Method for extracting lithium salt from lithium-contained brine by using extraction process

A technology for extracting lithium and extraction method, which is applied in chemical instruments and methods, lithium compounds, alkali metal compounds, etc., can solve the problems of strong corrosion of equipment and difficulty in industrialization, and achieve the effects of rich sources, reduced dosage, and optimized performance

Inactive Publication Date: 2014-01-22
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 in the prior art that the method of extracting lithium salt from lithium-containing brine by extraction method is highly corrosive to equipment and difficult to indus

Method used

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  • Method for extracting lithium salt from lithium-contained brine by using extraction process
  • Method for extracting lithium salt from lithium-contained brine by using extraction process
  • Method for extracting lithium salt from lithium-contained brine by using extraction process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] In the extractant, tributyl phosphate is selected as the neutral phosphorus oxygen compound, and N, N-di(2-ethylhexyl)-3-butanoneacetamide compound is selected as the amide compound, and its structural formula is as follows:

[0056]

[0057] 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 1.5mol / L) as a co-extraction agent, shake to dissolve. Add 5 parts of extractant (compared to O / A=5), N, N-bis(2-ethylhexyl)-3-butanoneacetamide compound and tributyl phosphate two kinds of extractant content in the organic phase 60% (V%), the ratio (V / V) of the relative volume percentages of two (2-ethylhexyl)-3-butanoneacetamide compounds and tributyl phosphate tributyl phosphate is 1: 2. Shake for 10 minutes for extraction. After the shaking is over, rest and stratify. Determination of Li in the equilibrium aqueous phase and organic phase, r...

Embodiment 2

[0059] In the extractant, the neutral phosphorus oxygen compound is selected from tributyl phosphate, and the amide compound is selected from the compound of N, N-dihexyl-3-butanoneacetamide: its structural formula is as follows:

[0060]

[0061] 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 2 parts of extractant (compared to O / A=2), the content of N, N-dihexyl-3-butanoneacetamide and tributyl phosphate in the organic phase is 80% (V%), N, N-dihexyl-3-butanoneacetamide compound and tributyl phosphate two kinds of extraction solvent relative volume percentage ratio (V / V) is 1:3, shake 6 minutes to carry out 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...

Embodiment 3

[0063] In the extractant, tributyl phosphate is selected as the neutral phosphorus oxygen compound, and N, N-dihexyl-3-butanoneacetamide compound is selected as the amide compound, and its structural formula is as follows:

[0064]

[0065] An effective extraction system requires not only excellent extraction performance, but also good stripping performance. For this reason, 20% N, N-dihexyl-3-butanoneacetamide, 30% tributyl phosphate, kerosene The system loads the organic phase, and the 80% tributyl phosphate-kerosene system loads the organic phase, and respectively uses 6mol / L HCl to back-extract the example of Li.

[0066] In a separating funnel, add 1 part of certain salt lake lithium-containing brine (Mg / Li=30 molar ratio) as shown in Table 1, add a certain amount of FeCl 3 (concentration in brine up to 1.5mol / L) as a co-extraction agent, shake to dissolve. Add 2 parts of extractant (compared to O / A=2) and shake for 10 minutes to extract. Take 10 parts of the loaded ...

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Abstract

The invention provides a method for extracting lithium salt from lithium-contained brine by using an extraction process. The method comprises the step of extracting lithium by using a co-extraction agent, an extraction agent and a diluent, wherein the extraction agent is a mixture of an amide compound and a neutral phosphorus oxide compound, the amide compound has the structural formula shown in the specification, and the neutral phosphorus oxide compound has the structural formula shown in the specification. The method provided by the invention is used for further optimizing the performance of the extracted lithium and is more suitable for 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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IPC IPC(8): C01D15/00
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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