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Abstract

This method for separating cobalt and nickel includes a step (S3) of immersing an electrode material of a lithium ion secondary battery in a treatment liquid containing sulfuric acid and hydrogen peroxide to obtain a leachate, a step (S4) of adding a hydrogen sulfide compound to the leachate to precipitate copper, either one of a first treatment step (S5A) or a second treatment step (S5B), a step (S6) of obtaining a precipitate substance containing cobalt sulfide and nickel sulfide and a residual liquid containing lithium, and a re-dissolution step (S7) of dissolving cobalt and nickel in a suspension obtained by suspending the precipitate substance in distilled water or dilute sulfuric acid, in which, in the re-dissolution step (S7), the suspension is bubbled with an oxidizing gas containing oxygen using a fine-bubble generation apparatus.

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First Claim