Method for producing high purity cobalt sulfate solution and method for producing cobalt sulfate

摘要

Problem to be solved: to provide a method of producing a high purity cobalt sulfate solution capable of effectively enhancing the purity of cobalt in a cobalt sulfate solution containing a relatively small amount of nickel ions and a method of producing cobalt sulfate.Cobalt sulfate solution containing nickel ionsA method of producing a high purity cobalt sulfate solution having a high purity of cobalt in comparison with said cobalt sulfate solutionThe cobalt / nickel concentration ratio of the cobalt sulfate solution is 100 or more.Cobalt sulfate solutionBis (2)4The pH is adjusted by contacting the solvent containing 4-trimethylpentyl phosphine.After extraction of cobalt ions into the solvent while leaving nickel ions in the cobalt sulfate solution in solution,The method includes a nickel separation step for extracting the cobalt ions extracted in the solvent by sulfuric acid.Diagram