METHOD FOR MANUFACTURING COBALT SOLUTION HAVING LOW MANGANESE CONCENTRATION

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a cobalt solution having a low manganese concentration by which manganese is industrially advantageously removed from a cobalt solution containing manganese as an impurity by an oxidation neutralization method and a direct recovery rate of cobalt can be increased.

SOLUTION: The method for manufacturing a cobalt solution having a low manganese concentration includes a first step in which a cobalt solution is subjected to an oxidation neutralization reaction by setting conditions where the oxidation-reduction potential of the solution becomes≥900 mV (on the basis of Ag/AgCl electrodes) and the pH of the solution becomes≤3 to remove most of manganese as the precipitate of an oxide having a Co to Mn weight ratio of 0.3-1.0 and a second step in which the oxidation neutralization reaction is continued while keeping the resulting cobalt solution under the above conditions to remove a small amount of remaining manganese as the precipitate of an oxide, thereby obtaining a high purity cobalt solution having a manganese concentration of≤0.05 g/L.

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