 lead oxide production lines, each with a
typical feed rate of 15 one hundred pound lead pigs per hour. Product is
collected with a cyclone and baghouses with 4:1 air to cloth ratios.
SAMPLING TECHNIQUE: Andersen Impactor
EMISSION FACTOR RATING: E
REFERENCE:
Air Pollution Emission Test, ESB Canada Limited, Mississouga, Ontario,
EMB-76-BAT-3, U. S. Environmental Protection Agency, Research Triangle
Park, NC, August 1976.
10/86 Appendix C.I C.l-69
-------
7.15 STORAGE BATTERY PRODUCTION: PASTE MIXING & LEAD OXIDE CHARGING
99.99
99.9
N
i-l
00
73
0)
V
JJ
bC
•H
SI
§1
JJ 10
UNCONTROLLED
• • Weight percent
Emission factor
CONTROLLED
—•—Weight percent
0.01
3 4 56789 10 20
Particle diameter, urn
40 50 60 70 80 90 100
Aerodynamic
particle
diameter (um)
2.5
6.0
10.0
Cumulative wt. % < stated size
Uncontrolled
80
100
100
Fabric filter
47
87
99
Emission factor
(kg/103 batteries)
Uncontrolled
1.58
1.96
1.96
C.l-70
EMISSION FACTORS
10/86
-------
7.15 STORAGE BATTERY PRODUCTION: PASTE MIXING & LEAD OXIDE CHARGING
NUMBER OF TESTS: a) 1, conducted before control
b) 4, conducted after fabric filter control
STATISTICS: a) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 80 100 100
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
b) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 47 87 99
Standard deviation (Cum. %): 33.4 14.5 0.9
Min (Cum. %): 36 65 98
Max (Cum. %): 100 100 100
Impactor cut points were so small that many data points had to be extra-
polated. Reliability of particle size distributions based on a single test
is questionable.
TOTAL PARTICULATE EMISSION FACTOR: 1.96 kg particulate/103 batteries,
without controls. Factor from AP-42.
SOURCE OPERATION: During test, plant was operated at 39% of the design
process rate. Plant has normal production rate of 2,400 batteries per day and
maximum capacity of 4,000 batteries per day. Typical amount of lead oxide
charged to the mixer is 29,850 lb/8 hour shift. Plant produces wet batteries,
except formation is carried out at another plant.
SAMPLING TECHNIQUE: a) Brinks Impactor
b) Andersen
EMISSION FACTOR RATING:
REFERENCE:
Air Pollution Emission Test, Globe Union, Inc., Canby, OR, EMB-76-BAT-4,
U. S. Environmental Protection Agency, Research Triangle Park, NC,
October 1976.
10/86 Appendix C.I C.l-71
-------
7.15 STORAGE BATTERY PRODUCTION: THREE PROCESS OPERATION
99.99
99.9
99
98
95
01
N
T)
01 80
•M 70
\y 60
X 50
£ 40
bO
•H 30
* 20
ifl
3
10
2
1
0.5
0.1
0.01
UNCONTROLLED
—•—Weight percent
Emission factor
lkl
AS
40
35
w
w
CO
H-
O
9
l-h
Pi
O
ft
O
f(
Jf
CT-
0)
ft
(T
(D
(D
CO
3 4 56789 10 20
Particle diameter, urn
30
30 40 50 60 70 80 90 100
Aerodynamic
particle
diameter (um)
2.5
6.0
10.0
Cumulative wt. % < stated size
Uncontrolled
93.4
100
100
Emission factor
(kg/103 batteries)
Uncontrolled
39.3
42
42
C.l-72
EMISSION FACTORS
10/86
-------
7.15 STORAGE BATTERY PRODUCTION: THREE PROCESS OPERATION
NUMBER OF TESTS: 3, conducted before control
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 93.4 100 100
Standard deviation (Cum. %): 6.43
Min (Cum. %): 84.7
Max (Cum. %): 100
Impactor cut points were so small that data points had to be
extrapolated.
TOTAL PARTICULATE EMISSION FACTOR: 42 kg particulate/103 batteries, before
controls. Factor from AP-42.
SOURCE OPERATION: Plant representative stated that the plant usually operated
at 35% of design capacity. Typical production rate is 3,500 batteries per day
(dry and wet), but up to 4,500 batteries per day can be produced. This is
equivalent to normal and maximum daily element production of 21,000 and 27,000
battery elements, respectively.
SAMPLING TECHNIQUE: Brinks Impactor
EMISSION FACTOR RATING: E
REFERENCE:
Air Pollution Emission Test, ESB Canada Limited, Mississouga, Ontario,
EMB-76-BAT-3, U. S. Environmental Protection Agency, Research Triangle
Park, NC, August 1976.
10/86 Appendix C.I C.l-73
-------
7.xx BATCH TINNER
99.99
99.9
99
98
0>
N
•H
CO
•o
CD
90
CD 80
j_i
70
50
CU
I* 30
gl 20
•H
U
CO
.H 10
j.
2
1
0.5
0.1
0.01
UNCONTROLLED
—•— Weight percent
Emission factor
2.0
w
a
H.
CO
CO
H-
o
o
H>
V
o
rr
O
TO
1.0
0.0
3 4 56789 10 20
Particle diameter, um
30 40 50 60 70 80 90 IOC
Aerodynamic
particle
diameter, um
2.5
6.0
10.0
Cumulative wt. % < stated size
Uncontrolled
37.2
45.9
55.9
Emission factor, kg/Mg
Uncontrolled
0.93
1.15
1.40
C.l-74
EMISSION FACTORS
10/86
I
-------
7.xx BATCH TINNER
NUMBER OF TESTS: 2, conducted before controls
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 37.2 45.9 55.9
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: 2.5 kg particulate/Mg tin consumed, without
controls. Factor from AP-42, Section 7.14.
SOURCE OPERATION: Source is a batch operation applying a lead/tin coating to
tubing. No further source operating information is available.
SAMPLING TECHNIQUE: Andersen Mark III Impactor
EMISSION FACTOR RATING: D
REFERENCE:
Confidential test data, PEI Associates, Inc., Golden, CO, January 1985.
10/86 Appendix C.I C.l-75
-------
8.9 COAL CLEANING: DRY PROCESS
99.99
99.9
99
98
N 95
•H
CO
•a 90
0)
CO 80
CO
V
t>0
•H
01
i
70
60
50
30
10
5
2
1
0.5
0.1
0.01
CONTROLLED
—•— Weight percent
Emission factor
0.004
0.003
w
GO
CO
O
3
H)
O
O
i-l
0.002
TO
0.001
0.00
5 6 7 8 9 10 20
Particle diameter, urn
30
40 50 60 70 80 90 100
Aerodynamic
particle
diameter, urn
2.5
6.0
10.0
Cumulative wt. % < stated size
After fabric filter control
16
26
31
Emission factor, kg/Mg
After fabric filter control
0.002
0.0025
0.003
C.l-76
EMISSION FACTORS
10/86
-------
8.9 COAL CLEANING: DRY PROCESS
NUMBER OF TESTS: 1, conducted after fabric filter control
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 16 26 31
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: 0.01 kg particulate/Mg of coal processed.
Emission factor is calculated from data in AP-42, assuming 99% particulate
control by fabric filter.
SOURCE OPERATION: Source cleans coal with the dry (air table) process.
Average coal feed rate during testing was 70 tons/hr/table.
SAMPLING TECHNIQUE: Coulter counter
EMISSION FACTOR RATING: E
REFERENCE:
R. W. Kling, Emissions from the Florence Mining Company Coal Process-
ing Plant at Seward, PA, Report No. 72-CI-4, York Research Corporation,
Stamford, CT, February 1972.
10/86 Appendix C.I C.l-77
-------
SECTION 8.9 COAL CLEANING: THERMAL DRYER
N
CO
T3
01
cd
u
W
V
J3
0)
§
u
99.9
99
98
90
80
70
60
50
40
30
20
10
0.5
0.1
0.01
UNCONTROLLED
- Weight percent
- Emission factor
CONTROLLED
- Weight percent
5.0
w
3
H-
CO
CO
o
3
Hi
3.0 0)
o
£
1.0
0.0
5 6 7 8 9 10 20 30
Particle diameter, urn
40 50 60 70 80 90 100
Aerodynamic
particle
diameter, um
2.5
6.0
10.0
Cumulative wt . % < stated size
Uncontrolled
42
86
96
After
wet scrubber
53
85
91
Emission factor, kg/Mg
Uncontrolled
1.47
3.01
3.36
After
wet scrubber
0.016
0.026
0.027
C.l-78
EMISSION FACTORS
10/86
-------
SECTION 8.9 COAL CLEANING: 'THERMAL DRYER
NUMBER OF TESTS: a) 1, conducted before control
b) 1, conducted after wet scrubber control
STATISTICS: a) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 42 86 96
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
b) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 53 85 91
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: 3.5 kg particulate/Mg of coal processed,
(after cyclone) before wet scrubber control. After wet scrubber control, 0.03
kg/Mg. These are site specific emission factors and are calculated from process
data measured during source testing.
