The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 16, 2025
Filed:
Jul. 14, 2022
Sumitomo Metal Mining Co., Ltd., Tokyo, JP;
Hirofumi Shouji, Niihama, JP;
Hiroshi Takenouchi, Niihama, JP;
Itsumi Matsuoka, Niihama, JP;
Shota Sanjo, Niihama, JP;
Takumi Matsugi, Niihama, JP;
Satoshi Asano, Niihama, JP;
Shin-Ichi Heguri, Niihama, JP;
SUMITOMO METAL MINING CO., LTD., Tokyo, JP;
Abstract
Provided is a method for obtaining a solution having a high concentration of nickel and/or cobalt from an alloy that contains copper as well as nickel and/or cobalt, in a waste lithium-ion battery. A method for treating an alloy comprises: a leaching step Sfor subjecting an alloy that contains copper as well as nickel and/or cobalt to a leaching treatment by using an acid solution in the presence of a sulfiding agent to obtain a leachate and a leaching residue; and a reduction step Sfor adding a reducing agent to a part of the obtained leachate and performing a reduction treatment to obtain a post-reduction solution and a reduction residue, wherein in the leaching step S, the leachate that has not been provided in the reduction treatment in the reduction step S, is repeatedly used as part or all of the acid solution added in the leaching treatment.