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Method for extracting lithium from salt lake brine

A technology for extracting lithium from salt lake brine, applied in chemical instruments and methods, lithium compounds, alkali metal compounds, etc., can solve the problems of low extraction efficiency, serious environmental pollution, strong equipment corrosion, etc., to improve the utilization rate and improve the extraction rate. , the effect of eliminating environmental pollution problems

Inactive Publication Date: 2010-07-07
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] Therefore, the technical problem to be solved in the present invention is to provide a new method for extracting lithium from salt lake brine for the problems of low extraction efficiency, serious environmental pollution, strong corrosion of equipment and high production cost in the existing methods for extracting lithium from salt lake brine. The method of extracting lithium in the present method greatly improves the extraction rate of lithium, reduces the production cost, is also green and environmentally friendly, and will not cause environmental pollution

Method used

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

Examples

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Effect test

Embodiment 1

[0039] Take 20mL of salt lake brine containing 2mg / mL of lithium, add it to a 250mL volumetric flask, and add 12mL of 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid, 18mL of TBP, 2.1g of trichloro iron oxide, adjust the pH to 1.5, and shake for 10 minutes. The organic phase was separated by centrifugation, and the content of each element was measured by atomic absorption spectrophotometry, and the primary extraction rate of lithium was calculated to be 48%. Primary extraction rate of interfering ions: Na + 2.3%, Mg 2+ 2.1%, K + 2.7%, Ca 2+ 13%.

[0040] Take the organic phase and add 20 mL of salt lake brine and 2.1 g of ferric chloride to adjust the pH to 1.5. Shake for 10 minutes and perform a second extraction. The organic phase was separated by centrifugation, and the content of each element was determined by atomic absorption spectrophotometry. The secondary extraction rate of lithium is 82.4%, and the primary extraction rates of interfering ions are:...

Embodiment 2

[0043] Take 20 mL of salt lake brine containing 2 mg / ml lithium, add it to a 250 mL volumetric flask, and add 12 mL of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquid to it , 18mL TBP, 2.1g ferric chloride, adjust the pH to 1.5, and shake for 10 minutes. The organic phase was separated by centrifugation, and the content of each element was measured by atomic absorption spectrophotometry, and the primary extraction rate of lithium was calculated to be 48.6%. Primary extraction rate of interfering ions: Na + 2.4%, Mg 2+ 2.3%, K + 2.8%, Ca 2+ 13.7%.

[0044] The secondary extraction rate of lithium is 86.7%, and the primary extraction rates of interfering ions are: Na + 1.2%, Mg 2+ 1.4%, K + 1.2%, Ca 2+ 8.8%.

[0045] The third extraction rate of lithium is 97.8%, and the primary extraction rate of interfering ions is: Na + 0.1%, Mg 2+ 0.2%, K + 0.7%, Ca 2+ 3.2%.

Embodiment 3

[0047] Take 20mL of salt lake brine containing 2mg / mL lithium, add it to a 250mL volumetric flask, and add 12mL of 1-dodecyl-3-methylimidazolium hexafluorophosphate ionic liquid, 18mL TBP, 2.1g Ferric chloride, adjust the pH to 1.5, shake for 10 minutes. The organic phase was separated by centrifugation, and the content of each element was measured by atomic absorption spectrophotometry, and the primary extraction rate of lithium was calculated to be 60.1%. Primary extraction rate of interfering ions: N a+ 2.2%, Mg 2+ 2.3%, K + 2.8%, Ca 2+ 14.2%.

[0048] The secondary extraction rate of lithium is 81.7%, and the primary extraction rates of interfering ions are: Na + 1.0%, Mg 2+ 1.7%, K + 1.2%, Ca 2+ 1.8%.

[0049] The third extraction rate of lithium is 95.1%, and the primary extraction rate of interfering ions is: Na + 0.2%, Mg 2+ 0.3%, K + 0.5%, Ca 2+ 3.8%.

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Abstract

The invention provides a method for extracting lithium from salt lake brine, comprising the following steps: 1) mixing organic phase composed of salt lake brine, extracting agent and extracting medium with synergist, extracting the mixture and collecting the organic phase; 2) mixing the organic phase in step 1 with hydrochloric acid solution and carrying out back-extraction on the mixture, collecting aqueous phase to obtain aqueous solution of Lithium-ion; the step is characterized in that the extracting medium is hydrophobic ionic liquid. Compared with the traditional method for extracting lithium from salt lake brine with solvent gasoline as the medium, the method of the invention employs green and environmental-friendly ionic liquid as the medium; as a result, lithium salt extraction efficiency is improved, back-extraction acidity is lowered, what is more important is that environmental pollution and equipment corrosion due to use of a great deal of volatile organic solvent and high-concentration hydrochloric acid are avoided. In addition, the organic phase of the invention features fine cyclic applicability, thus greatly reducing production cost for extracting lithium from the salt lake brine.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a method for extracting lithium from salt lake brine. Background technique [0002] Lithium and its compounds are widely used in glass, ceramics, lubricants, electronics, metallurgy, chemical industry, medicine, manufacturing industry, refrigerants, aerospace and other fields. In recent years, with the increase in the demand for lithium in the above-mentioned traditional fields, and the continuous deepening of research on the development and application of lithium in high-tech fields such as aerospace, nuclear power generation, high-energy batteries, and lightweight high-specific-strength alloys, lithium has become a very important part of industrial production. Important metals are called "energy metals in the 21st century" (Zhu Zibao, China Chemical Industry News, 1998, 03, 19). Metal lithium has the advantages of light weight, high negative potential, and large specific energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00
Inventor 李在均王仕芳杨杰方云倪邦庆丁玉强程志翔陈光华
Owner JIANGNAN UNIV
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