SOURCE OPERATION: Source operates a thermal dryer to dry coal cleaned by wet
cleaning process. Combustion zone in the thermal dryer is about 1000°F, and
the air temperature at the dryer exit is about 125°F. Coal processing rate is
about 450 tons per hour. Product is collected in cyclones.
SAMPLING TECHNIQUE: a) Coulter counter
b) Each sample was dispersed with aerosol OT, and further
dispersed using an ultrasonic bath. Isoton was the
electrolyte used.
EMISSION FACTOR RATING: E
REFERENCE:
R. W. Kling, Emission Test Report, Island Creek Coal Company Coal Pro-
cessing Plant, Vansant, Virgina, Report No. Y-7730-H, York Research
Corporation, Stamford, CT, February 1972.
10/86 Appendix C.I C.l-79
-------
8.9 COAL PROCESSING: THERMAL INCINERATOR
rt.99
99.9
99
98
N 95
•H
CO
^ 90
0)
4J
5 80
CO
V
70
60
bC
40
•* 30
SI 20
•H 10
0 5
2
1
0.5
0.1
0.01
UNCONTROLLED
—•— Weight percent
Emission factor
CONTROLLED
• Weight percent
0.4
CO
CO
H-
O
CJ
l-h
CB
O
rt
O
H
0
0.2
4 5 6 7 8 9 10 20 30
Particle diameter, urn
o.o
40 50 60 70 80 90 100
Aerodynamic
particle
diameter, urn
2.5
6.0
10.0
Cumulative wt . % < stated size
Uncontrolled
9.6
17.5
26.5
Cyclone
controlled
21.3
31.8
43.7
Emission factor, kg/Mg
Uncontrolled
0.07
0.12
0.19
C.l-80
EMISSION FACTORS
10/86
-------
8.9 COAL PROCESSING: THERMAL INCINERATOR
NUMBER OF TESTS: a) 2, conducted before controls
b) 2, conducted after multicyclone control
STATISTICS: a) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 9.6 17.5 26.5
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. % ):
b) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 26.4 35.8 46.6
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: 0.7 kg particulate/Mg coal dried, before
multiclone control. Factor from AP-42.
SOURCE OPERATION: Source is a thermal incinerator controlling gaseous emissions
from a rotary kiln drying coal. No additional operating data are available.
SAMPLING TECHNIQUE: Andersen Mark III Impactor
EMISSION FACTOR RATING: D
REFERENCE:
Confidential test data from a major coal processor, PEI Associates, Inc.,
Golden, CO, January 1985.
10/86 Appendix C.I C.l-81
-------
8.18 PHOSPHATE ROCK PROCESSING: CALCINER
cu
N
•O
0.050 0>
O
ft
O
n
ff
0.025
3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90 100
Particle diameter, urn
Aerodynamic
particle
diameter, urn
2.5
6.0
10.0
Cumulative wt. % < stated size
After cyclone3 and
wet scrubber
94.0
97.0
98.0
Emission factor, kg/Mg
After cyclone3 and
wet scrubber
0.064
0.066
0.067
3Cyclones are typically used in phosphate rock processing as product collectors.
Uncontrolled emissions are emissions in the air exhausted from such cyclones.
C.l-82
EMISSION FACTORS
10/86
-------
8.18 PHOSPHATE ROCK PROCESSING: CALCINER
NUMBER OF TESTS: 6, conducted after wet scrubber control
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 94.0 97.0 98.0
Standard deviation (Cum. %): 2.5 1.6 1.5
Min (Cum. %): 89.0 95.0 96.0
Max (Cum. %): 98.0 99.2 99.7
TOTAL PARTICULATE EMISSION FACTOR: 0.0685 kg particulate/Mg of phosphate
rock calcined, after collection of airborne product in a cyclone, and wet
scrubber controls. Factor from reference cited below.
SOURCE OPERATION: Source is a phosphate rock calciner fired with #2 oil,
with a rated capacity of 70 tons/hour. Feed to the calciner Is beneficiated
rock.
SAMPLING TECHNIQUE: Andersen Impactor.
EMISSION FACTOR RATING: C
REFERENCE: Air Pollution Emission Test, Beker Industries, Inc., Conda, ID,
EMB-75-PRP-4, U. S. Environmental Protection Agency, Research Triangle Park,
NC, November 1975.
10/86 Appendix C.I C.l-83
-------
8.18 PHOSPHATE ROCK PROCESSING: OIL FIRED ROTARY AND
FLUIDIZED BED TANDEM DRYERS
99.9
99
98
95
<0
N
i-t 90
00
01 80
JJ
CD
i-> 70
CO
v 6°
*« 50
4J 40
bC
•H 30
•H
JJ 10
(0
3 ,
B 5
O
2
I
0.5
0.1
0. 01
1
-
-
"
^^^*
^^^"^
m m^^
^S^
^^^^^ ^ '
^^^^^ s
W*^ s
^
^
^ -*
""^ —m
-
WET SCRUBBER AND ESP
— •— Weight percent
Emission factor
2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90
0.015
M
0
H*
co
CO
o
0
l-t(
0.010 0)
O
o
,r
^
0?
.005
o
100
Particle diameter, um
Aerodynamic
particle
diameter, um
2.5
6.0
10.0
Cumulative wt. % < stated size
After wet scrubber and
ESP control
78.0
88.8
93.8
Emission factor, kg/Mg
After wet scrubber and
ESP control
0.010
0.011
0.012
I
C.l-84
EMISSION FACTORS
10/86
-------
8.18 PHOSPHATE ROCK PROCESSING:
OIL FIRED ROTARY AND FLUIDIZED BED TANDEM DRYERS
NUMBER OF TESTS: 2, conducted after wet scrubber and electrostatic pre-
clpitator control
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 78.0 88.8 93.8
Standard deviation (Cum. %): 22.6 9.6 2.5
Min (Cum. %): 62 82 92
Max (Cum. %): 94 95 95
TOTAL PARTICULATE EMISSION FACTOR: 0.0125 kg particulate/Mg phosphate rock
processed, after collection of airborne product in a cyclone and wet scrubber/
ESP controls. Factor from reference cited below.
SOURCE OPERATION: Source operates a rotary and a fluidized bed dryer to dry
various types of phosphate rock. Both dryers are fired with No. 5 fuel oilv
and exhaust into a common duct. The rated capacity of the rotary dryer is
300 tons/hr, and that of the fluidized bed dryer is 150-200 tons/hr. During
testing, source was operating at 67.7% of rated capacity.
SAMPLING TECHNIQUE: Andersen Impactor
EMISSION FACTOR RATING: C
REFERENCE: Air Pollution Emission Test, W. R. Grace Chemical Company, Bartow,
FL, EMB-75-PRP-1, U. S. Environmental Protection Agency, Research Triangle
Park, NC, January 1976.
10/86 Appendix C.I C.l-85
-------
8.18 PHOSPHATE ROCK PROCESSING: OIL FIRED ROTARY DRYER
N
•H
CO
T3
0)
u
n)
4J
CO
V
be
•H
-------
8.18 PHOSPHATE ROCK PROCESSING: OIL FIRED ROTARY DRYER
NUMBER OF TESTS: a) 3, conducted after cyclone
b) 2, conducted after wet scrubber control
STATISTICS: a) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 15.7 41.3 58.3
Standard deviation (Cum. %): 5.5 9.6 13.9
Min (Cum. %): 12 30 43
Max (Cum. %): 22 48 70
b) Aerodynamic particle diametet (urn): 2.5 6.0 10.0
Mean (Cum. %): 89.0 92.3 96.6
Standard Deviation (Cum. %): 7.1 6.0 3.7
Min (Cum. %): 84 88 94
Max (Cum. %): 94 96 99
Impactor cut points for the tests conducted before control are small, and
many of the data points are extrapolated. These particle size distributions
are related to specific equipment and source operation, and are most appli-
cable to particulate emissions from similar sources operating similar equip-
ment. Table 8.18-2, Section 8.18, AP-42 presents particle size distributions
for generic phosphate rock dryers.
TOTAL PARTICULATE EMISSION FACTORS: After cyclone, 2.419 kg particulate/Mg
rock processed. After wet scrubber control, 0.019 kg/Mg. Factors from
reference cited below.
SOURCE OPERATION: Source dries phosphate rock in #6 oil fired rotary dryer.
During these tests, source operated at 69% of rated dryer capacity of 350 ton/
day, and processed coarse pebble rock.
SAMPLING TECHNIQUE: a) Brinks Cascade Impactor
b) Andersen Impactor
EMISSION FACTOR RATING: D
REFERENCE: Air Pollution Emission Test, Mobil Chemical, Nichols, FL, EMB-75-
PRP-3, U. S. Environmental Protection Agency, Research Triangle Park, NC,
January 1976.
