2[CoNH363 aq 3S042 aq [CoNH362S043s

The cobalt hexammine salt is then recrystallized to further remove any nickel contamination. After washing and filtration, the pure cobalt salt is redissolved in an ammonium sulfate solution.

Cobalt Recovery. Reduction of the cobalt (III) present in the pure cobaltic hexammine solution to cobalt (II) is completed in a step referred to as "conversion." The conversion of cobaltic hexammine to a cobaltous ammine is a disproportionation reaction, and it is accomplished by the controlled addition of metallic cobalt as defined by the following stoichiometry:

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