METHOD FOR RECOVERING COBALT FROM AQUEOUS CHLORIDE SOLUTION

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PROBLEM TO BE SOLVED : To provide a method for recovering a cobalt from aqueous chloride solution containing the cobalt and alkaline-earth metal, wherein the load in a facility cost is low and an agent cost is low. SOLUTION : The method for recovering the cobalt from the aqueous chloride solution containing the cobalt and the alkaline-earth metal comprises the following (1) and (2) processes. (1) In the aqueous chloride solution, the PH is adjusted to 7.5-9.0 by adding a neutralizing agent to form slurry composed of a sediment containing the cobalt. (2) In the slurry, the PH is adjusted to 6.0-7.0 by adding the neutralizing agent while adjusting an oxidation-reduction potential (Ag/AgCl electrode criteria) to ≥450 mV by adding an oxidant, to recover cobalt hydrate (III) deposits. COPYRIGHT : (C)2010, JPO&INPIT