Title:
METHOD FOR RECOVERING LITHIUM FROM LITHIUM-CONTAINING WASTEWATER
Document Type and Number:
WIPO Patent Application WO/2022/022608
Kind Code:
A1
Abstract:
The present invention belongs to the field of hydrometallurgy. Disclosed is a method for recovering lithium from lithium-containing wastewater. The method comprises the following steps: (1) adjusting the pH of lithium-containing wastewater to be acidic or neutral; and (2) first formulating an organic phase, then saponifying same, adding the lithium-containing wastewater for extraction, and then separating the aqueous phase to obtain a loaded organic phase containing lithium ions, wherein a solution for adjusting the pH of the lithium-containing wastewater is sulfuric acid, and the organic phase comprises the following components: an extractant, a synergist and a diluent. In the combined extractant system of the present invention, ferric trichloride does not need to be added as a co-extraction agent, so that the phenomenon of emulsification caused by Fe3+ hydrolysis is avoided. The combined extractant system of the present invention has a good selectivity for lithium and sodium and a high loading amount; and after 4-stage countercurrent extraction, Li in the wastewater can be reduced from 3.7g/L to 0.126g/L, and the extraction rate can reach 96.6%.
Inventors:
ZHANG RONGRONG (CN)
LI SHENGKANG (CN)
LIU HUANGHUA (CN)
LIU YONGQI (CN)
GONG QINXUE (CN)
LI CHANGDONG (CN)
LI SHENGKANG (CN)
LIU HUANGHUA (CN)
LIU YONGQI (CN)
GONG QINXUE (CN)
LI CHANGDONG (CN)
Application Number:
PCT/CN2021/109113
Publication Date:
February 03, 2022
Filing Date:
July 29, 2021
Export Citation:
Assignee:
HUNAN BRUNP RECYCLING TECH CO LTD (CN)
GUANGDONG BRUNP RECYCLING TECHNOLOGY CO LTD (CN)
HUNAN BRUNP VEHICLES RECYCLING CO LTD (CN)
GUANGDONG BRUNP RECYCLING TECHNOLOGY CO LTD (CN)
HUNAN BRUNP VEHICLES RECYCLING CO LTD (CN)
International Classes:
C22B3/38; C22B26/12; C22B7/00
Foreign References:
| CN111945017A | 2020-11-17 | |||
| CN109852797A | 2019-06-07 | |||
| CN107058742A | 2017-08-18 | |||
| CN108611497A | 2018-10-02 | |||
| CN109088116A | 2018-12-25 | |||
| US3537813A | 1970-11-03 | |||
| CN108866352A | 2018-11-23 |
Other References:
HANO T., JIANG ZHIMEI: "Recovery of Lithium From Geothermal Water with Solvent Extraction Techniques", no. 2, 2 July 1993 (1993-07-02), pages 57 - 62, XP055891725, ISSN: 1009-2617, DOI: 10.13355/j.cnki.sfyj.1993.02.011
Attorney, Agent or Firm:
ADVANCE CHINA IP LAW OFFICE (CN)
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