Title:
METHOD FOR RECOVERING LITHIUM AND METHOD FOR PRODUCING LITHIUM CARBONATE
Document Type and Number:
WIPO Patent Application WO/2022/085222
Kind Code:
A1
Abstract:
A method for recovering lithium, wherein after obtaining a molten metal that contains a valuable metal and a molten slag that contains at least aluminum and lithium by melting a lithium ion secondary battery to be discarded, lithium is recovered from the slag that contains at least aluminum and lithium, said slag having been separated from the molten metal that contains a valuable metal. With respect to this method for recovering lithium, the melting conditions of the lithium ion secondary battery are adjusted so that the mass ratio of aluminum to lithium contained in the slag, namely the value of aluminum/lithium is 6 or less; a leachate, into which lithium contained in the slag has leached, is obtained by bringing the slag and an aqueous liquid into contact with each other; and a purified solution, in which lithium is dissolved, is obtained by means of solid-liquid separation by bringing the leachate and a basic substance into contact with each other, thereby having unwanted metals contained in the leachate precipitate in the form of a poorly soluble substance.
Inventors:
ABE TAKURO (JP)
HOSODA NAOKI (JP)
KATAYAMA SHINSUKE (JP)
ASANO SATOSHI (JP)
NAGAKURA TOSHIHIKO (JP)
HOSODA NAOKI (JP)
KATAYAMA SHINSUKE (JP)
ASANO SATOSHI (JP)
NAGAKURA TOSHIHIKO (JP)
Application Number:
PCT/JP2021/015245
Publication Date:
April 28, 2022
Filing Date:
April 13, 2021
Export Citation:
Assignee:
KANTO DENKA KOGYO KK (JP)
SUMITOMO METAL MINING CO (JP)
SUMITOMO METAL MINING CO (JP)
International Classes:
C22B7/00; C22B3/06; C22B3/44; C22B7/04; C22B26/12
Foreign References:
| JP2020029613A | 2020-02-27 | |||
| JP2019175546A | 2019-10-10 | |||
| JPH11242967A | 1999-09-07 | |||
| JP2019160429A | 2019-09-19 | |||
| JP2019173106A | 2019-10-10 | |||
| JP2002029613A | 2002-01-29 |
Attorney, Agent or Firm:
SHOWA INTERNATIONAL PATENT FIRM (JP)
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