Jx Metals Circular Solutions Co., Ltd.

Jx Nippon Mining Metals Corporation

Jx Metals Corporation

Jx Advanced Metals Corporation

Hiromichi Kashimura

Nobuaki Okajima

Kazunori Tajiri

Junichi Arakawa

Eriko Kamiyama

A method for recovering at least cobalt of valuable metals, cobalt and nickel, from an acidic solution obtained by subjecting waste containing positive electrode materials for lithium ion secondary batteries to a wet process, the acidic solution comprising cobalt ions, nickel ions and impurities, the method including: a first extraction step for Co recovery, the first extraction step being for extracting cobalt ions by solvent extraction from the acidic solution and stripping the cobalt ions; and a second extraction step for Co recovery, the second extraction step being for extracting cobalt ions by solvent extraction from a stripped solution obtained in the first extraction step for Co recovery and stripping the cobalt ions, wherein the first extraction step for Co recovery includes: a solvent extraction process for extracting cobalt ions in the acidic solution into a solvent; a scrubbing process for scrubbing the solvent that has extracted the cobalt ions; and a stripping process for stripping the cobalt ions in the solvent after the scrubbing into a solution.

Method for recovering valuable metal

A method for recovering at least cobalt of valuable metals, cobalt and nickel, from an acidic solution obtained by subjecting waste containing positive electrode materials for lithium ion secondary batteries to a wet process, the acidic solution comprising cobalt ions, nickel ions and impurities, wherein the method includes: a first extraction step for Co recovery, the first extraction step being for extracting cobalt ions by solvent extraction from the acidic solution and stripping the cobalt ions; an electrolytic step for Co recovery, the electrolytic step being for providing electrolytic cobalt by electrolysis using a stripped solution obtained in the first extraction step for Co recovery as an electrolytic solution; a dissolution step for Co recovery, the dissolution step being for dissolving the electrolytic cobalt in an acid; and a second extraction step for Co recovery, the second extraction step being for extracting cobalt ions by solvent extraction from a cobalt dissolved solution obtained in the dissolution step for Co recovery and stripping the cobalt ions.

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Hitachi, Japan

Hiromichi Kashimura