10/86 Appendix C.I C.l-87
-------
8.18 PHOSPHATE ROCK PROCESSING: BALL MILL
CU
N
•H
CO
CO
CO
V
fr*
§
CU
CU
•H
J_l
CO
3
99.9
99.9
99
98
95
90
80
70
60
50
40
30
20
0.1
0.01
CYCLONE
• • Weight percent
Emission factor
0.4
w
co
CO
l-h
P)
O
ft
O
i-l
ff
0.2
4 5 6 7 8 9 10 20
Particle diameter, um
30 40 50 60 70 80 90 100
Aerodynamic
particle
diameter, um
2.5
6.0
10.0
Cumulative wt. % < stated size
After cyclone3
6.5
19.0
30.8
Emission factor, kg/Mg
After cyclone3
0.05
0.14
0.22
3Cyclones are typically used in phosphate rock processing as product collectors.
Uncontrolled emissions are emissions in the air exhausted from such cyclones.
i — £
• -L C
EMISSION FACTORS
10/86
-------
8.18 PHOSPHATE ROCK PROCESSING: BALL MILL
NUMBER OF TESTS: 4, conducted after cyclone
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 6.5 19.0 30.8
Standard deviation (Cum. %): 3.5 0.9 2.6
Min (Cum. %): 3 18 28
Max (Cum. %): 11 20 33
Impactor outpoints were small, and most data points were extrapolated.
TOTAL PARTICULATE EMISSION FACTOR: 0.73 kg particulate/Mg of phosphate rock
milled, after collection of airborne product in cyclone. Factor from
reference cited below.
SOURCE OPERATION: Source mills western phosphate rock. During testing^
source was operating at 101% of rated capacity, producing 80 tons/hour.
SAMPLING TECHNIQUE: Brinks Impactor
EMISSION FACTOR RATING: C
REFERENCE: Air Pollution Emission Test, Beker Industries, Inc., Conda, ID,
EMB-75-PRP-4, U. S. Environmental Protection Agency, Research Triangle
Park, NC, November 1975.
10/86 Appendix C.I C.l-89
-------
8.18 PHOSPHATE ROCK PROCESSING: ROLLER MILL AND BOWL MILL GRINDING
99.99
V
N
•H
«0
CO
V
99.9
99
98
95
90
80
70
60
50
40
$ 30
V
01
•H
4J
«t
— I
I
o
20
10
5
2
1
0.5
0.1
0.01
CYCLONE
>— Weight percent
--Emission factor
CYCLONE AND FABRIC FILTER
I—Weight percent
1.5
1.0
I
CD
01
H-
o
o
n
rt
o
0.5
3 * 5 6 7 8 9 10 20 30 40 50 60 70 80 90 100
Particle diameter, um
Aerodynamic
particle
diameter, um
2.5
6.0
10.0
Cumulative wt. % < stated size
After
cyclone3
21
45
62
After fabric filter
25
70
90
Emission factor, kg/Mg
After
cyclone3
0.27
0.58
0.79
After fabric filter
Negligible
Negligible
Negligible
a Cyclones are typically used in phosphate rock processing as product collectors.
Uncontrolled emissions are emissions in the air exhausted from such cyclones.
C.l-90
EMISSION FACTORS
10/86
-------
8.18 PHOSPHATE ROCK PROCESSING: ROLLER MILL AND BOWL MILL GRINDING
NUMBER OF TESTS: a) 2, conducted after cyclone
b) 1, conducted after fabric filter control
STATISTICS: a) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 21.0 45.0 62.0
Standard deviation (Cum. %): 1.0 1.0 0
Min (Cum. %): 20.0 44.0 62.0
Max (Cum. %): 22.0 46.0 62.0
b) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 25 70 90
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: 0.73 kg particulate/Mg of rock pro-
cessed, after collection of airborne product in a cyclone. After fabric
filter control, 0.001 kg particulate/Mg rock processed. Factors calculated
from data in reference cited below. AP-42 (2/80) specifies a range of
emissions from phosphate rock grinders (uncontrolled). See Table 8.18-1
for guidance.
SOURCE OPERATION: During testing, source was operating at 100% of design
process rate. Source operates 1 roller mill with a rated capacity of 25
tons/hr of feed, and 1 bowl mill with a rated capacity of 50 tons/hr of
feed. After product has been collected in cyclones, emissions from each
mill are vented to a common baghouse. Source operates 6 days/week, and
processes Florida rock.
SAMPLING TECHNIQUE: a) Brinks Cascade Impactor
b) Andersen Impactor
EMISSION FACTOR RATING: D
REFERENCE: Air Pollution Emission Test, The Royster Company, Mulberry,
FL, EMB-75-PRP-2, U. S. Environmental Protection Agency, Research Triangle
Park, NC, January 1976.
10/86 Appendix C.I C.l-91
-------
8.xx NONMETALLIC MINERALS: FELDSPAR BALL MILL
99.99
99.9
99
98
0) 95
N
•H
•O
0)
4-1
n>
4-1
CO
V
90
80
70
60
jj 50
fi
00 40
•H
•J 30
-------
8.xx NONMETALLIC MINERALS: FELDSPAR BALL MILL
NUMBER OF TESTS: 2, conducted before controls
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 11.5 22.8 32.3
Standard deviation (Cum. %): 6.4 7.4 6.7
Min (Cum. %): 7.0 17.5 27.5
Max (Cum. %): 16.0 28.0 37.0
TOTAL PARTICULATE EMISSION FACTOR: 12.9 kg particulate/Mg feldspar produced.
Calculated from data in reference and related documents.
SOURCE OPERATION: After crushing and grinding of feldspar ore, source produces
feldspar powder in a ball mill.
SAMPLING TECHNIQUE: Alundum thimble followed by 12 inch section of stainless
steel probe followed by 47 mm type SGA filter contained in a stainless steel
Gelman filter holder. Laboratory analysis methods: microsieve and electronic
particle counter.
EMISSION FACTOR RATING: D
REFERENCE:
Air Pollution Emission Test, International Minerals and Chemical Company,
Spruce Pine, NC, EMB-76-NMM-1, U. S. Environmental Protection Agency,
Research Triangle Park, NC, September 1976.
10/86 Appendix C.I C.l-93
-------
8.xx NONMETALLIC MINERALS: FLUORSPAR ORE ROTARY DRUM DRYER
99.99
99.9
99
98
OJ 95
N
00
-O
40
•J 30
5> 20
cd
o
10
i
0.5
0.1
0.01
CONTROLLED
Weight percent
Emission factor
0.4
w
B
H-
cn
09
M.
O
B
l-h
to
r>
rt
O
"I
0.2
4 5 6 7 8 9 10 20 30
Particle diameter, um
0.0
40 50 60 70 80 90 100
Aerodynamic
particle
diameter, um
2.5
6.0
10.0
Cumulative wt. % < stated size
After fabric filter control
10
30
48
Emission factor, kg/Mg
After fabric filter control
0.04
0.11
0.18
C.l-94
EMISSION FACTORS
10/86
-------
8.xx NONMETALLIC MINERALS: FLUORSPAR ORE ROTARY DRUM DRYER
NUMBER OF TESTS: 1, conducted after fabric filter control
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 10 30 48
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: 0.375 kg particulate/Mg ore dried, after
fabric filter control. Factors from reference.
SOURCE OPERATION: Source dries fluorspar ore in a rotary drum dryer at a feed
rate of 2 tons/hour.
SAMPLING TECHNIQUE: Andersen Mark III Impactor
EMISSION FACTOR RATING: E
REFERENCE:
Confidential test data from a major fluorspar ore processor, PEI
Associates, Inc., Golden, CO, January 1985.
10/86 Appendix C.I C.l-95
-------
8.xx LIGHTWEIGHT AGGREGATE (CLAY): COAL FIRED ROTARY KILN
99.99
99.9
99
98
95
90
80
70
B^S 6°
jj 50
H1? 40
•rH
U 30
y 20
CO
T3
01
JJ
(fl
XJ
CO
V
cfl
1.0
I '
1
0.5
0.1
0.01
WET SCRUBBER and
SETTLING CHAMBER
•— Weight percent
Emission factor
WET SCRUBBER
•— Weight percent
2.0
m
en
m
Mi
0>
r>
ff
1.0
3 4 56789 10 20
Particle diameter, urn
30
0.0
40 50 60 70 80 90 100
Aerodynamic
particle
diameter (um)
2.5
6.0
10.0
Cumulative wt. % < stated size
Wet scrubber
and settling chamber
55
65
81
Wet
scrubber
55
75
84
Emission factor (kg/Mg)
Wet scrubber
and settling chamber
0.97
1.15
1.43
C.l-96
EMISSION FACTORS
10/86
-------
8.xx LIGHTWEIGHT AGGREGATE (CLAY): COAL FIRED ROTARY KILN
NUMBER OF TESTS: a) 4, conducted after wet scrubber control
b) 8, conducted after settling chamber and wet scrubber
control
STATISTICS: a) Aerodynamic particle diameter, (urn): 2.5 6.0 10.0
Mean (Cum. %): 55 75 84
Standard Deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
b) Aerodynamic particle diameter, (urn): 2.5 6.0 10.0
Mean (Cum. %): 55 65 81
Standard Deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: 1.77 kg particulate/Mg of clay processed,
after control by settling chamber and wet scrubber. Calculated from data in
Reference c.
