Sumitomo Metal Mining Company, Ltd.

Shota Sanjo

Satoshi Asano

Keiji Kudou

Shin-Ichi Heguri

Hiroshi Kobayashi

Hideki Ohara

Shin-ichi Heguri

Masatoshi Takano

Itsumi Matsuoka

Hirofumi Shouji

Hiroshi Takenouchi

Yusuke Senba

Hiroto Watanabe

Takumi Matsugi

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.

Method for treating alloy

A method of manufacturing a cobalt-nickel-containing solution including: preparing a crude nickel hydroxide and/or a crude cobalt hydroxide as a starting material, the crude nickel or cobalt hydroxide containing cobalt and nickel and elements except the cobalt and nickel as impurities, the crude nickel hydroxide containing the nickel more than the cobalt, and the crude cobalt hydroxide containing the cobalt more than the nickel; a water-washing process for obtaining a post-water-washing crude hydroxide from the starting material; a leaching process for obtaining a post-leaching solution from the post-water-washing crude hydroxide; a neutralization process of subjecting the post-leaching solution to neutralization and solid-liquid-separation to remove the impurities as a post-neutralization residue containing one or more of iron, silicon, aluminum, and chromium, thereby obtaining a post-neutralization solution; and an extraction process of subjecting the post-neutralization solution to solvent extraction to obtain a post-extraction solution containing cobalt and nickel with the impurities reduced.

Method for manufacturing nickel and cobalt-containing solution from hydroxide containing nickel and cobalt

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Niihama, Japan

Shota Sanjo