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Method for extracting lithium salts in lithium-containing brine

A technology for extracting lithium and brine, applied in chemical instruments and methods, lithium compounds, solvent extraction of liquid solutions, etc., 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

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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 present invention provides a method for extracting lithium salt from lithium-containing brine that can reduce the corrosion to equipment and is suitable for industrial applications. Lithium method

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  • Method for extracting lithium salts in lithium-containing brine
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  • Method for extracting lithium salts in lithium-containing brine

Examples

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Embodiment 1

[0047] In the extractant, tributyl phosphate is selected as the neutral phosphorus-oxygen compound, and the compound of the following structural formula is selected as the amide compound:

[0048]

[0049] In a separatory funnel, add 1 part of certain salt lake lithium-containing brine (Mg / Li=500 molar ratio) as shown in Table 1, add a certain amount of FeCl 3 (concentration in brine up to 0.05mol / L) as a co-extraction agent, shake to dissolve. Add 1 part of extractant (compared to O / A=1), the content of two extractants of amides and tributyl phosphate in the organic phase is 80% (V%), two extracts of amides and tributyl phosphate The relative volume percentage ratio (V / V) of the reagents is 20:1, and the extraction is carried out by shaking for less than 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+ , thus calculating the extraction rate of Li to be...

Embodiment 2

[0051] In the extractant, tributyl phosphate is selected as the neutral phosphorus-oxygen compound, and the compound of the following structural formula is selected as the amide compound:

[0052]

[0053] In a separatory funnel, add 1 part of certain salt lake lithium-containing brine (Mg / Li=140 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 amides and tributyl phosphate in the organic phase is 60% (V%), two extractions of amides and tributyl phosphate The relative volume percentage ratio (V / V) of the reagents is 10:1, 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+ Concentration, the extraction rate of Li calculated from this is 87.60%, ...

Embodiment 3

[0055] In the extractant, tributyl phosphate is selected as the neutral phosphorus oxygen compound, and N, N-di(2-ethylhexyl) acetamide is selected as the amide compound, and its structural formula is as follows:

[0056]

[0057] In a separating funnel, add 1 part of certain salt lake lithium-containing brine (Mg / Li=35 molar ratio) as shown in Table 1, 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), the content of amide compounds and tributyl phosphate in the organic phase is 30% (V%), two extractions of amides and tributyl phosphate The relative volume percentage ratio (V / V) of the reagents was 1:20, and the extraction was 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+ Concentration, the extraction rate of L...

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Abstract

The invention provides a method for extracting lithium salts in lithium-containing brine. 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 the 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. 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 among the top in the world. How...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D11/04C01D15/00
Inventor 袁承业李丽娟许庆仁李晋峰时东张燕辉
Owner SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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