SOURCE OPERATION: Sources produce lightweight clay aggregate in pulverized
coal fired rotary kilns. Kiln capacity for Source b is 750 tons/day, and
operation is continuous.
SAMPLING TECHNIQUE: Andersen Impactor
EMISSION FACTOR RATING: C
REFERENCES:
a. Emission Test Report, Lightweight Aggregate Industry, Texas Industries,
Inc., EMB-80-LWA-3, U. S. Environmental Protection Agency, Research
Triangle Park, NC, May 1981.
b. Emission test data from Environmental Assessment Data Systems, Fine Par-
ticle Emission Information System, Series Report No. 341, U. S. Environ-
mental Protection Agency, Research Triangle Park, NC, June 1983.
c. Emission Test Report, Lightweight Aggregate Industry, Arkansas Light-
weight Aggregate Corporation, EMB-80-LWA-2, U. S. Environmental
Protection Agency, Research Triangle Park, NC, May 1981.
10/86 Appendix C.I C.l-97
-------
8.xx LIGHTWEIGHT AGGREGATE (CLAY): DRYER
99.f
99.9
99
98
0) 95
N
•H
w 90
80
70
V
60
AJ 5°
"S) *0
•H
S 30
0) 20
i-t
4J
CO 10
CJ
2
1
0.5
0.1
0.01
UNCONTROLLED
—•— Weight percent
Emission factor
40
w
0
CO
CO
H-
O
s
i-h
09
O
O
i-i
OQ
20
3 4 56789 10 20 30
Particle diameter, urn
AO 50 60 70 80 90 IOC
Aerodynamic
particle
diameter, um
2.5
6.0
10.0
Cumulative wt . % < stated size
Uncontrolled
37.2
74.8
89.5
Emission factor, kg/Mg
Uncontrolled
13.0
26.2
31.3
C.l-98
EMISSION FACTORS
10/86
-------
8.xx LIGHTWEIGHT AGGREGATE (CLAY): DRYER
NUMBER OF TESTS: 5, conducted before controls
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 37.2 74.8 89.5
Standard deviation (Cum. %): 3.4 5.6 3.6
Min (Cum. %): 32.3 68.9 85.5
Max (Cum. %): 41.0 80.8 92.7
TOTAL PARTICULATE EMISSION FACTOR: 35 kg/Mg clay feed to dryer. From
AP-42, Section 8.7.
SOURCE OPERATION: No information on source operation is available
SAMPLING TECHNIQUE: Brinks impactor
EMISSION FACTOR RATING: C
REFERENCE:
Emission test data from Environmental Assessment Data Systems, Fine Par-
ticle Emission Information System, Series Report No. 88, U. S. Environ-
mental Protection Agency, Research Triangle Park, NC, June 1983.
10/86 Appendix C-l C.l-99
-------
8.xx LIGHTWEIGHT AGGREGATE (CLAY): RECIPROCATING GRATE CLINKER COOLER
99.9
99
98
N 95
CO
0)
j_i
(0 80
4J
05
V
70
g^ 60
•U 50
S *0
0)
IS 30
y 20
m
10
a
U 5
7
1
0.5
0. 1
0.01
MULTICLONE CONTROLLED
—•— Weight percent
Emission factor
FABRIC FILTER
—•— Weight percent
0.15
a
CO
en
O
3
l-h
0.10 (U
rr
O
i-l
(JQ
0.05
0.0
3 4 56789 10 20
Particle diameter, urn
30 40 50 60 70 80 90 100
Aerodynamic
particle
diameter, um
2.5
6.0
10.0
Cumulative wt . % < stated size
Multi clone
19.3
38.1
56.7
Fabric filter
39
48
54
Emission factor, kg/Mg
Multi clone
0.03
0.06
0.09
C.1-100
EMISSION FACTORS
10/86
-------
8.xx LIGHTWEIGHT AGGREGATE (CLAY): RECIPROCATING GRATE CLINKER COOLER
NUMBER OF TESTS: a) 12, conducted after Multiclone control
b) 4, conducted after Multiclone and fabric filter control
STATISTICS: a) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 19.3 38.1 56.7
Standard deviation (Cum. %): 7.9 14.9 17.9
Min (Cum. %): 9.3 18.6 29.2
Max (Cum. %): 34.6 61.4 76.6
b) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 39 48 54
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %) :
TOTAL PARTICULATE EMISSION FACTOR: 0.157 kg particulate/Mg clay processed,
after multiclone control. Factor calculated from data in Reference b. After
fabric filter control, particulate emissions are negligible.
SOURCE OPERATION: Sources produce lightweight clay aggregate in a coal fired
rotary kiln and reciprocating grate clinker cooler.
SAMPLING TECHNIQUE: a) Andersen Impactor
b) Andersen Impactor
EMISSION FACTOR RATING: C
REFERENCES:
a. Emission Test Report, Lightweight Aggregate Industry, Texas Industries,
Inc., EMB-80-LWA-3, U. S. Environmental Protection Agency, Research
Triangle Park, NC, May 1981.
b. Emission Test Report, Lightweight Aggregate Industry, Arkansas Light-
weight Aggregate Corporation, EMB-80-LWA-2, U. S. Environmental
Protection Agency, Research Triangle Park, NC, May 1981.
c. Emission test data from Environmental Assessment Data Systems, Fine
Particle Emission Information System, Series Report No. 342, U. S.
Environmental Protection Agency, Research Triangle Park, NC, June 1983.
10/86 Appendix C.I C.1-101
-------
8.xx LIGHTWEIGHT AGGREGATE (SHALE): RECIPROCATING GRATE CLINKER COOLER
99.99
99.9
99
98
CU
N
0)
4J
CO 80
4J
CO
70
V
4-1 JO
§40
-------
8.xx LIGHTWEIGHT AGGREGATE (SHALE): RECIPROCATING GRATE CLINKER COOLER
NUMBER OF TESTS: 4, conducted after settling chamber control
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 8.2 17.6 25.6
Standard deviation (Cum. %): 4.3 2.8 1.7
Min (Cum. %): 4.0 15.0 24.0
Max (Cum. %): 14.0 21.0 28.0
TOTAL PARTICULATE EMISSION FACTOR: 0.08 kg particulate/Mg of aggregate
produced. Factor calculated from data in reference.
SOURCE OPERATION: Source operates two kilns to produce lightweight shale
aggregate, which is cooled and classified on a reciprocating grate clinker
cooler. Normal production rate of the tested kiln is 23 tons/hr, about 66% of
rated capacity. Kiln rotates at 2.8 rpm. Feed end temperature is 1100°F.
SAMPLING TECHNIQUE: Andersen Impactor
EMISSION FACTOR RATING: B
REFERENCE:
Emission Test Report, Lightweight Aggregate Industry, Vulcan Materials
Company, EMB-80-LWA-4, U. S. Environmental Protection Agency, Research
Triangle Park, NC, March 1982.
10/86 Appendix C.I C.1-103
-------
8.xx LIGHTWEIGHT AGGREGATE (SLATE): COAL FIRED ROTARY KILN
99.99
99.9
99
98
0) a.
N "
•H
CO
T3 *°
0)
JJ
CO 80
4J
CO
70
V
6O
*"*
W 50
.c:
bO
•rj ^0
OJ
» 30
S| 20
•H
a_i
CO
iH 10
«3 5
2
1
0.5
0. 1
0.01
-
-
^
,
™
•
—
"
— ^-^
* T'''^
.x^^ /
^^ /
^^ /
^^ / «
/
/
/
/
/
/
' UNCONTROLLED
— •— Weight percent
Emission factor
CONTROLLED
— •— Weight percent
2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90
40
M
B
0)
CO
p.
o
3
i-h
Cu
n
r^
O
CK)
J
20
0
IOC
Aerodynamic
particle
diameter, urn
2.5
6.0
10.0
Cumulative wt. % < stated size
Without
controls
13
29
42
After wet
scrubber control
33
36
39
Emission factor, kg/Mg
Without
controls
7.3
16.2
23.5
After wet
scrubber control
0.59
0.65
0.70
C.1-104
EMISSION FACTORS
10/86
-------
8.xx LIGHTWEIGHT AGGREGATE (SLATE): COAL FIRED ROTARY KILN
NUMBER OF TESTS: a) 3, conducted before control
b) 5, conducted after wet scrubber control
STATISTICS: a) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 13.0 29.0 42.0
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
b) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 33.0 36.0 39.0
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: For uncontrolled source, 56.0 kg parti-
culate/Mg of feed. After wet scrubber control, 1.8 kg particulate/Mg of feed.
