Purification of nickel electrolyte

Details Purification of nickel electrolyte Purification of nickel electrolyte

C - Chemistry, Metallurgy

25

C

204/71, 204/80

C25C 1/08 (2006.01) C25C 1/18 (2006.01)

Patent

CA 1197490

14 ABSTRACT An electrolytic process for purifying a nickel-containing solution as provided comprising forming an electrolytic system comprised of at least one electrolytic cell containing at least one anode, at least one cathode, and an aqueous electrolyte, said electrolyte being substantially copper-free and containing in solution nickel, an alkali metal, and chloride ions and at least one of said impurities, the improvement comprising: establishing in the electrolytic cell an anode compartment and cathode compartment separated by a chlorine-resistant diaphragm through which electrolytic contact is established between the anode and cathode compartments; flowing the electrolyte through the anode compartment; maintaining a non-circulating catholyte in the cathode compartment, said catholyte being an aqueous solution containing sufficient hydroxyl ions such that under operating conditions nickel ions are prevented from migrating to the cathode compartment and substantially only the decomposition ofwater and evolution of hydrogen occurs in the cathode compartment impressing an electrical current in the cell to generate chlorine at the anode, said chlorine in the aqueous electrolyte reacting with at least one impurity present in the electrolyte to provide a precipitate containing the impurity; and separating theprecipitate from the electrolyte. The process can be used to recover cobalt with reduced power consumption from a nickel refining electrolyte.

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