Caron ammonia process

An alternative route to cobalt/nickel separation following ammonia leaching in the Caron process is to produce a mixed Co/Ni carbonate product. This can then be dissolved in sulfate media and processed using one of the acidic extractants described later [13]. 

Caron (C9) developed an electrolytic method for separating cobalt and nickel from alloys of the two metals. The ammoniacal electrolyte composition is chosen to favor the plating of cobalt from nickel. The electrolyte is passed through a number of cells in series, with continuous deposition of cobalt at the cathode and the discharge of a cobalt-free high-nickel electrolyte. Distillation of this solution after the addition of Ca(OH)2 or NaOH converts the nickel to the hydroxide and the regenerated ammonia is returned to the process. 

Caron Process reduction roast - ammonia leach)... 

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