Treatment of high nickel slimes

Details Treatment of high nickel slimes Treatment of high nickel slimes

C - Chemistry, Metallurgy

22

B

53/285, 53/304

C22B 3/08 (2006.01) B01F 1/00 (2006.01) C01G 53/10 (2006.01) C22B 3/00 (2006.01) C22B 7/00 (2006.01) C22B 15/00 (2006.01) C22B 23/00 (2006.01)

Patent

CA 2014733

A two-stage process for treating anode slimes and other residues containing a substantial amount of nickel without significant dissolution of silver and/or selenium in a single autoclave is disclosed. The process comprises, in a first stage, leaching the anode slimes at 15-30% solids in dilute sulphuric acid at a pressure between 4.0 and 5.5 bars and a temperature between 155°C to 170°C in the absence of oxygen to syllables nickel, and in a second stage, without performing a solid liquid separation, leaching the remaining solids at a pressure between 2 and 3.5, preferably about 2.8 bars and a temperature between 110 and 140°C, preferably about 120°C with oxygen sparging such that the final sulphuric acid concentration is not less than 50 gpl to solubilize copper and tellurium.

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