Method for removing metal and method for recovering metal

Abstract

Provided are a method for removing at least one metal that can effectively remove metals from lithium ion battery waste, and a method for recovering metals. A method for removing at least one metal from lithium ion battery waste, wherein the lithium ion battery waste has a cathode material with cathode-derived metals adhering onto a cathode current collector containing aluminum, the aluminum being a metal to be removed, wherein the method includes, in any order: a crushing step of crushing the lithium ion battery waste and separating at least a part of the cathode-derived metals from the cathode current collector; and an alkali separation step of separating at least a part of the cathode-derived metals from the cathode current collector by bring the lithium ion battery waste into contact with an alkaline solution to dissolve the aluminum, wherein the method further includes, after the crushing step, a sieving step of sieving the lithium ion battery waste into a material on sieve and a material under sieve containing the cathode-derived metals separated from the cathode current collector in the crushing step, and wherein, when the sieving step is performed before the alkali separation step, at least a part of the material on sieve obtained in the sieving step is subjected to the alkali separation step.

Dependencies are inferred from the claim text.