Process for producing metallic chromium

Details Process for producing metallic chromium Process for producing metallic chromium

1978-07-06

1979-04-24

Ozaki, G.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75 11, 75 27, 75114, 75101BE, 75 84, 75121, 75101BE;101R;121;84, C22B 3432

Patent

active

041509757

ABSTRACT:
Disclosed is a process for producing metallic chromium from a chromium- and iron-containing ore. First, the chromium- and iron-containing ore is subjected to carbon reduction to obtain a ferro-chrome; secondly, the ferro-chrome is treated with a chlorinating agent, such as aqueous hydrochloric acid, to obtain an aqueous solution containing chromium chloride and ferrous chloride; thirdly, the ferrous ion present in the aqueous chlorinated solution is oxidized into a ferric ion; fourthly, the aqueous ferric ion-containing solution is contacted with an extractant to extract the ferric ion therefrom; fifthly, the extraction residue, i.e. an aqueous chromium chloride solution, or powdered chromium chloride obtained therefrom, is treated in an oxidizing atmosphere maintained at 500.degree.-1,400.degree. C. by an oxidizing flame where the chromium chloride is roasted to be thereby converted to chromic oxide, and; finally, the chromic oxide is reduced into metallic chromium, preferably by a carbon reduction procedure carried out in two stages.

REFERENCES:
patent: 49682 (1865-08-01), Margulies
patent: 1826261 (1931-10-01), Simpson
patent: 2381236 (1945-08-01), Udy
patent: 3301669 (1967-01-01), Rathmann et al.
patent: 3658507 (1972-04-01), Gohin et al.
patent: 3861903 (1975-01-01), Coyle et al.
patent: 3875285 (1975-04-01), Nymann et al.

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