Factors are calculated from data in reference.
SOURCE OPERATION: Source produces light weight aggregate from slate in coal
fired rotary kiln and reciprocating grate clinker cooler. During testing
source was operating at a feed rate of 33 tons/hr., 83% rated capacity. Firing
zone temperatures are about 2125°F and kiln rotates at 3.25 RPM.
SAMPLING TECHNIQUE: a. Bacho
b. Andersen Impactor
EMISSION FACTOR RATING: C
REFERENCE:
Emission Test Report, Lightweight Aggregate Industry, Galite Corporation,
EMB-80-LWA-6, U. S. Environmental Protection Agency, Research Triangle
Park, NC, February 1982.
10/86 Appendix C.I C.1-105
-------
8.xx LIGHTWEIGHT AGGREGATE (SLATE): RECIPROCATING GRATE CLINKER COOLER
99.99
99.9
99
98
N *5
•H
CO
•O »
0)
AJ
« 80
4-1
CO
v
70
*-> 50
y 40
30
20
«
10
s
o 5
2
1
0.5
0.1
0.01
CONTROLLED
—•— Weight percent
Emission factor
I I « I In n
0.2
w
en
CO
H-
o
o
01
O
1-1
7?
0.1
\ 5 6 7 8 9 10 20
Particle diameter, urn
30 40 50 60 70 80 90 100
Aerodynamic
particle
diameter, um
2.5
6.0
10.0
Cumulative wt . % < stated size
After settling chamber control
9.8
23.6
41.0
Emission factor, kg/Mg
After
settling chamber control
0.02
0.05
0.09
C.1-106
EMISSION FACTORS
10/86
-------
8.xx LIGHTWEIGHT AGGREGATE (SLATE): RECIPROCATING GRATE CLINKER COOLER
NUMBER OF TESTS: 5, conducted after settling chamber control
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 9.8 23.6 41.0
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: 0.22 kg particulate/Mg of raw material
feed. Factor calculated from data in reference.
SOURCE OPERATION: Source produces lightweight slate aggregate in a cool fired
kiln and a reciprocating grate clinker cooler. During testing, source was
operating at a feed rate of 33 tons/hr, 83% of rated capacity. Firing zone
temperatures are about 2125°F, and kiln rotates at 3.25 rpm.
SAMPLING TECHNIQUE: Andersen Impactors
EMISSION FACTOR RATING: C
REFERENCE:
Emission Test Report, Lightweight Aggregate Industry, Galite Corporation,
EMB-80-LWA-6, U. S. Environmental Protection Agency, Research Triangle
Park, NC, February 1982.
10/86 Appendix C.I C.1-107
-------
8.xx NONMETALLIC MINERALS: TALC PEBBLE MILL
99.99
99.9
99
98
»95
•H
CO
0)
CO 30
4J
CO
v
"§>
70
60
50
40
30
£20
(8
iH 10
Is
0.1
0.01
UNCONTROLLED
—•— Weight percent
Emission factor
25
20
15
rt
3
H-
0)
CO
H-
O
0
O
i-l
ciT
10
3 4 5 6 7 8 9 10 20
Particle diameter, urn
30 40 50 60 70 80 90 100
Aerodynamic
particle
diameter, urn
2.5
6.0
10.0
Cumulative wt. % < stated size
Before controls
30.1
42.4
56.4
Emission factor, kg/Mg
Before controls
5.9
8.3
11.1
C.1-108
EMISSION FACTORS
10/86
-------
8.xx NONMETALLIC MINERALS: TALC PEBBLE MILL
NUMBER OF TESTS: 2, conducted before controls
STATISTICS: Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 30.1 42.4 56.4
Standard deviation (Cum. %): 0.8 0.2 0.4
Min (Cum. %): 29.5 42.2 56.1
Max (Cum. %): 30.6 42.5 56.6
TOTAL PARTICULATE EMISSION FACTOR: 19.6 kg particulate/Mg ore processed.
Calculated from data in reference.
SOURCE OPERATION: Source crushes talc ore then grinds crushed ore in a pebble
mill. During testing, source operation was normal, according to the operators.
An addendum to reference indicates throughput varied between 2.8 and 4.4
tons/hour during these tests.
SAMPLING TECHNIQUE: Sample was collected in an alundum thimble and analyzed
with a Spectrex Prototron Particle Counter Model ILI 1000.
EMISSION FACTOR RATING: E
REFERENCE:
Air Pollution Emission Test, Pfizer, Inc., Victorville, CA, EMB-77-NMM-5,
U. S. Environmental Protection Agency, Research Triangle Park, NC, July
1977.
10/86 Appendix C.I C.1-109
-------
99.99
99.9
99
98
CO
N 95
-0 90
oi
4->
* 80
CO
v 70
6~S 60
£ 50
be
•H 40
01
•* 30
CU
> 20
O
10
5
2
I
0.5
0.1
0.01
10.4 WOODWORKING WASTE COLLECTION OPERATIONS:
BELT SANDER HOOD EXHAUST CYCLONE
CYCLONE CONTROLLED
-•- Weight percent
Emission factor
FABRIC FILTER
—•- Weight percent
3.0
2.0
CD
CO
H-
O
0
Hi
0>
n
(T
o
7?
TO
i.o
n
3 4 5 6 7 8 9 10 .20 30 40 50 60 70 80 90 100
Particle diameter, urn
Aerodynamic
particle
diameter, um
2.5
6.0
10.0
Cumulative wt . % < stated size
Cyclone
29.5
42.7
52.9
After cyclone
and fabric filter
14.3
17.3
32.1
Emission factor, kg/hour
of cyclone operation
After
cyclone collector
0.68
0.98
1.22
C.1-110
EMISSION FACTORS
10/86
-------
10.4 WOODWORKING WASTE COLLECTION OPERATIONS:
BELT SANDER HOOD EXHAUST CYCLONE
NUMBER OF TESTS: a) 1, conducted after cyclone control
b) 1, after cyclone and fabric filter control
STATISTICS: a) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 29.5 42.7 52.9
Standard deviation (Cum. %):
Min (Cum. %):
Max (Cum. %):
b) Aerodynamic particle diameter (urn): 2.5 6.0 10.0
Mean (Cum. %): 14.3 17.3 32.1
Standard deviation (Cum. %) :
Min (Cum. %):
Max (Cum. %):
TOTAL PARTICULATE EMISSION FACTOR: 2.3 kg particulate/hr of cyclone operation.
For cyclone controlled source, this emission factor applies to typical large
diameter cyclones into which wood waste is fed directly, not to cyclones that
handle waste previously collected in cyclones. If baghouses are used for waste
collection, particulate emissions will be negligible. Accordingly, no emission
factor is provided for the fabric filter controlled source. Factors from AP-42.
SOURCE OPERATION: Source was sanding 2 ply panels of mahogany veneer, at 100%
of design process rate of 1110 m^/hr.
SAMPLING TECHNIQUE: a) Joy train with 3 cyclones
b) Sass train with cyclones
EMISSION FACTOR RATING: E
REFERENCE:
Emission test data from Environmental Assessment Data Systems, Fine
Particle Emission Information System, Series Report No. 238, U. S.
Environmental Protection Agency, Research Triangle Park, NC, June 1983.
10/86 Appendix C.I C. 1-111
-------
APPENDIX C.2
GENERALIZED PARTICLE SIZE DISTRIBUTIONS
10/86 Appendix C.2 C.2-1
-------
CONTENTS
Page
C.2.1 Rationale For Developing Generalized Particle
Distributions C.2-3
C.2.2 How To Use The Generalized Particle Size Distributions
For Uncontrolled Processes C.2-3
C.2.3 How To Use The Generalized Particle Size Distributions
For Controlled Processes C.2-17
C.2.4 Example Calculation C.2-17
Tables
C.2-1 Particle Size Cateogry By AP-42 Section C.2-5
C.2-2 Description of Particle Size Categories C.2-8
C.2-3 Typical Collection Efficiencies of Various Particulate
Control Devices (percent) C.2-17
Figures
C.2-1 Example Calculation for Determining Uncontrolled and
Controlled Particle Size Specific Emissions C.2-4
C.2-2 Calculation Sheet C.2-7
References C.2-18
C.2-2
EMISSION FACTORS
10/86
-------
APPENDIX C.2
GENERALIZED PARTICLE SIZE DISTRIBUTIONS
C.2.1 Rationale For Developing Generalized Particle Size Distributions
The preparation of size specific particulate emission inventories
requires size distribution information for each process. Particle size
distributions for many processes are contained in appropriate industry
sections of this document. Because particle size information for many
processes of local impact and concern are unavailable, this Appendix provides
"generic" particle size distributions applicable to these processes. The
concept of the "generic particle size distribution is based on categorizing
measured particle size data from similar processes generating emissions from
similar materials. These generic distributions have been developed from
sampled size distributions from about 200 sources.
