METHOD FOR RECOVERING VALUABLE METALS FROM WASTE LITHIUM-ION BATTERY

WIPO Patent Application WO/2024/040910

A1

Disclosed is a method for recovering valuable metals from a waste lithium-ion battery. The method comprises the following steps: S1: discharging the waste lithium-ion battery in a discharge solution containing sulfate, then mixing with sulfate and/or sulfide and carrying out pyrolysis roasting, spraying a solution containing sulfate during the pyrolysis roasting process, and recovering a black battery powder; and S2: leaching metal ions in the battery black powder by using a solvent, and extracting and precipitating lithium to obtain lithium carbonate and nickel cobalt manganese sulfate. The method of the present invention uses the sulfate solution to perform discharge treatment on the waste lithium-ion battery, which may promote the sulfation of valuable metals in the waste lithium-ion battery, and improve the pyrolysis roasting effect. In the method of the present invention, control of the pyrolysis roasting temperature is implemented by means of the solution containing sulfate being sprayed during the pyrolysis roasting process, thereby avoiding the generation of a large amount of metal alloys and impurities caused by the pyrolysis roasting temperature being excessively high.

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ZHOU QI (CN)
ZHENG YU (CN)
SHI QUANQING (CN)
LIU YONGQI (CN)
GONG QINXUE (CN)
LI CHANGDONG (CN)

PCT/CN2023/079351

February 29, 2024

March 02, 2023

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GUANGDONG BRUNP RECYCLING TECHNOLOGY CO LTD (CN)
HUNAN BRUNP RECYCLING TECH CO LTD (CN)

C22B7/00; B01D53/58; B01D53/78; C22B1/06; C22B3/38; C22B23/00; C22B23/02; C22B26/12; C22B47/00; H01M10/54

CN115466845A	2022-12-13
CN109935922A	2019-06-25
CN108767354A	2018-11-06
KR20220101972A	2022-07-19
CN111206148A	2020-05-29
CN114293029A	2022-04-08

JIAQUAN IP LAW (CN)

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