Method for producing mixed metal salt

Patent metadata

Field	Value
Publication number	US-2023312369-A1
Application number	US-202117918307-A
Country	US
Kind code	A1
Filing date	Apr 22, 2021
Priority date	Apr 23, 2020
Publication date	Oct 5, 2023
Grant date	—

Abstract

A method for producing mixed metal salts containing manganese ions and at least one of cobalt ions and nickel ions, the method including: an Al removal step of subjecting an acidic solution containing at least manganese ions and aluminum ions, and at least one of cobalt ions and nickel ions, to removal of the aluminum ions by extracting the aluminum ions into a solvent, the acidic solution being obtained by subjecting battery powder of lithium ion batteries to a leaching step; and a precipitation step of neutralizing an extracted residual liquid obtained in the Al removal step under conditions where a pH is less than 10.0, to precipitate mixed metal salts comprising a metal salt of manganese and a metal salt of at least one of cobalt and nickel.

First claim

1 . A method for producing mixed metal salts comprising manganese ions and at least one of cobalt ions and nickel ions, the method comprising:
an Al removal step of subjecting an acidic solution comprising at least manganese ions and aluminum ions, and at least one of cobalt ions and nickel ions, to removal of the aluminum ions by extracting the aluminum ions into a solvent, the acidic solution being obtained by subjecting battery powder of lithium ion batteries to a leaching step; and a precipitation step of neutralizing an extracted residual liquid obtained in the Al removal step under conditions where a pH is less than 10.0, to precipitate mixed metal salts comprising a metal salt of manganese and a metal salt of at least one of cobalt and nickel.

2 . The method for producing mixed metal salts according to claim 1 , wherein, in the precipitation step, sodium hydroxide is used for neutralization of the extracted residual liquid, and the mixed metal salts comprises a hydroxide of manganese and a hydroxide of at least one of cobalt hydroxide and nickel hydroxide.

3 . The method for producing mixed metal salts according to claim 1 or 2 ,
wherein the acidic solution further comprises one or more metal ions selected from the group consisting of magnesium ions, sodium ions, lithium ions and calcium ions, and
wherein, in the precipitation step, the metal ions are left in the liquid without precipitating the metal ions.

4 . The method for producing mixed metal salts according to any one of claims 1 to 3 , wherein, in the precipitation step, a pH of the extracted residual liquid is adjusted to 9.0 or more.

5 . The method for producing mixed metal salts according to any one of claims 1 to 4 , wherein, in the Al removal step, a solvent containing a carboxylic acid-based extracting agent is used to adjust an equilibrium pH to 4.0 to 5.0.

6 . The method for producing mixed metal salts according to any one of claims 1 to 5 , wherein, in the Al removal step, at least 80% or more of the manganese ions in the acidic solution and at least 80% or more of at least one of the cobalt ions and the nickel ions, on a mass basis, are left in an aqueous phase.

Assignees

• Jx Nippon Mining & Metals Corp

Inventors

• Arakawa Junichi
• Tajiri Kazunori

Classifications

• B09B3/35

  Shredding, crushing or cutting · CPC title

• C01G53/82

  Compounds containing nickel, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C01G53/40 Primary

  Complex oxides containing nickel and at least one other metal element · CPC title

• H01M10/54

  Reclaiming serviceable parts of waste accumulators · CPC title

• B01D11/0492 Primary

  Applications, solvents used · CPC title