Generic particle size distributions are approximations. They should be
used only in the absence of source-specific particle size distributions for
areawide emission inventories.
C.2.2 How To Use The Generalized Particle Size Distributions For
Uncontrolled Processes
Figure C.2-1 provides an example calculation to assist the analyst in
preparing particle size specific emission estimates using generic size
distributions.
The following instructions for the calculation apply to each particulate
emission source for which a particle size distribution is desired and for
which no source specific particle size information is given elsewhere in this
document:
1. Identify and review the AP-42 Section dealing with that process.
2. Obtain the uncontrolled particulate emission factor for the process
from the main text of AP-42, and calculate uncontrolled total
particulate emissions.
3. Obtain the category number of the appropriate generic particle size
distribution from Table C.2-1.
4. Obtain the particle size distribution for the appropriate category
from Table C.2-2. Apply the particle size distribution to the
uncontrolled particulate emissions.
Instructions for calculating the controlled size specific emissions are
given in C.2.3 and illustrated in Figure C.2-1.
10/86 Appendix C.2 C.2-3
-------
Figure C.2-1. EXAMPLE CALCULATION FOR DETERMINING UNCONTROLLED
AND CONTROLLED PARTICLE SIZE SPECIFIC EMISSIONS.
SOURCE IDENTIFICATION
Source name and address: ABC Brick Manufacturing _____
Process description:
AP-42 Section:
Uncontrolled AP-42
emission factor:
Activity parameter:
Uncontrolled emissions:
24 Dusty Way
Anywhere, USA
Dryers/Grinders
8.3, Bricks And Related Clay Products
96 Ibs/ton
63,700 tons/year
3057.6 tons/year
(units)
(units)
(units)
UNCONTROLLED SIZE EMISSIONS
Category name: Mechanically Generated/Aggregate, Unprocessed Ores
Category number: 3
Particle size (ym)
Generic distribution, Cumulative
percent equal to or less than the size:
Cumulative mass
(tons/year) :
particle size emissions
< 2.5
15
458.6
< 6
34
1039.(
< 10
51
1559.4
CONTROLLED SIZE EMISSIONS*
Type of control device: Fabric Filter
Collection efficiency (Table C.2-3):
Mass in size range** before control
(tons/year):
Mass in size range after control
(tons/year):
Cumulative mass (tons/year):
Particle size (urn)
0-2.5 2.5-6 6 - 10
99.0
458.6
4.59
4.59
99.5
581.0
2.91
7.50
99.5
519.8
2.60
10.10
* These data do not include results for the greater than 10 ym particle size range.
** Uncontrolled size data are cumulative percent equal to or less than the size.
Control efficiency data apply only to size range and are not cumulative.
C.2-4
EMISSION FACTORS
10/86
-------
TABLE C.2-1. PARTICLE SIZE CATEGORY BY AP-42 SECTION
AP-42
Section
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
1.11
2.1
2.3
3.2
5.4
5.8
5.10
5.11
5.12
5.16
5.17
6.1
6.2
6.3
6.4
Source Category
External combustion
Bituminous coal combustion
Anthracite coal combustion
Fuel oil combustion
Utility, residual oil
Industrial , residual oil
Utility, distillate oil
Commercial, residual oil
Commerci al, distill ate
Residential, distillate
Natural gas combustion
Liquefied pettoleum gas
Mood waste combustion in
boilers
Lignite, combustion
Bagasse Combustion
Residential fireplaces
Wood stoves
Waste oil combustion
Solid waste disposal
Refuse Incinerators
Conical burners (wood waste)
Internal combustion engine
Highway vehicles
Off highway
Chemical process
Charcoal production
Hydrofluoric acid
Spar drying
Spar handling
Transfer
Paint
Phosphoric acid (thermal
process)
Phthalic anhydride
Sodium carbonate
Sulfuric acid
Food and agricultural
Alfalfa dehydrating
Primary cyclone
Meal collector cyclone
Pellet cooler cyclone
Pellet regrind cyclone
Coffee roasting
Cotton ginning
Feed and grain mills and
elevators
Unloading
Category
Number
a
a
a
a
a
a
a
a
a
a
a
a
a
b
a
a
2
b
2
a
1
9
3
3
3
4
a
9
a
b
b
7
7
7
6
b
b
AP-42
Section
6.5
6.7
6.8
6.10
6.10.3
6.11
6.14
6.16
6.17
6.18
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
7.10
Category
Source Category Number
Food and agricultural (cont.)
Grain elevators
Grain processing
Fermentation
Meat smokehouses
Ammonium nitrate fertilizers
Phosphate fertilizers
Ammonium phosphates
Reactor/aitmoniator-
granulator
Dryer/cooler
Starch manufacturing
Urea manufacturing
Defoliation and harvesting
of cotton
Trailer loading
Transport
Harvesting of grain
Harvesting machine
Truck loading
Field transport
Ammonium sulfate manufacturing
Rotary dryer
Fluidized-bed dryer
Heta11ur9ica1 industry
Primary aluminum production
Bauxite grinding
Aluminum hydroxide calcining
Anode baking furnace
Prebake cell
Vertical Soderberg
Horizontal Soderberg
Coke manufacturing
Primary copper smelting
Ferroalloy production
Iron and steel production
Blast furnace
Slips
Cast house
Sintering
Windbox
Sinter discharge
Basic oxygen furnace
Electee arc furnace
Primary lead smelting
Zinc smelting
Secondary aluminum
Sweating furnace
Smelting
Crucible furnace
Reverberatory furnace
Secondary copper smelting
and alloying
Gray iron foundries
6
7
6&7
9
a
3
4
4
7
3
6
6
6
6
6
b
b
4
5
9
a
8
a
a
a
a
a
a
a
a
a
a
a
8
8
8
a
8
a
a. Categories with particle size data specific to process included in the main body of the text.
b. Categories with particle size data specific to process included in Appendix C.I.
c. Data for each numbered category are shown in Table C.2-2.
d. Highway vehicles data are reported in AP-42 Volume II: Mobile Sources.
10/86
Appendix C.2
C.2-5
-------
TABLE C. 2-1 (continued).
AP-42
Section
7.11
7.12
7.13
7.14
7.15
7.18
Source Category
Metallurgical industry (cont.)
Secondary lead processing
Secondary magnesium smelting
Steel foundaries
melting
Secondary zinc smelting
Storage battery production
Leadbearing ore crushing and
grinding
Mineral products
Category
Number
a
8
b
8
b
4
AP-42
Section Source Category
Mineral products (cont.)
Impact mill
Flash calciner
Continuous kettle calciner
8.15 Lime manufacturing
8.16 Mineral wool manufacturing
Cupola
Reverberatory furnace
Blow chamber
Curing oven
Cooler
Category
Number
4
a
a
a
8
8
8
9
9
8.5
8.6
8.7
8.8
8.9
8.10
8.11
8.13
8.14
Asphaltic concrete plants
Process a
Bricks and related clay
products
Raw materials handling
Dryers, grinders, etc. b
Tunnel/periodic kilns
Gas fired a
Oil fired a
Coal fired a
Castable refractories
Raw material dryer 3
Raw material crushing and
screening 3
Electric arc melting 8
Curing oven 3
Portland cement manufacturing
Dry process
Kilns a
Dryers, grinders, etc. 4
Wet process
Kilns a
Dryers, grinders, etc. 4
Ceramic clay manufacturing
Drying 3
Grinding 4
Storage 3
Clay and fly ash sintering
Fly ash sintering, crushing,
screening and yard storage 5
Clay mixed with coke
Crushing, screening, and
yard storage 3
Coal cleaning 3
Concrete batching 3
Glass fiber manufacturing
Unloading and conveying 3
Storage bins 3
Mixing and weighing 3
Class furnace - wool a
Glass furnace - textile a
Glass manufacturing a
Gypsum manufacturing
Rotary ore dryer a
Roller mill 4
8.18 Phosphate rock processing
Drying a
Calcining a
Grinding b
Transfer and storage 3
8.19.1 Sand and gravel processing
Continuous drop
Transfer station a
Pile formation - stacker a
Batch drop a
Active storage piles a
Vehicle traffic unpaved road a
8.19.2 Crushed stone processing
Dry crushing
Primary crushing a
Secondary crushing
and screening a
Tertiary crushing
and screening 3
Recrushing and screening 4
Fines mill 4
Screening, conveying,
and handling a
8.22 Taconite ore processing
Fine crushing 4
Waste gas a
Pellet handling 4
Grate discharge 5
Grate feed 4
Bentonite blending 4
Coarse crushing 3
Ore transfer 3
Bentonite transfer 4
Unpaved roads a
8.23 Metallic minerals processing a
8.24 Western surface coal mining a
Wood processing
10.1 Chemical wood pulping a
Miscellaneous sources
11.2
Fugitive dust
a.
b.
