Nickel recovery from sulfur-deficient mattes

Details Nickel recovery from sulfur-deficient mattes Nickel recovery from sulfur-deficient mattes

C - Chemistry, Metallurgy

25

C

204/72

C25C 1/08 (2006.01) C01G 53/04 (2006.01)

Patent

CA 1107678

ABSTRACT OF THE DISCLOSURE A nickel matte in which the atomic ratio of S:(Ni + Co + Cu) is less than 0.7 is fragmented and slur- ried with water or an aqueous nickel sulfate solution to ensure that the S:(Ni + Co + Cu) ratio for the slurry as a whole exceeds 004, the slurry is heated under pressure in the presence of oxygen to form a basic nickel sulfate and the reacted slurry is treated with lime to convert the basic nickel sulfate to nickel hydroxide. The nickel hydroxide is then separated from gypsum by physical sepa- ration and thereafter dissolved in spent sulfate electrolyte to generate fresh electrolyte from which nickel can be electrowon.

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