Process of directly reducing iron oxide-containing materials...

Details Process of directly reducing iron oxide-containing materials... Process of directly reducing iron oxide-containing materials...

C - Chemistry, Metallurgy

21

B

53/30

C21B 13/08 (2006.01)

Patent

CA 1147965

ABSTRACT OF THE DISCLOSURE: Before iron oxide-containing materials are reduced in a rotary kiln by a treatment with solid carbonaceous reducing agents below the melting point of the charge, the iron oxide containing material and carbonaceous reducing agent are preheated in a multiple-hearth furnace, in which the reducing agent is subjected to an at least partial coking or an at least partial low-temperature carbonization. To prevent a partial reduction and sintering, the iron oxide-containing material is preheated in the upper part of the multiple-hearth furnace and the solid carbonaceous reducing agent is separately preheated in the lower part of the multiple-hearth furnace. At least part of the gases produced by the low-temperature carbonization in the lower part of the multiple-hearth furnace is caused to flow in the upper part of said furnace in a countercurrent to the iron oxide-containing material to supply the heat required in said upper part.

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