Instructional Manual For Clarification Of Startup In Source Categories Affected By New Source Performance Standards - U.s. Environmental Protection Agency - 1979 Page 120
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146 Introduction
FERROALLOY PRODUCTION FACILITIES - SUBPART Z
§60.260 - 60.266
The Standards of Performance for Ferroalloy Production Facilities affect:
(1) electric submerged arc furnaces which produce silicon metal. ferrosilicon,
calcium silicon, silicomanganese zirconium,
ferro~hrome
silicon. silvery iron,
h1gh-carbon ferrochrome, charge chrome. standard ferromanganese, silicomanganese,
ferromanganese silicon, or calcium carbide; (2) and dust handling equipment.
The pollutants regulated are particulates and carbon monoxide.
Owners or operst.ors are not permitted to discharge from any electric "sub-
merged arc furnace any gases into the atmosphere which: (1) exit from a control
device and contain particulate matter in excess of 0.45 kg/MW-hr (0.99 lb/MW-hr)
while silicon metal, ferrosilicon, calcium silicon, or silicomanganese zirconium
is heing produced. (2) exit from a control device and contain particulate mat-
ter in excess of O.23kg/MW-hr (0.51 lb/MW-hr) while high-carbon ferrochrome.
charge chrome, standard ferromanganese, silico-manganese, calcium carbide,
ferrochrome silicon, ferromanganese silicon or silvery iron is produced.
(3)
exit from a control.device and exhibit 15 percent opacity or greater,
(4)
exit and escape the capture system and are visible without the aid of
instruments (applies only during periods when flow rates are being established),
('»
escape the capture system at the tapping station and are visible without
the aid of instruments for more than 40 percent of each tapping period.
There
are no Hmitations on visible emissions when a blowing tap occurs (requirements
apply only during periods when flow rates are being established).
Dust handling equipment emissions are limited to less than 10 percent
opacity.
Carbon monoxide from any electric submerged arc furnace is limited
to less than 20 percent by volume (dry basis).
A continuous monitoring sys-
tem is required to monitor opacity of emissions discharged from the control
device.
Sources constructed, reconstructed or modified after 21 October 1974 are
Rubject to the regulations.
Process Description
Ferroalloy il'l a material consisting of iron and one or more other metals.
Ferroa] loys are used in steel .production as alloying" elements and deoxidants.
There are three types of ferroal10ys:
silicon-based; manganese-based; and
chromium-oased alloys.
There are four major procedures used to produce ferro-
alloy:
blaRt furnaces, electrolytic depoSition, alumina si1ico-thermicprocess,
and
electric smelting.
However, the primary system used is electric smelting.
lOB
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