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Method for extracting lithium from salt lake brine

A salt lake brine and extraction technology, applied in the chemical industry and extraction chemistry field, can solve the problems of solvent loss of extraction agent, strong corrosion of extraction equipment, and restrictions on large-scale industrial application, etc., to reduce concentration, improve strong corrosion, and simple operation reliable effect

Inactive Publication Date: 2015-02-18
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this system needs to use high concentration of tributyl phosphate, which is highly corrosive to the extraction equipment, and the extraction agent is not only severely dissolved in water during long-term operation, but also in acidic medium, tributyl phosphate is prone to degradation , especially its severe swelling effect on the materials used to make extraction equipment limits its large-scale industrial application

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

Examples

Experimental program
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Effect test

Embodiment 1

[0017] The method for extracting lithium in this salt lake brine provided by the present embodiment includes:

[0018] 1) Prepare the organic phase for extraction: take 300mL of tributyl phosphate and 700mL of N,N-bis(2-ethylhexyl)-3-butanoneacetamide to form a composite extractant, take 1000mL of sulfonated kerosene as a diluent and add to the compound in the extractant;

[0019] 2) Extract the water phase: take the salt lake brine of saturated magnesium chloride solution, which is LiCl-MgCl 2 -H 2 O system;

[0020] 3) Add HCl, FeCl to the extracted aqueous phase 3 ·6H 2 O, wherein, the ratio of the amount of substances controlling iron and lithium is 1.3:1, at this moment, the lithium concentration is 1.9604g / L, and the acid concentration is 0.05mol / L;

[0021] 4) Mix the extracted aqueous phase obtained in step 3) with the extracted organic phase obtained in step 1) at a volume ratio of 1:2, fully mix and shake for 6 minutes, then stand still and separate the liquid p...

Embodiment 2

[0023] The method for extracting lithium in this salt lake brine provided by the present embodiment includes:

[0024] 1) Prepare the organic phase for extraction: take 400mL of tributyl phosphate and 600mL of N,N-bis(2-ethylhexyl)-3-butanoneacetamide and mix them into a composite extractant, take 1000mL of sulfonated kerosene as diluent and add to the compound in the extractant;

[0025] 2) Extract the water phase: take the salt lake brine of saturated magnesium chloride solution, which is LiCl-MgCl 2 -H 2 O system;

[0026] 3) Add HCl, FeCl to the extracted aqueous phase 3 ·6H 2 O, wherein, the ratio of the amount of substances controlling iron and lithium is 1.3:1, at this moment, the lithium concentration is 1.9604g / L, and the acid concentration is 0.05mol / L;

[0027] 4) Mix the extracted aqueous phase obtained in step 3) with the extracted organic phase obtained in step 1) at a volume ratio of 1:2, fully mix and shake for 6 minutes, then stand still and separate the ...

Embodiment 3

[0029] The method for extracting lithium in this salt lake brine provided by the present embodiment includes:

[0030] 1) Prepare the organic phase for extraction: take 500mL of tributyl phosphate and 500mL of N,N-bis(2-ethylhexyl)-3-butanoneacetamide and mix them into a composite extractant, take 1000mL of sulfonated kerosene as a diluent and add to the compound in the extractant;

[0031] 2) Extract the water phase: take the salt lake brine of saturated magnesium chloride solution, which is LiCl-MgCl 2 -H 2 O system;

[0032] 3) Add HCl, FeCl to the extracted aqueous phase 3 ·6H 2 O, wherein, the ratio of the amount of substances controlling iron and lithium is 1.3:1, at this moment, the lithium concentration is 1.9604g / L, and the acid concentration is 0.05mol / L;

[0033] 4) Mix the extracted aqueous phase obtained in step 3) with the extracted organic phase obtained in step 1) at a volume ratio of 1:2, fully mix and shake for 6 minutes, then stand still and separate th...

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Abstract

The invention provides a method for extracting lithium from salt lake brine. The method comprises the following steps: adding HCl and FeCl3.6H2O to an extract water phase (an LiCl-MgCl2-H2O system), and controlling the ratio of amount of substances of iron and lithium to be 1.3 to 1; standing after fully mixing the extract water phase with an extract organic phase in a volume ratio of 1 to 2, and separating a liquid phase. By adopting the method, the problems that the corrosivity of high-concentration tributyl phosphate towards extraction equipment is stronger and the dissolution loss of an extracting agent in water is serious in long-term operation are solved, and the lithium extraction efficiency of the prior art is achieved. The extraction method is simple and reliable to operate.

Description

technical field [0001] The invention belongs to the technical fields of extraction chemistry and chemical industry, and in particular relates to a method for extracting lithium from salt lake brine by using a composite extractant. Background technique [0002] Salt lake brine is rich in various minerals, among which is also an important source of lithium. my country is rich in salt lake brine lithium resources, and its reserves rank among the top in the world. However, salt lake brine contains a variety of metal ions, how to separate and extract lithium from it is an important topic of current research. [0003] Lithium not only has important applications in the defense industry, but also has become increasingly important in the national economy, especially in the energy field: 6 Li and 7 Li is an important material for fuel in future nuclear fusion reactors and for nuclear fission reactions, respectively; it is also in increasing demand as a battery material. Therefore,...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22B3/40
CPCY02P10/20
Inventor 姬连敏李丽娟时东李晋峰宋雪雪聂锋宋富根曾忠民
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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