Title:
METHOD FOR EXTRACTING LITHIUM FROM BRINE BY USING POWDERED ADSORBENT
Document Type and Number:
WIPO Patent Application WO/2022/007660
Kind Code:
A1
Abstract:
Provided is a method for extracting lithium from brine by using a powdered adsorbent, which method comprises the following steps: a mixture of an adsorbent and brine being subjected to vacuum filtration in a brine separation zone to form a filter cake; the filter cake obtained from the brine separation zone being subjected to salt-leaching in a salt-leaching zone, so as to obtain high-salt low-lithium salt-leached water; and the filter cake obtained by means of salt-leaching in the salt-leaching zone being desorbed in a desorption zone to obtain a low-salt high-lithium desorption solution. The present invention greatly reduces the investment cost, and by means of the present invention, a desorption solution with a magnesium-to-lithium ratio of less than 1:1 and a salt-to-lithium ratio of less than 10:1 can be obtained, the investment and production costs of the subsequent salt removal and purification processes are substantially reduced, and finally battery-grade lithium carbonate or lithium hydroxide can be stably obtained. The new equipment proposed by the present invention can recover lithium ions lost during the salt washing process, such that a lithium ion recovery rate of at least 80% can be reached during the adsorption and desorption process of brine.
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Inventors:
LI YIRAN (CN)
SHEN FANGMING (CN)
MA JUNYAO (CN)
SHEN FANGMING (CN)
MA JUNYAO (CN)
Application Number:
PCT/CN2021/102991
Publication Date:
January 13, 2022
Filing Date:
June 29, 2021
Export Citation:
Assignee:
ZHEJIANG QUZHOU MINGDE NEW MAT CO LTD (CN)
International Classes:
C22B26/12; C22B3/24
Foreign References:
| CN111826531A | 2020-10-27 | |||
| CN213221252U | 2021-05-18 | |||
| CN213221207U | 2021-05-18 | |||
| CN111729350A | 2020-10-02 | |||
| CN109092242A | 2018-12-28 | |||
| CN209123481U | 2019-07-19 | |||
| CN106390960A | 2017-02-15 | |||
| CN106345394A | 2017-01-25 |
Other References:
ZHANG KAI, LI YI-RAN;MA JUN-YAO;HOU KAI: "Study on Lithium Extraction from Brine by Superconducting Magnetic Separation and Adsorption", NONFERROUS METALS (EXTRACTIVE METALLURGY), YEJIN GONGYE CHUBANSHE, BEIJING, CN, no. 3, 12 March 2020 (2020-03-12), Beijing, CN , pages 32 - 37, XP055886407, ISSN: 1007-7545
Attorney, Agent or Firm:
ZHEJIANG YONGDING LAW FIRM (CN)
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