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Flash Reduction of Iron Ore in a Coil Reactor.

Davis-EG; Feld-IL

NTIS: PB 209 541 :10 pages

10008865

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.

19720101

IH; Report of Investigation;

1972

PB-209541

A02

RI 7627

TURC;

NTIS: PB 209 541

AL;