Title:
METHOD FOR EXTRACTING LITHIUM FROM LITHIUM-CONTAINING LOW-MAGNESIUM BRINE
Document Type and Number:
WIPO Patent Application WO/2021/143809
Kind Code:
A1
Abstract:
Disclosed is a method for extracting lithium from lithium-containing low-magnesium brine, relating to the technical field of chemistry and chemical engineering. The method comprises the following steps: mixing CaO, water and excess Na2CO3 for a reaction, and filtering a resulting reaction liquid to obtain a basic solution and a CaCO3 solid; adding the basic solution into lithium-containing low-magnesium brine, gradually adjusting the pH of the lithium-containing low-magnesium brine to 11 or more, and precipitating basic magnesium carbonate and a Mg(OH)2 precipitate to obtain a lithium-containing brine from which magnesium is removed; carrying out extraction on the lithium-containing brine from which magnesium is removed by using a complex organic extraction system, to obtain a loaded organic phase and an extraction raffinate; and mixing the loaded organic phase with an acid aqueous solution, and reverse extracting lithium in the loaded organic phase to obtain a lithium-containing aqueous solution and a lithium-removed organic phase. By means of the method, lithium can be extracted from lithium-containing low-magnesium brine, and the yield of lithium is high, the purity is high, and the cost is low, and same requires a small investment and has a high material cyclic utilization rate.
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Inventors:
LIU LIHUI (CN)
LIN JIAJING (CN)
ZHANG RUGE (CN)
LIN JIAJING (CN)
ZHANG RUGE (CN)
Application Number:
PCT/CN2021/072040
Publication Date:
July 22, 2021
Filing Date:
January 15, 2021
Export Citation:
Assignee:
YIDING SHANGHAI INFORMATION TECH CO LTD (CN)
International Classes:
C22B3/44; C22B3/26; C22B26/12
Foreign References:
| CN111139356A | 2020-05-12 | |||
| CN108004420A | 2018-05-08 | |||
| CN110656239A | 2020-01-07 | |||
| CN107779612A | 2018-03-09 | |||
| CN104583128A | 2015-04-29 | |||
| CN110643833A | 2020-01-03 | |||
| JP4581553B2 | 2010-11-17 | |||
| JP2019011518A | 2019-01-24 |
Attorney, Agent or Firm:
BEIJING GAOWO LAW FIRM (CN)
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