Categories with particle size data specific to process included in the main body of the text.
Categories with particle size data specific to process Included in Appendix C.I.
Data for each numbered category are shown in Table C.2-2.
C.2-6
EMISSION FACTORS
10/86
-------
Figure C.2-2. CALCULATION SHEET.
SOURCE IDENTIFICATION
Source name and address:
Process description:
AP-42 Section:
Uncontrolled AP-42
emission factor:
Activity parameter:
Uncontrolled emissions:
_(units)
_(units)
(units)
UNCONTROLLED SIZE EMISSIONS
Category name:
Category number:
Particle size (vim)
< 2.5 < 6
Generic distribution, Cumulative
percent equal to or less than the size:
Cumulative mass j< particle size emissions
(tons/year):
< 10
CONTROLLED SIZE EMISSIONS*
Type of control device:
Particle size (um)
0-2.5 2.5-6 6 - 10
Collection efficiency (Table C.2-3):
Mass in size range** before control
(tons/year):
Mass in size range after control:
(tons/year):
Cumulative mass (tons/year):
* These data do not include results for the greater than 10 vim particle size range.
** Uncontrolled size data are cumulative percent equal to or less than the size.
Control efficiency data apply only to size range and are not cumulative.
10/86
Appendix C.2
C.2-7
-------
TABLE C.2-2. DESCRIPTION OF PARTICLE SIZE CATEGORIES
Category: 1
Process: Stationary Internal Combustion Engines
Material: Gasoline and Diesel Fuel
Category 1 covers size specific emissions from stationary internal
combustion engines. The particulate emissions are generated from fuel
combustion.
REFERENCE: 1, 9
1/1
o
W!
V
Of
UJ
o.
yj
98
95
90
80
70
60
50
dn
i
-
-
-
-
i i i
—
- -^
i i i " "
-
^^---"
-
.
-
-
-
i iii
i i i i
2 345
PARTICLE DIAMETER,
10
Particle
size, um
Cumulative %
less than or equal
to stated size
(uncontrolled)
Minimum Maximum Standard
Value Value Deviation
1.0e
2.0*
2.5
3.0£
4.0
5.0£
6.0
10.0
a
82
88
90
90
92
93
93
96
78
86
92
99
99
99
11
7
4
Value calculated from data reported at 2.5, 6.0, and 10.0 um. No
statistical parameters are given for the calculated value.
C.2-8
EMISSION FACTORS
10/86
-------
TABLE C.2-2 (continued).
Category: 2
Process: Combustion
Material: Mixed Fuels
Category 2 covers boilers firing a mixture of fuels, regardless of the
fuel combination. The fuels include gas, coal, coke, and petroleum.
Particulate emissions are generated by firing these miscellaneous fuels.
REFERENCE: 1
o
UJ
t—
«t
95
90
80
70
60
50
40
30
20
10
2345
PARTICLE DIAMETER,
10
Particle
size, ym
1.0
2.0£
2.5
4.0
5.0C
6.0
10.0
Cumulative %
less than or equal
to stated size Minimum Maximum Standard
(uncontrolled) Value Value Deviation
23
40
45 32 70 17
50
58
64
70 49 84 14
79 56 87 12
Value calculated from data reported at 2.5, 6.0, and 10.0 ym. No
statistical parameters are given for the calculated value.
10/86
Appendix C.2
C.2-9
-------
TABLE C.2-2 (continued).
Category: 3
Process: Mechanically Generated
Material: Aggregate, Unprocessed Ores
Category 3 covers material handling and processing of aggregate and
unprocessed ore. This broad category includes emissions from milling,
grinding, crushing, screening, conveying, cooling, and drying of material.
Emissions are generated through either the movement of the material or the
interaction of the material with mechanical devices.
REFERENCE: 1-2, 4, 7
•t.
H-
l/l
a.
UJ
I
90
80
70
60
50
40
30
20
10
5
2
I 1 I l II1TT
2345 10
PARTICLE DIAMETER, ^m
Cumulative %
less than or equal
Particle to stated size
size, ym (uncontrolled)
Minimum
Value
Maximum
Value
Standard
Deviation
1.0C
2.0£
2.5
3.0
4.0£
5.0*
6.0
10.0
a
4
11
15
18
25
30
34
51
15
23
35
65
81
Value calculated from data reported at 2.5, 6.0, and 10.0 ym.
statistical parameters are given for the calculated value.
13
14
No
C.2-10
EMISSION FACTORS
10/86
-------
TABLE C.2-2 (continued).
Category: 4
Process: Mechanically Generated
Material: Processed Ores and Non-metallic Minerals
Category 4 covers material handling and processing of processed ores and
minerals. While similar to Category 3, processed ores can be expected to have
a greater size consistency than unprocessed ores. Particulate emissions are
a result of agitating the materials by screening or transfer, during size
reduction and beneficiation of the materials by grinding and fine milling, and
by drying.
REFERENCE: 1
Particle
size, vim
i.oa
2.0a
2.5
3.0?
4.0
5.0£
6.0
10.0
a
I/O
o
95
90
80
70
60
50
40
30
20
10
5
2
1
0.5
t i i i i
2345
PARTICLE DIAMETER,
Cumulative %
less than or equal
to stated size Minimum
(uncontrolled) Value
6
21
30 1
36
48
58
62 17
85 70
10
Maximum
Value
51
83
93
Standard
Deviation
19
17
7
Value calculated from data reported at 2.5, 6.0, and 10.0 um. No
statistical parameters are given for the calculated value.
10/86
Appendix C.2
C.2-11
-------
TABLE C.2-2 (continued).
Category:
Process:
Material:
Calcining and Other Heat Reaction Processes
Aggregate, Unprocessed Ores
Category 5 covers the use of calciners and kilns in processing a variety
of aggregates and unprocessed ores. Emissions are a result of these high
temperature operations.
REFERENCE: 1-2, 8
90
W 80
c/>
a 70
UJ
5 60
" 50
V
g 40
LU
a 30
UJ
*• 20
UJ
>
S 10
I 5
2
IIIIFT
1
J_
J_
I
I I I I
2 345
PARTICLE DIAMETER,
10
Particle
size, ym
1.0'
2.0
2.5
3.0'
4.0
5.0£
6.0
10.0
a
a
Cumulative %
less than or equal
to stated size Minimum Maximum Standard
(uncontrolled) Value Value Deviation
6
13
18 3 42 11
21
28
33
37 13 74 19
53 25 84 19
Value calculated from data reported at 2.5, 6.0, and 10.0 vim.
statistical parameters are given for the calculated value.
No
C.2-12
EMISSION FACTORS
10/86
-------
TABLE C.2-2 (continued).
Category:
Process:
Material:
Grain Handling
Grain
Category 6 covers various grain handling (versus grain processing)
operations. These processes could include material transfer, ginning and
other miscellaneous handling of grain. Emissions are generated by mechanical
agitation of the material.
REFERENCE: 1, 5
*f
_j
ZD
IE
30
20
10
5
2
1
0.5
0.2
0.1
0.05
0.01
I I i I I
2345
PARTICLE DIAMETER,
10
Particle
size, ym
i.oa
2.0a
2.5
3.0a
4.0a
5.0a
6.0
10.0
Cumulative %
less than or equal
to stated size Minimum Maximum
(uncontrolled) Value Value
.07
.60
1 0 2
2
3
5
7 3 12
15 6 25
Standard
Deviation
3
7
Value calculated from data reported at 2.5, 6.0, and 10.0 urn.
statistical parameters are given for the calculated value.
No
10/86
Appendix C.2
C.2-13
-------
TABLE C.2-2 (continued).
Category:
Process:
Material:
7
Grain Processing
Grain
Category 7 covers grain processing operations such as drying, screening,
grinding and milling. The particulate emissions are generated during
forced air flow, separation or size reduction.
REFERENCE: 1-2
80
70
60
50
40
30
20
10
T III IT
I 1 l I
2345 10
PARTICLE DIAMETER, \m
Particle
size, urn
i.oa
2.0a
2.5
3-°
4.0
5.0
6.0
10.0
Cumulative %
less than or equal
to stated size Minimum Maximum
(uncontrolled) Value Value
8
18
23 17 34
27
34
40
43 35 48
61 56 65
Standard
Deviation
7
5
Value calculated from data reported at 2.5, 6.0, and 10.0 ym. No
statistical parameters are given for the calculated value.
C.2-14
EMISSION FACTORS
10/86
-------
TABLE C.2-2 (continued).
