Title:
METHOD FOR RECOVERING LITHIUM FROM WASTE LITHIUM ION BATTERIES
Document Type and Number:
WIPO Patent Application WO/2023/229045
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a method which is for recovering lithium from waste lithium ion batteries, and which enables recovering of lithium at a high recovery rate. This method for recovering lithium from waste lithium ion batteries comprises: a dissolution step for dissolving, by means of a mineral acid, active material powder which is obtained by pretreating the waste lithium ion batteries; a neutralization step for adding, to a solution obtained in the dissolution step, at least one selected from the group consisting of sodium hydroxide and potassium hydroxide; a solvent extraction step for separating, from the solution obtained in the neutralization step, at least one kind of a metal other than lithium through organic solvent extraction, to thereby obtain an alkaline mixed salt aqueous solution; a separation step for separating, from the alkaline mixed salt aqueous solution, a lithium salt, and a salt of at least one selected from the group consisting of sodium and potassium; and a lithium recovery step for recovering lithium from a first lithium salt aqueous solution obtained in the separation step.
Inventors:
YAMADA KEITA (JP)
SAKUMA YUKIO (JP)
HIRAOKA TARO (JP)
SAKUMA YUKIO (JP)
HIRAOKA TARO (JP)
Application Number:
PCT/JP2023/019813
Publication Date:
November 30, 2023
Filing Date:
May 26, 2023
Export Citation:
Assignee:
ASAKA RIKEN CO LTD (JP)
International Classes:
C22B26/12; C22B3/06; C22B3/08; C22B3/10; C22B3/20; C22B3/22; C22B3/26; C22B3/28; C22B3/30; C22B3/38; C22B3/44; C22B7/00; C22B21/00; C22B23/00; C22B47/00; C25B1/04; C25B1/16; C25B1/26; C25B1/46; H01M10/54
Foreign References:
| JP2019173106A | 2019-10-10 | |||
| JP2020072032A | 2020-05-07 | |||
| JP7084669B1 | 2022-06-15 | |||
| JP7097130B1 | 2022-07-07 |
Attorney, Agent or Firm:
DELOITTE TOHMATSU IP FIRM (JP)
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