Cathodic dissolution of cobaltic hydroxide

Details Cathodic dissolution of cobaltic hydroxide Cathodic dissolution of cobaltic hydroxide

C - Chemistry, Metallurgy

25

C

204/71

C25C 1/08 (2006.01) C25B 1/00 (2006.01)

Patent

CA 1135213

ABSTRACT OF THE DISCLOSURE A method is provided for the recovery of cobalt from nickel solu- tions, wherein cobalt is separated from said solution as a precipitate con- taining cobaltic hydroxide precipitate and also containing nickel, the method comprising dissolving the precipitate for the subsequent recovery of cobalt therefrom by reducing trivalent metal in said precipitate to the divalent state. This is achieved by forming an aqueous slurry of said precipitate acidified with sulfuric acid to a pH ranging from about 0.1 to 2, subjecting the precipitate of said aqueous slurry to electrolytic reduction at the cath- ode of an electrolytic cell having an insoluble anode, said precipitate being isolated from said anode during said electrolytic reduction and continuing the electrolytic reduction of said precipitate from the trivalent to the di- valent state and effect the dissolution thereof.

319809

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