Title:
EXTRACTION SYSTEM AND METHOD FOR SEPARATING MAGNESIUM AND EXTRACTING LITHIUM FROM MAGNESIUM CONTAINING BRINE USING SECONDARY AMIDE/TERTIARY AMIDE COMPLEX SOLVENT, AND APPLICATION OF EXTRACTION METHOD
Document Type and Number:
WIPO Patent Application WO/2021/088287
Kind Code:
A1
Abstract:
An extraction system and method for separating magnesium and extracting lithium from magnesium containing brine using a secondary amide/tertiary amide complex solvent and application of the extraction method. The extraction system contains secondary amide and tertiary amide, and each of the secondary amide and the tertiary amide consists of a single compound or a mixture of two or more compounds. The total number of carbon atoms in a molecule is 12-18 and 18-32, and the freezing point of the extraction system is lower than 0℃. Single-stage or multi-stage counter-current extraction is carried out under the condition that the volume ratio of an organic phase to a brine phase is (1-10):1, the density of the brine is 1.25-1.38 g/cm3, and the temperature is 0-50℃; an aqueous phase low in magnesium-lithium ratio is obtained by means of back extraction, and lithium chloride, lithium carbonate, and lithium hydroxide products are respectively obtained by means of concentration, purification, and preparation. The present invention has the excellent effects that a secondary amide extraction agent is simple in molecular structure and easy to produce, and physical properties such as viscosity of the complex solvent are improved by means of the tertiary amide; the multi-stage extraction rate of Li+ is high, the magnesium-lithium separation coefficient is large, water is used for back extraction, and acid-base consumption is greatly reduced; the extraction separation technological process is short, and the extraction system is small in dissolution loss.
Inventors:
YANG LIXIN (CN)
LIU CHANG (CN)
LI CONG (CN)
LI ZHIQIANG (CN)
PENG RUJUN (CN)
LI HAIBO (CN)
LIU CHANG (CN)
LI CONG (CN)
LI ZHIQIANG (CN)
PENG RUJUN (CN)
LI HAIBO (CN)
Application Number:
PCT/CN2020/079077
Publication Date:
May 14, 2021
Filing Date:
March 13, 2020
Export Citation:
Assignee:
UNIV XIANGTAN (CN)
International Classes:
C22B3/32; C22B26/12; C22B26/22; C01D15/02; C01D15/04; C01D15/08; C25B1/34
Foreign References:
| CN110643833A | 2020-01-03 | |||
| CN110777267A | 2020-02-11 | |||
| CN106319244A | 2017-01-11 | |||
| CN107447108A | 2017-12-08 | |||
| US20160207793A1 | 2016-07-21 | |||
| US20170306439A1 | 2017-10-26 | |||
| CA2384631A1 | 2001-04-05 |
Attorney, Agent or Firm:
XIANGTAN HUIZHI PATENT FIRM (GENERAL PARTNERSHIP) (CN)
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