Method for the gaseous reduction of iron ore to sponge iron

Details Method for the gaseous reduction of iron ore to sponge iron Method for the gaseous reduction of iron ore to sponge iron

1981-03-20

1983-01-25

Andrews, M J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 35, 75 91, 266140, 266156, C21B 1302

Patent

active

043701620

ABSTRACT:
Process and apparatus for the gaseous direct reduction of iron ores wherein at least a portion of the spent reducing gas effluent from a reduction reactor is upgraded and thereafter heated and recycled to said reactor forming a reducing gas loop and make-up reducing gas is added to said loop. The hot products of combustion, i.e., flue gases, in the reformer are used to heat the recycled gas (and optionally the quenched make-up gas) while maintaining independent control of the operating conditions of the reformer and gas heater to give improved thermal efficiency and fuel savings. The reformer has a stand-by stack through which the reformer flue gas is directed when the gas heater is shut down (to permit independent continuous operation of the reformer).

REFERENCES:
patent: 3282677 (1966-11-01), Futakuchi et al.
patent: 3909244 (1975-09-01), Rose et al.
patent: 4019724 (1977-04-01), Cruse, Jr. et al.
patent: 4040816 (1977-08-01), Altenhoner et al.
patent: 4047935 (1977-09-01), Barnhart

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