Processing of chromium ore

Details Processing of chromium ore Processing of chromium ore

C - Chemistry, Metallurgy

01

G

23/233

C01G 37/02 (2006.01)

Patent

CA 1109641

PROCESSING OF CHROMIUM ORE ABSTRACT OF THE DISCLOSURE Method for the recovery of chrome hydrate or high purity Cr2O3 from chromium ores by roasting the ore with Na2CO3 and CaO, water leaching the roasted mass, precipitating aluminum impurities from the leach liquor as Al(OH)3 and contacting the leach liquor with sulfur and NaOH in order to reduce the chromium values in the leach liquor from valence 6 to 3 to provide a chrome hydrate precipitate. The chrome hydrate precipi- tate is acid repulped to provide a chrome hydrate from which sodium impurities have been removed. The chrome hydrate is dried and the resulting solids are calcined to provide a high purity Cr2O3.

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