Title:
METHOD FOR SEPARATING COBALT AND NICKEL
Document Type and Number:
WIPO Patent Application WO/2023/190908
Kind Code:
A1
Abstract:
This method for separating cobalt and nickel comprises: a step (S3) for immersing an electrode material for a lithium-ion secondary battery in a processing liquid including sulfuric acid and hydrogen peroxide to obtain a leeching solution; a step (S4) for adding a hydrogen sulfide compound to the leeching solution to precipitate copper; one of a first processing step (S5A) or a second processing step (S5B); a step (S6) for obtaining a precipitate including cobalt sulfide and nickel sulfide, and a residual liquid including lithium; and a re-dissolving step (S7) for dissolving cobalt and nickel in a suspension in which the precipitate is suspended in distilled water or dilute sulfuric acid. In the re-dissolving step (S7), a fine-bubble generation apparatus is used to perform bubbling in the suspension, using oxidation gas including oxygen.
Inventors:
MIYAZAKI ATSUSHI (JP)
MURAOKA HIROKI (JP)
MURAOKA HIROKI (JP)
Application Number:
PCT/JP2023/013265
Publication Date:
October 05, 2023
Filing Date:
March 30, 2023
Export Citation:
Assignee:
MITSUBISHI MATERIALS CORP (JP)
International Classes:
C22B23/02; C22B1/02; C22B3/04; C22B3/08; C22B3/22; C22B3/44; C22B7/00; H01M10/54
Domestic Patent References:
| WO2022050248A1 | 2022-03-10 |
Foreign References:
| JP2017150027A | 2017-08-31 | |||
| JP2019173107A | 2019-10-10 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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