Title:
VALUABLE METAL RECOVERY METHOD
Document Type and Number:
WIPO Patent Application WO/2020/137997
Kind Code:
A1
Abstract:
Provided is a method for recovering at least cobalt from among the valuable metals cobalt and nickel from an acid solution containing cobalt ions, nickel ions and impurities, obtained by subjecting waste containing positive electrode material of lithium-ion rechargeable batteries to a wet process. The method comprises a first extraction step for recovering Co reverse-extracted when extracting cobalt ions by solvent extraction from the acid solution; and a second extraction step for recovering cobalt, in which cobalt ions are reverse extracted and extracted by solvent extraction from the post-reverse extraction liquid obtained in the first extraction step for cobalt recovery. The first extraction step for recovering Co has a solvent extraction process in which cobalt ions in the acid solution are extracted in a solvent; a scrubbing process in which the solvent used to extract the cobalt ions is scrubbed; and a reverse extraction process in which cobalt ions in the solvent after scrubbing are reverse extracted into solution.
Inventors:
OKAJIMA NOBUAKI (JP)
TAJIRI KAZUNORI (JP)
KASHIMURA HIROMICHI (JP)
TAJIRI KAZUNORI (JP)
KASHIMURA HIROMICHI (JP)
Application Number:
PCT/JP2019/050411
Publication Date:
July 02, 2020
Filing Date:
December 23, 2019
Export Citation:
Assignee:
JX NIPPON MINING & METALS CORP (JP)
International Classes:
C22B23/00; B09B3/00; C22B3/26; C22B7/00; H01M10/54
Domestic Patent References:
| WO2018181816A1 | 2018-10-04 |
Foreign References:
| JP2009193778A | 2009-08-27 | |||
| JP2015183292A | 2015-10-22 | |||
| JP2013007107A | 2013-01-10 | |||
| JP2010180439A | 2010-08-19 | |||
| US20110135547A1 | 2011-06-09 | |||
| JP5706457B2 | 2015-04-22 |
Other References:
See also references of EP 3904547A4
Attorney, Agent or Firm:
AXIS PATENT INTERNATIONAL (JP)
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