US 12,319,979 B2
Method for recovering valuable metal
Nobuaki Okajima, Hitachi (JP); Kazunori Tajiri, Hitachi (JP); and Hiromichi Kashimura, Hitachi (JP)
Assigned to JX METALS CIRCULAR SOLUTIONS CO., LTD., Tokyo (JP)
Appl. No. 17/418,674
Filed by JX NIPPON MINING & METALS CORPORATION, Tokyo (JP)
PCT Filed Dec. 23, 2019, PCT No. PCT/JP2019/050411
§ 371(c)(1), (2) Date Jun. 25, 2021,
PCT Pub. No. WO2020/137997, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2018-246257 (JP), filed on Dec. 27, 2018.
Prior Publication US 2022/0127697 A1, Apr. 28, 2022
Int. Cl. C22B 3/00 (2006.01); C22B 7/00 (2006.01); C22B 26/12 (2006.01); H01M 10/54 (2006.01)
CPC C22B 23/0461 (2013.01) [C22B 7/007 (2013.01); C22B 23/0484 (2013.01); H01M 10/54 (2013.01); C22B 26/12 (2013.01); Y02W 30/84 (2015.05)] 9 Claims
OG exemplary drawing
 
1. A method for recovering a valuable metal, the method 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 comprising:
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 comprises: 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, and
wherein a phosphonate ester-based extracting agent is used as a first extracting agent in the first extraction step, and an extracting agent different from the first extracting agent is used as a second extracting agent in the second extraction step.