Category: 8
Process: Melting, Smelting, Refining
Material: Metals, except Aluminum
Category 8 covers the melting, smelting, and refining of metals (in-
cluding glass) other than aluminum. All primary and secondary production
processes for these materials which involve a physical or chemical change are
included in this category. Materials handling and transfer are not included.
Particulate emissions are a result of high temperature melting, smelting, and
refining.
REFERENCE: 1-2
l/l
o
on
UJ
O-
99
98
95
90
80
70
60
50
40
2 345
PARTICLE DIAMETER,
10
Cumulative %
less than or equal
Particle to stated size Minimum Maximum Standard
size, um (uncontrolled) Value Value Deviation
1.0a 72
2.0a 80
2.5 82 63 99 12
3.0a 84
4.0a 86
5.0a 88
6.0 89 75 99 9
10.0 92 80 99 7
Value calculated from data reported at 2.5, 6.0, and 10.0 um. No
statistical parameters are given for the calculated value.
10/86 Appendix C.2
C.2-15
-------
TABLE C.2-2 (continued).
Category:
Process:
Material:
Condensation, Hydration, Absorption, Prilling and Distillation
All
Category 9 covers condensation, hydration, absorption, prilling, and
distillation of all materials. These processes involve the physical separa-
tion or combination of a wide variety of materials such as sulfuric acid and
ammonium nitrate fertilizer. (Coke ovens are included since they can be con-
sidered a distillation process which separates the volatile matter from coal
to produce coke.)
REFERENCE: 1, 3
«t
I
s:
99
98
95
90
80
70
60
50
40
I
I
I i l i i i
2 345
PARTICLE DIAMETER,
10
Cumulative %
less than or equal
Particle to stated size Minimum Maximum Standard
size, urn (uncontrolled) Value Value Deviation
1.0a 60
2.0a 74
2.5 78 59 99 17
3.0a 81
4.0a 85
5.0E 88
6.0 91 61 99 12
10.0 94 71 99 9
Value calculated from data reported at 2.5, 6.0, and 10.0 \im.
statistical parameters are given for the calculated value.
No
C.2-16
EMISSION FACTORS
10/86
-------
C.2.3 How To Use The Generalized Particle Size Distributions For
Controlled Processes
To calculate the size distribution and the size specific emissions for a
source with a particulate control device, the user first calculates the
uncontrolled size specific emissions. Next, the fractional control efficiency
for the control device is estimated, using Table C.2-3. The Calculation Sheet
provided (Figure C.2-2) allows the user to record the type of control device
and the collection efficiencies from Table C.2-3, the mass in the size range
before and after control, and the cumulative mass. The user will note that
the uncontrolled size data are expressed in cumulative fraction less than the
stated size. The control efficiency data apply only to the size range
indicated and are not cumulative. These data do not include results for the
greater than 10 ym particle size range. In order to account for the total
controlled emissions, particles greater than 10 um in size must be included.
C.2.4 Example Calculation
An example calculation of uncontrolled total particulate emissions,
uncontrolled size specific emissions, and controlled size specific emission is
shown on Figure C.2-1. A blank Calculation Sheet is provided in Figure C.2-2.
TABLE C.2-3
TYPICAL COLLECTION EFFICIENCIES OF VARIOUS
PARTICULATE CONTROL DEVICES.3'
(percent)
Type of collector
Baffled settling chamber
Simple (high-throughput) cyclone
High-efficiency and multiple cyclones
Electrostatic precipitator (ESP)
Packed-bed scrubber
Venturi scrubber
Wet-impingement scrubber
Fabric filter
Particle size, ym
0 - 2.5
NR
50
80
95
90
90
25
99
2.5 - 6
5
75
95
99
95
95
85
99.5
6-10
15
85
95
99.5
99
99
95
99.5
The data shown represent an average of actual efficiencies. The efficien-
cies are representative of well designed and well operated control equipment.
Site specific factors (e.g., type of particulate being collected, varying
pressure drops across scrubbers, maintenance of equipment, etc.) will affect
the collection efficiencies. The efficiencies shown are intended to provide
guidance for estimating control equipment performance when source-specific
data are not available.
Reference: 10
NR = Not reported.
10/86
Appendix C.2
C.2-17
-------
References for Appendix C.2
1. Fine Particle Emission Inventory System, Office of Research and
Development, U. S. Environmental Protection Agency, Research Triangle
Park, NC, 1985.
2. Confidential test data from various sources, PEI Associates, Inc.,
Cincinnati, OH, 1985.
3. Final Guideline Document: Control of Sulfuric Acid Production Units,
EPA-450/2-77-019, U. S. Environmental Protection Agency, Research
Triangle Park, NC, 1977.
4. Air Pollution Emission Test, Bunge Corp., Destrehan, LA., EMB-74-GRN-7,
U. S. Environmental Protection Agency, Research Triangle Park, NC, 1974.
5. I. W. Kirk, "Air Quality in Saw and Roller Gin Plants", Transactions of
the ASAE, 20:5, 1977.
6. Emission Test Report, Lightweight Aggregate Industry, Galite Corp.,
EMB-80-LWA-6, U. S. Environmental Protection Agency, Research Triangle
Park, NC, 1982.
7. Air Pollution Emission Test, Lightweight Aggregate Industry, Texas
Industries, Inc., EMB-80-LWA-3, U. S. Environmental Protection Agency,
Research Triangle Park, NC, 1975.
8. Air Pollution Emission Test, Empire Mining Company, Palmer, Michigan,
EMB-76-IOB-2, U. S. Environmental Protection Agency, Research Triangle
Park, NC, 1975.
9. H. Taback , et al., Fine Particulate Emission from Stationary Sources in
the South Coast Air Basin, KVB, Inc., Tustin, CA 1979.
10. K. Rosbury, Generalized Particle Size Distributions for Use in Preparing
Particle Size Specific Emission Inventories, U. S. Environmental
Protection Agency, Contract No. 68-02-3890, PEI Associates, Inc., Golden,
CO, 1985.
*U.S. GOVERNMENT PRINTING OFFICE:1986-726-611
C.2-18 EMISSION FACTORS 10/86
-------
TECHNICAL REPORT DATA
(Please read Instructions on the reiersi before completing)
1
4.
7
9.
12
15
REPORT NO. |2
AP-42, Supplement A j
TITLE AND SUBTITLE
Supplement A to Compilation Of Air Pollutant Emission
Factors, AP-42, Fourth Edition
AUTHOR(S)
PERFORMING ORGANIZATION NAME AND ADDRESS
U. S. Environmental Protection Agency
Office Of Air And Radiation
Office Of Air Quality Planning And Standards
Research Triangle, KG 27711
. SPONSORING AGENCY NAME AND ADDRESS
3. RECIPIENT'S ACCESSION NO.
5. REPORT DATE
October 1986
6. PERFORMING ORGANIZATION CODE
8. PERFORMING ORGANIZATION REPORT NO.
10. PROGRAM ELEMENT NO.
11. CONTRACT/GRANT NO.
13. TYPE OF REPORT AND PERIOD COVERED
14. SPONSORING AGENCY CODE
. SUPPLEMENTARY NOTES
EPA Editor: Whitmel M. Joyner
16. ABSTRACT
In this Supplement to the Fourth Edition of AP-42, new or revised emissions
data are presented for Bituminous And Subbituminous Coal Combustion; Anthracite Coal
Combustion; Fuel Oil Combustion; Natural Gas Combustion; Wood Waste Combustion In
Boilers; Lignite Combustion; Sodium Carbonate; Primary Aluminum Production; Coke
Production; Primary Copper Smelting; Ferroalloy Production; Iron And Steel Production
Primary Lead Smelting; Zinc Smelting; Secondary Aluminum Operations; Gray Iron
Foundries; Secondary Lead Smelting; Asphaltic Concrete Plants; Bricks And Related
Clay Products; Portland Cement Manufacturing; Concrete Batching; Glass Manufacturing;
Lime Manufacturing; Construction Aggregate Processing; Taconite Ore Processing;
Western Surface Coal Mining; Chemical Wood Pulping; Appendix C.I, 'Particle Size
Distribution Data And Sized Emission Factors For Selected Sources"; and Appendix C.2,
"Generalized Particle Size Distributions".
17. KEY WORDS AND DOCUMENT ANALYSIS
a. DESCRIPTORS
Stationary Sources
Point Sources
Area Sources
Emission Factors
Emissions
18. DISTRIBUTION STATEMENT
b. IDENTIFIERS/OPEN ENDED TERMS
19. SECURITY CLASS (This Report]
20 SECURITY CLASS (This page)
c. COSATI Held/Group
21. NO. OF PAGES
460
22. PRICE
EPA Form 2220-1 (Rev. 4-77) PREVIOUS EDITION is OBSOLETE
-------
U.S. Environmental Protection Agency
Region V, Library
230 South Dearborn Street
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-------