Method for removing aluminum

Abstract

A method for removing aluminum includes: a leaching step of leaching battery powder obtained from lithium ion battery waste, the battery powder containing at least aluminum and at least one of nickel and cobalt, with an acid to obtain a leached solution containing at least aluminum ions and at least one of nickel ions and cobalt ions; and a neutralization step including increasing a pH of the leached solution to remove aluminum ions, wherein, when removing the aluminum ions in the neutralization step, an alkaline pH adjusting agent is added to the leached solution to increase the pH, and when the pH reaches 3.0 to 4.0, iron is added in place of the pH adjusting agent to further increase the pH.

Dependencies are inferred from the claim text.