Method of making sponge metal

Details Method of making sponge metal Method of making sponge metal

1981-02-13

1983-03-08

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 90R, 75 91, 266156, C21B 1302

Patent

active

043759831

ABSTRACT:
A method for the batchwise reduction of iron ore to sponge iron in a multiple unit reactor system is disclosed in which (a) separate fixed beds of iron-bearing material are simultaneously treated in at least one cooling reactor and at least two reduction reactors, (b) a reducing gas composed largely of carbon monoxide and hydrogen is used to cool the iron-bearing material in said cooling reactor and thereafter to reduce the iron-bearing material in said reduction reactors, (c) a stream of said reducing gas is caused to pass through the fixed bed of iron ore in said cooling reactor and then cooled and (d) a portion of the cooled effluent reducing gas from said cooling reactor is recycled thereto, the improvement which comprises causing the remainder of the cooling reactor effluent gas to be fed to said reduction reactors and to flow in parallel through the fixed beds of metal-bearing material in said reduction reactors, and heating the reducing gas fed to said reduction reactors before it enters said reactors in a gas superheater without combustion of said gas to a temperature of at least 900.degree. C.

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