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Abstract

A method for reducing usage amount of expensive high alkaline neutralizer, and applying efficient neutralization treatment, when applying a neutralization treatment to a barren solution to produce in a treatment step, in which a sulfide compose of nickel and cobalt is produced from a sulfuric acid aqueous solution containing nickel and cobalt, and impurity metals containing at least one or more of iron, magnesium, and manganese. A first neutralization treatment step of applying a neutralization treatment to the barren solution, with a range of pH 5.0 to 6.0 as the end point, by using calcium carbonate slurry, as a first neutralizer; and a second neutralization treatment step of applying a neutralization treatment to a solution produced in the first neutralization treatment step, by using a second neutralizer, to produce sediment containing metal remained in the barren solution and a post-neutralization solution from which a metal ion is removed.

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