METHOD FOR SEPARATING COBALT AND NICKEL

WIPO Patent Application WO/2022/050248

A1

This method comprises: a heat treatment step (S1) wherein a heat treatment is carried out by heating a lithium ion secondary battery; a grinding and sorting step (S2) wherein the lithium ion secondary battery after the heat treatment is ground and sorted, thereby obtaining an electrode material that contains at least cobalt, nickel, copper and lithium; a leaching step (S3) wherein the electrode material is immersed in a treatment solution that contains sulfuric acid and hydrogen peroxide, thereby obtaining a leachate; a copper separation step (S4) wherein a hydrogen sulfide compound is added to the leachate, and the resulting solution is stirred and subsequently subjected to solid-liquid separation, thereby obtaining an elution solution that contains cobalt and nickel, and a residue that contains copper sulfide; and a cobalt·nickel separation step (S5) wherein after adjusting the pH of the elution solution by adding an alkali metal hydroxide thereto, a hydrogen sulfide compound is added thereto and the resulting solution is stirred and subsequently subjected to solid-liquid separation, thereby obtaining a sediment that contains cobalt sulfide and nickel sulfide, and a residual liquid that contains lithium.

MIYAZAKI ATSUSHI (JP)
MURAOKA HIROKI (JP)

PCT/JP2021/031833

March 10, 2022

August 31, 2021

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MITSUBISHI MATERIALS CORP (JP)

C22B3/08; C22B23/00; C22B3/44

JP2015183292A	2015-10-22
JP2017036489A	2017-02-16
JP2016186118A	2016-10-27
JP2011074406A	2011-04-14
JP2017036490A	2017-02-16
JP2019108586A	2019-07-04
JP2020522622A	2020-07-30
JP2020148388A	2020-09-17
JP2021138132A	2021-09-16
JP2016113672A	2016-06-23
JP2016186118A	2016-10-27

MATSUNUMA Yasushi et al. (JP)

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