Method for extracting lithium salt from lithium brine

A technology for extracting lithium and brine, which is applied in the direction of lithium carbonate;/acid carbonate, lithium halide, etc., can solve the problems of high cost and inability to industrialize, so as to improve utilization rate, avoid hydrolysis, and reduce production cost Effect

Inactive Publication Date: 2013-03-27
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem in the prior art that the cost of extracting lithium salt from lithium-containing brine is too high to be in...

Method used

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  • Method for extracting lithium salt from lithium brine
  • Method for extracting lithium salt from lithium brine
  • Method for extracting lithium salt from lithium brine

Examples

Experimental program
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Effect test

specific Embodiment 1

[0048] Add 1 part of a certain salt lake lithium-containing brine (Mg / Li=1~1630 molar ratio, hydrogen ion concentration=0.01~0.10 molar concentration) into a separating funnel, add a certain amount of FeCl 3 (concentration in brine to 0.05-3.0mol / L) as a co-extraction agent, shake to dissolve. Add 1-3 parts of extractant (compared to O / A=1-3), the content of tributyl phosphate extractant in the organic phase is 40-100% (V%), and shake for less than 10 minutes to extract. After the oscillation is over, the static stratification and phase separation. The extraction rate of Li can be greater than 97% through multi-stage countercurrent extraction or fractional distillation extraction process. The extracted lithium-containing organic phase LiFeCl 4 2TBP add dilute hydrochloric acid (H + Concentration=0.05~2.0mol / L)) to remove some impurities entrained. After washing, the organic phase LiFeCl 4 2TBP was added concentrated hydrochloric acid (H + Concentration=2~10 mole mol / L) s...

specific Embodiment 2

[0051] Add 1 part of a certain salt lake lithium-containing brine (Mg / Li=1~1630 molar ratio, hydrogen ion concentration=0.01~0.10 molar concentration) into a separating funnel, add a certain amount of FeCl 3 (concentration in brine to 0.05-3.0mol / L) as a co-extraction agent, shake to dissolve. Add 1-3 parts of extractant (compared to O / A=1-3), the content of tributyl phosphate extractant in the organic phase is 40-100% (V%), and shake for less than 10 minutes to extract. After the oscillation is over, the static stratification and phase separation. The extraction rate of Li can be greater than 97% through multi-stage countercurrent extraction or fractional distillation extraction process. The extracted lithium-containing organic phase LiFeCl 4 2TBP add dilute hydrochloric acid (H + Concentration=0.05~2.0mol / L)) to remove some impurities entrained. After washing, the organic phase LiFeCl 4 2TBP was added concentrated hydrochloric acid (H + Concentration=2~10 mole mol / L) s...

specific Embodiment 3

[0054] Add 1 part of a certain salt lake lithium-containing brine (Mg / Li=1~1630 molar ratio, hydrogen ion concentration=0.01~0.10 molar concentration) into a separating funnel, add a certain amount of FeCl 3(concentration in brine to 0.05-3.0mol / L) as a co-extraction agent, shake to dissolve. Add 1-3 parts of extractant (compared to O / A=1-3), the content of tributyl phosphate extractant in the organic phase is 40-100% (V%), and shake for less than 10 minutes to extract. After the oscillation is over, the static stratification and phase separation. The extraction rate of Li can be greater than 97% through multi-stage countercurrent extraction or fractional distillation extraction process. The extracted lithium-containing organic phase LiFeCl 4 2TBP add dilute hydrochloric acid (H + Concentration=0.05~2.0mol / L)) to remove some impurities entrained. After washing, the organic phase LiFeCl 4 2TBP was added concentrated hydrochloric acid (H + Concentration=2~10 mole mol / L) so...

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Abstract

The invention provides a method for extracting lithium salt from lithium brine. The method comprises the following steps: extraction step: adding a co-extracting agent FeCl3 and an extraction agent tributyl phosphate (TBP) to lithium brine to extract lithium so as to obtain an organic phase LiFeCl4.2TBP and a water phase raffinate; reverse extraction step: adding a hydrochloric acid liquor to the organic phase LiFeCl4.2TBP for reverse extraction to obtain organic phase LiFeCl4.2TBP and water phase LiCl; and phase inversion step: inversing phase for the organic phase LiFeCl4.2TBP containing hydrogen ions by a liquor of alkali chloride, alkaline earth chloride or a mixture MCln (n is greater than or equal to 1) as a phase inversion agent to obtain an organic phase M(FeCl4)n.2TBP. According to the method for extracting lithium salt from lithium brine provided by the invention, the production cost of extracting lithium salt can be lowered.

Description

technical field [0001] The invention relates to the technical fields of extraction chemistry and chemical industry, in particular to a method for extracting lithium salt from lithium-containing brine. Background technique [0002] In recent years, the global climate has changed rapidly, oil reserves have decreased rapidly, and the energy crisis has increasingly threatened the stable and sustainable development of human society. As the carrier of electric energy storage and transportation, lithium is internationally recognized as the preferred species, and has become a new century strategic metal for reducing fossil energy consumption and protecting the environment. At present, the demand for lithium carbonate for mobile phones is growing at an annual rate of 25%. With the resolution of a series of technical bottlenecks in environmentally friendly vehicles driven by large-capacity lithium batteries, the demand for lithium in electric vehicles will develop on an unprecedented...

Claims

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Application Information

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IPC IPC(8): C01D15/04C01D15/08
Inventor 李丽娟袁承业张燕辉贾旭宏李晋峰时东聂锋宋富根刘志启曾忠民姬连敏张波
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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