Title:
METHOD FOR EXTRACTING LITHIUM FROM WASTE LITHIUM BATTERY
Document Type and Number:
WIPO Patent Application WO/2023/029573
Kind Code:
A1
Abstract:
Disclosed in the present invention is a method for extracting lithium from a waste lithium battery, comprising the following steps: putting positive electrode powder of a waste lithium battery in hydrochloric acid for leaching; filtering to obtain a leachate; removing copper and iron from the leachate; introducing hydrogen sulfide gas for reaction; carrying out solid-liquid separation to obtain a first filter residue and a first filtrate; adding potassium permanganate into the first filtrate, and performing solid-liquid separation to obtain a second filter residue and a second filtrate; performing spray pyrolysis on the second filtrate to obtain solid particles; washing the solid particles with water to obtain a washing solution; collecting tail gas generated by spray pyrolysis after water spraying, and mixing same with the washing solution to obtain a lithium salt solution. In the present invention, the positive electrode powder is leached by hydrochloric acid to obtain a hydrochloric acid leachate, then copper and iron impurities in the leachate are sequentially removed, nickel cobalt is precipitated using hydrogen sulfide, potassium permanganate is added to precipitate manganese ions, aluminum magnesium in the solution is converted into an oxide by spray pyrolysis, and the lithium salt is separated out. The whole reaction process does not require an organic solvent extraction, thereby reducing the loss of lithium.
Inventors:
YU HAIJUN (CN)
XIE YINGHAO (CN)
LI AIXIA (CN)
ZHANG XUEMEI (CN)
LI CHANGDONG (CN)
XIE YINGHAO (CN)
LI AIXIA (CN)
ZHANG XUEMEI (CN)
LI CHANGDONG (CN)
Application Number:
PCT/CN2022/092490
Publication Date:
March 09, 2023
Filing Date:
May 12, 2022
Export Citation:
Assignee:
GUANGDONG BRUNP RECYCLING TECHNOLOGY CO LTD (CN)
HUNAN BRUNP RECYCLING TECH CO LTD (CN)
HUNAN BRUNP EV RECYCLING CO LTD (CN)
HUNAN BRUNP RECYCLING TECH CO LTD (CN)
HUNAN BRUNP EV RECYCLING CO LTD (CN)
International Classes:
C22B7/00; C22B26/12; H01M10/54
Domestic Patent References:
| WO2018047147A1 | 2018-03-15 | |||
| WO2012025568A2 | 2012-03-01 |
Foreign References:
| CN113846219A | 2021-12-28 | |||
| CN107046154A | 2017-08-15 | |||
| CN108011149A | 2018-05-08 | |||
| CN102665912A | 2012-09-12 | |||
| CN111534697A | 2020-08-14 | |||
| CN110923453A | 2020-03-27 |
Attorney, Agent or Firm:
JIAQUAN IP LAW (CN)
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