ALLOY PROCESSING METHOD

WIPO Patent Application WO/2023/033023

A1

Provided is a method for effectively obtaining a solution containing nickel and/or cobalt from an alloy that contains copper as well as nickel and/or cobalt, in a waste lithium-ion battery or the like.　The present invention is an alloy processing method for obtaining a solution containing nickel and/or cobalt from an alloy that contains copper as well as nickel and/or cobalt, said method including a leaching step for carrying out an acid solution leaching treatment on an alloy-containing slurry in the presence of a sulfurising agent to obtain a leachate and a leaching residue. In the leaching step, the leaching treatment is carried out with the initial concentration of the alloy-containing slurry adjusted to between 100 g/L and 250 g/L. Moreover, in the leaching step, the leaching treatment is preferably carried out while controlling the redox potential (using a silver/silver chloride electrode as a reference electrode) to 200 mV or less. Furthermore, in the leaching step, the leaching treatment is preferably carried out in the presence of the sulfurising agent in an amount in the range of 1.05 to 1.25 equivalent weight (S-mol/Cu-mol) in relation to the amount of copper contained in the alloy.

SHOUJI HIROFUMI (JP)
TAKENOUCHI HIROSHI (JP)
MATSUOKA ITSUMI (JP)
SANJO SHOTA (JP)
MATSUGI TAKUMI (JP)
HEGURI SHIN-ICHI (JP)
ASANO SATOSHI (JP)

PCT/JP2022/032711

March 09, 2023

August 31, 2022

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SUMITOMO METAL MINING CO (JP)

C22B23/00; C22B3/06; C22B3/44; C22B7/00

JP2019077912A	2019-05-23
JP2015183292A	2015-10-22
JP2012153956A	2012-08-16
JP2019077913A	2019-05-23
JP2019169308A	2019-10-03
JP2020029586A	2020-02-27
JP2012172169A	2012-09-10

SHOBAYASHI Masayuki et al. (JP)

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