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Flash Reduction of Iron Ore in a Coil Reactor.

Authors
Davis-EG; Feld-IL
Source
NTIS: PB 209 541 :10 pages
Link
NIOSHTIC No.
10008865
Abstract
The flash reduction of fine iron ore in a dilute-phase system was investigated at 500 deg to 900 deg c within a heated stainless steel tubular coil. Alabama brown iron ore and Mesabi semitaconite ore were fed into the coil concurrently with reducing gases of hydrogen and reformed natural gas, so that the velocity of the gas at the reaction temperature was sufficient to entrain and pneumatically transport the solids through the coil. Reduction is very rapid with retention time of the ore in the coil varying from 4 to 15 seconds. Variables affecting reduction are temperature, ore feed rate, and gas flow or velocity. Results of the studies show that a partially reduced product (10- to 25-percent reduction) can be made which, on subsequent magnetic concentration, yields a concentrate containing 64 to 70 percent iron with a 90- to 94-percent iron recovery. Maximum reduction of 77 percent was obtained when hydrogen was used in a four-stage reduction test to yield a product containing 61 percent metallic iron. Work done in cooperation with the University of Alabama.
Publication Date
19720101
Document Type
IH; Report of Investigation;
Fiscal Year
1972
NTIS Accession No.
PB-209541
NTIS Price
A02
Identifying No.
RI 7627
NIOSH Division
TURC;
Source Name
NTIS: PB 209 541
State
AL;
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