Method for removing aluminum and method for recovering metals

Abstract

Provided are a method for removing aluminum which can effectively remove aluminum, and a method for recovering metals. A method for removing aluminum includes: a leaching step of bringing a raw material, the raw material having battery powder, the battery powder being obtained from lithium ion battery waste and comprising at least aluminum and nickel and/or cobalt, into contact with an acidic leaching solution to leach the battery powder to obtain a leached solution containing at least aluminum ions and nickel ions and/or cobalt ions; and a neutralization step of using the leached solution as a metal-containing solution, increasing a pH of the metal-containing solution and separating a neutralized residue to obtain a neutralized solution, wherein a molar ratio of fluorine to aluminum (F/Al molar ratio) of the raw material is 1.3 or more, and wherein, in the neutralization step, the metal-containing solution contains calcium and fluorine, a molar ratio of calcium to aluminum ions (Ca/Al molar ratio) in the metal-containing solution is 0.2 or more, the aluminum ions in the metal-containing solution are precipitated and contained in the neutralized residue together with calcium and fluorine.

Dependencies are inferred from the claim text.