Method for extracting lithium salts in lithium-containing brine through extraction method

An extraction method and a technology for extracting lithium, which is applied in the field of extracting lithium salts from lithium-containing brine by extraction method, can solve the problems of strong corrosion of equipment and difficult industrialization, and achieve the effects of abundant sources, reduced dosage and optimized performance.

Active Publication Date: 2013-04-24
SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the method for extracting lithium salt from lithium-containing brine in the prior art is highly corrosive to equipment and difficult to industrialize, the pres

Method used

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  • Method for extracting lithium salts in lithium-containing brine through extraction method
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  • Method for extracting lithium salts in lithium-containing brine through extraction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] In the extractant, tributyl phosphate is selected as the neutral phosphorus oxygen compound, and N,N-dioctylbenzamide compound is selected as the amide compound, and its structural formula is as follows:

[0049]

[0050] Add 1 part of certain salt lake lithium-containing brine (Mg / Li=35 molar ratio) as shown in Table 1 in a separating funnel, add a certain amount of FeCl 3 (concentration in brine up to 3.5mol / L) as a co-extraction agent, shake to dissolve. Add 10 parts of extractant (compared to O / A=10), N, N-dioctylbenzamide compound and tributyl phosphate two kinds of extractant content 30% (V%) in the organic phase, N, The relative volume percentage ratio (V / V) of the N-dioctylbenzamide compound and the tributyl phosphate extractant is 1:20, and the extraction is carried out by shaking for 10 minutes. After the shaking is over, rest and stratify. Determination of Li in the equilibrium aqueous phase and organic phase, respectively + 、Na + 、K + and Mg 2+ Conc...

Embodiment 2

[0052] In the extractant, tributyl phosphate is selected as the neutral phosphorus oxygen compound, and N, N-dihexyl-4-methylbenzamide compound is selected as the amide compound: its structural formula is as follows:

[0053]

[0054] In a separating funnel, add 1 part of certain salt lake lithium-containing brine (Mg / Li=134 molar ratio) as shown in Table 1, add a certain amount of FeCl 3 (concentration in brine up to 1.0mol / L) as a co-extraction agent, shake to dissolve it. Add 5 parts of extractant (compared to O / A=5), the content of N, N-dihexyl-4-methylbenzamide and tributyl phosphate in the organic phase is 60% (V%) , N,N-dihexyl-4-methylbenzamide compound and tributyl phosphate relative volume percentage ratio (V / V) of the two extractants is 10:1, shaking for 10 minutes for extraction. After the shaking is over, rest and stratify. Determination of Li in the equilibrium aqueous phase and organic phase, respectively + 、Na + 、K + and Mg 2+ Concentration, the extrac...

Embodiment 3

[0056] In the extractant, the neutral phosphorus oxygen compound is selected from trioctyl phosphate, and the amide compound is selected from the compound of N, N-dihexyl-4-methylbenzamide: wherein,

[0057] N, the compound structural formula of N-dihexyl-4-methylbenzamide is as follows:

[0058]

[0059] The compound structural formula of trioctyl phosphate is as follows:

[0060]

[0061] In a separatory funnel, add 1 part of certain salt lake lithium-containing brine (Mg / Li=20 molar ratio) as shown in Table 1, add a certain amount of FeCl 3 (concentration in brine up to 0.5mol / L) as a co-extraction agent, shake to dissolve. Add 2 parts of extractant (compared to O / A=2), the compound of N, N-dihexyl-4-methylbenzamide and trioctyl phosphate content 80% (V %), N, N-dihexyl-4-methylbenzamide compound and trioctyl phosphate relative volume percentage ratio (V / V) of the two extractants is 5: 1, shaking for 10 minutes for extraction. After the shaking is over, rest and st...

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Abstract

The invention provides a method for extracting lithium salts in lithium-containing brine through an extraction method. Lithium is extracted through a co-extraction agent, an extraction agent and a diluent, wherein the extract is a mixture of an amide compound and a neutral phosphorus oxide compound, the structural formula of the amide compound is shown in the specification, and the structural formula of the neutral phosphorus oxide compound is shown in the specification. The method provided by the invention further optimizes the properties of extracted lithium, so that the method is more applicable to industrial application.

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 by means of an extraction method. Background technique [0002] Lithium not only has important applications in the defense industry, but its importance in the national economy is also becoming increasingly evident, especially in the energy field: 6 Li and 7 Li is an important material for the fuel of future nuclear fusion reactors and nuclear fission reactions, respectively; it is also in increasing demand as a battery material. Therefore, lithium is known as "the energy metal of the 21st century". The demand for lithium continues to grow at home and abroad, so the research, development and utilization of lithium resources are imminent. [0003] Salt lake brine is an important resource of lithium. my country is rich in salt lake brine lithium resources, and its reserves rank...

Claims

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Application Information

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IPC IPC(8): B01D11/04C01D15/00
Inventor 袁承业李丽娟时东李晋峰
Owner SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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