Toyo Soda Manufacturing Co., Ltd.

Satoru Tenma

Hiroshi Miyake

Nobuyoshi Sato

Akira Honda

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.

Growing community of inventors

Yamagata, Japan

Satoru Tenma