Title:
METHOD FOR RECOVERING LITHIUM FROM WASTE LITHIUM ION BATTERIES
Document Type and Number:
WIPO Patent Application WO/2023/195533
Kind Code:
A1
Abstract:
The present invention provides a method for recovering a valuable metal from waste lithium ion batteries, the method being capable of recovering lithium at a high recovery rate, and enabling recycling of resources. A method for recovering lithium from waste lithium ion batteries according to the present invention comprises: a dissolution step in which an active material powder that is obtained by subjecting the waste lithium ion batteries to a pretreatment is dissolved into a mineral acid so as to obtain a solution; a neutralization step in which the solution is neutralized with lithium hydroxide; a lithium hydroxide re-addition step in which lithium hydroxide is added again to the acid solution, to which lithium hydroxide has been added, and precipitates are filtered so as to obtain a first aqueous lithium salt solution as a filtrate; and a membrane electrolysis step in which the first aqueous lithium salt solution is subjected to membrane electrolysis using an ion exchange membrane so as to obtain an aqueous lithium hydroxide solution, an acid and a second aqueous lithium salt solution that is more dilute than the first aqueous lithium salt solution. The aqueous lithium hydroxide solution obtained in the membrane electrolysis step is reused in at least one step that is selected from the group consisting of the neutralization step and the lithium hydroxide re-addition step; and the acid obtained in the membrane electrolysis step is reused as the mineral acid that is used in the dissolution step.
Inventors:
YAMADA KEITA (JP)
SAKUMA YUKIO (JP)
HIRAOKA TARO (JP)
SAKUMA YUKIO (JP)
HIRAOKA TARO (JP)
Application Number:
PCT/JP2023/014342
Publication Date:
October 12, 2023
Filing Date:
April 07, 2023
Export Citation:
Assignee:
ASAKA RIKEN CO LTD (JP)
International Classes:
C22B7/00; C01D15/02; C01D15/08; C22B3/06; C22B3/08; C22B3/10; C22B3/22; C22B3/26; C22B3/28; C22B3/30; C22B3/38; C22B3/44; C22B23/00; C22B26/12; C22B47/00; C25B1/02; C25B1/26; C25B1/46; H01M10/54
Domestic Patent References:
| WO2021215521A1 | 2021-10-28 |
Foreign References:
| JP2001096236A | 2001-04-10 | |||
| JPH10287864A | 1998-10-27 | |||
| JP2015103320A | 2015-06-04 | |||
| JP2010277868A | 2010-12-09 | |||
| JP2011032151A | 2011-02-17 | |||
| JP7060899B1 | 2022-04-27 |
Attorney, Agent or Firm:
DELOITTE TOHMATSU IP FIRM (JP)
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