Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1981-01-21
1983-01-18
Andrews, M. J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
266173, C21B 1308
Patent
active
043690599
ABSTRACT:
Before iron oxide-containing materials is 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-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.
REFERENCES:
patent: 1338439 (1920-04-01), Greenwood
patent: 1558262 (1925-10-01), Greenwood
patent: 2089782 (1937-08-01), Carlsson
patent: 2964308 (1960-12-01), Walde
Elsenheimer Gerd
Schnabel Wolfram
Andrews M. J.
Metallgesellschaft Aktiengesellschaft
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