Method for the production of ferrochromium

Details Method for the production of ferrochromium Method for the production of ferrochromium

1982-07-29

1983-11-08

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

266173, C22C 3300

Patent

active

044140266

ABSTRACT:
Described is a method for the production of ferrochromium and a rotary furnace employed in such method. Raw chromium ores, fluxes and carbonaceous reducing agent(s) are charged into a rotary furnace into which oxygen or oxygen-enriched air are blown to effect smelting reduction. The layer height of the carbonaceous reducing agent and the time interval during which the layer height should be kept are specified, the reducing agent is used in circulation, while exhaust gases are utilized for pre-heating and pre-reducing of the materials for saving the energy considerably in contrast to the conventional method. The rotary furnace has plural gas-blowing, small holes passing through the furnace shell and the refractory lining. These holes may be arranged as a dual pipe whereby cooling air, fuel or a fuel-oxygen mixture may be blown or an oxidizing gas and a cooling gas such as argon may be blown through the inner pipe and the outer pipe respectively.

REFERENCES:
patent: 3791819 (1974-02-01), Loutzenhiser
patent: 3912501 (1975-10-01), De Castejon

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