Title:
RECOVERY METHOD FOR VALUABLE METALS IN WASTE NICKEL-COBALT-MANGANESE TERNARY LITHIUM BATTERIES
Document Type and Number:
WIPO Patent Application WO/2020/220559
Kind Code:
A1
Abstract:
A recovery method for valuable metals in waste nickel-cobalt-manganese ternary lithium batteries; the method comprises: removing impurities from Fe2+, Al3+, Ca2+ and Mg2+ before extraction so that the purity of valuable metal products recovered subsequently is high. During cobalt extraction, the oil-water ratio is controlled to be 0.8-0.9:1, and the saponification rate is controlled to be 55%-60%; by means of decreasing the saponification rate and appropriately decreasing the oil-water ratio, cobalt in a water phase is controlled to not be completely extracted, a small amount of cobalt being left in the water phase, thus guaranteeing that magnesium is not extracted out, and magnesium impurities in cobalt sulfate products are thereby guaranteed to reach a standard. A step of a magnesium extraction operation is added after cobalt extraction and before nickel extraction, residual magnesium is removed as much as possible, and the purity of nickel sulfate products obtained after nickel extraction is increased. A C272 extracting agent is used for magnesium extraction, the characteristic thereof whereby cobalt, magnesium and nickel extraction isothermal curves are separated widely is used, and only magnesium and cobalt being extracted while nickel is not extracted is controlled, therefore magnesium and nickel are separated.
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Inventors:
ZHAN WEN (CN)
ZHEN AIGANG (CN)
YU XINLIANG (CN)
ZHANG JINGWEI (CN)
LI BIN (CN)
CHEN JIAN (CN)
ZHAO HAIMIN (CN)
CHEN HONGJUAN (CN)
ZHEN AIGANG (CN)
YU XINLIANG (CN)
ZHANG JINGWEI (CN)
LI BIN (CN)
CHEN JIAN (CN)
ZHAO HAIMIN (CN)
CHEN HONGJUAN (CN)
Application Number:
PCT/CN2019/105497
Publication Date:
November 05, 2020
Filing Date:
September 12, 2019
Export Citation:
Assignee:
ZHEJIANG TIANNENG NEW MAT CO LTD (CN)
International Classes:
C22B3/38; C22B7/00; H01M10/54
Domestic Patent References:
| WO2016159001A1 | 2016-10-06 |
Foreign References:
| CN110066925A | 2019-07-30 | |||
| CN101509071A | 2009-08-19 | |||
| CN108517409A | 2018-09-11 |
Attorney, Agent or Firm:
HANGZHOU TIANQIN INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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