Recovery of nickel from nickeliferous sulfide material

Details Recovery of nickel from nickeliferous sulfide material Recovery of nickel from nickeliferous sulfide material

C - Chemistry, Metallurgy

22

B

53/306

C22B 23/02 (2006.01) C22B 3/28 (2006.01) C22B 3/38 (2006.01)

Patent

CA 1143573

ABSTRACT OF THE DISCLOSURE Nickeliferous sulfidic materials containing at least one other metal selected from the group consisting of cobalt, copper and iron are leached with an at least 3N hydro- chloric acid solution to produce a pregnant nickel chloride solution. The pregnant nickel chloride solution is treated with a liquid organic extractant to extract the other metals. The nickel chloride raffinate is concentrated with respect to nickel chloride, and the concentrated nickel chloride solution is heated to at least about 750°C. to hydrolyze the nickel chloride to a refined nickel oxide product and a hydro- gen chloride-containing gaseous effluent which is recycled to the concentration step and then through water to regener- ate the leaching solution.

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