Chromite recovery from chromite-bearing ore

Details Chromite recovery from chromite-bearing ore Chromite recovery from chromite-bearing ore

C - Chemistry, Metallurgy

22

B

53/119, 53/304

C22B 34/32 (2006.01)

Patent

CA 1070503

Abstract of Disclosure A method is provided for separating chromium from lateritic ore. The ore which generally also contains nickel and cobalt along with other metal values is leached with a strong sulfuric acid solution of about 10 to 30 normal concen- tration at an acid to ore ratio of at least 3:1 by weight. The leaching is carried out at a temperature of at least 100°C ranging as high as about 300°C at above atmospheric pressure. An oxidant, such as manganese dioxide, is preferably added to oxidize the chromium to the hexavalent state, the manganese dioxide, or its equivalent, being advantageous in improving the chromium yield at the lower end of the leaching temperature range.

233973

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