Leaching of nickeliferous oxide ores containing iron and/or...

Details Leaching of nickeliferous oxide ores containing iron and/or... Leaching of nickeliferous oxide ores containing iron and/or...

C - Chemistry, Metallurgy

22

B

53/304

C22B 19/04 (2006.01) C01G 53/10 (2006.01) C22B 3/00 (2006.01)

Patent

CA 1103039

ABSTRACT OF THE DISCLOSURE Nickel values contained in oxidic ores are re- covered by leaching with sulfuric acid. The ore is slurried with water, preheated to a leaching temperature between about 230°C. and about 300°C. and the preheated slurry is fed to one or more vigorously agitated autoclaves, operating contin- uously in series. Sulfuric acid is added incrementally to the preheated slurry to minimize the amount of iron and aluminum in solution until between about 0.15 part and about 0.8 part of acid per part of dry ore is added to the slurry, thereby minimizing the deposition of scale in the autoclaves.

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