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Dialkyl sulphone extraction agent and method for extracting lithium from salt lake brine

A technology of salt lake brine and extractant, applied in the field of extraction chemistry, can solve the problems of easy formation of the third phase, accelerated hydrolysis of TBP, enlargement, etc., and achieve the effects of high circulating fluidity, prolonging the renewal period, and high separation coefficient

Active Publication Date: 2019-05-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the TBP-kerosene system has high extraction capacity and selectivity for lithium, there are also the following problems: (1) TBP swells and corrodes extraction equipment made of materials such as PVC and PP seriously, which not only shortens the service life of the equipment, but also shortens the service life of the equipment Macromolecular organic matter enters the extraction system, which affects the fluidity and phase separation of the extraction system; (2) TBP density (0.979g / mL) and molecular polarity are large, and its extract TBP·LiFeCl 4 and TBP·HFeCl 4 The density and molecular polarity of TBP are further increased, and the solubility in weakly polar kerosene (diluent) is small, and the third phase is easily formed during the extraction process, which is not conducive to the stable operation of the extraction process; (3) TBP is in acidic or alkaline In the aqueous solution, a hydrolysis reaction will occur, especially in the process of alkali neutralization and regeneration of the organic phase. Excessive local alkali will greatly accelerate the hydrolysis of TBP, resulting in more water-soluble monobutyl phosphate (MBP) and dibutyl phosphate (DBP )

Method used

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  • Dialkyl sulphone extraction agent and method for extracting lithium from salt lake brine
  • Dialkyl sulphone extraction agent and method for extracting lithium from salt lake brine
  • Dialkyl sulphone extraction agent and method for extracting lithium from salt lake brine

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Treat the salt lake brine of the composition shown in Table 1 according to the general method: add FeCl to the brine shown in Table 1 3 Mix and dissolve and make Fe / Li=1.4 (molar ratio) to make extract material liquid; Extract organic phase is the mixture of diisoamyl sulfone and D70 solvent oil, and volume fraction is respectively 40% and 60%; Extract O / A= 2.5; washing O / A=25; stripping agent: 6mol / L HCl, stripping O / A=30; regeneration agent: 0.5mol / L NaOH solution, regeneration O / A=30.

[0082] The single-stage lithium extraction rate is 66.7%, the single-stage lithium stripping rate is 91.3%, and the single-stage lithium-magnesium separation coefficient (β Li / Mg ), lithium-sodium separation coefficient (β Li / Na ), lithium-potassium separation coefficient (β Li / K ) reached 585.7, 102.8, and 112.4 respectively. After 6 stages of extraction, 3 stages of washing, and 3 stages of stripping, the recovery rate of lithium is greater than 99.0%, and Li in the stripping raf...

Embodiment 2

[0084] Treat the salt lake brine of the composition shown in Table 1 according to the general method: add FeCl to the brine shown in Table 1 3 Mix and dissolve and make Fe / Li=1.5 (molar ratio) to make extract material liquid; Extract organic phase is the mixture of diisoamyl sulfone and D80 solvent oil, and volume fraction is respectively 50% and 50%; Extract O / A= 2.0; washing O / A=30; stripping agent: 6mol / L HCl, stripping O / A=30; regeneration agent: 0.5mol / L KOH solution, regeneration O / A=20.

[0085] The single-stage lithium extraction rate is 65.8%, the single-stage lithium stripping rate is 92.4%, and the single-stage lithium-magnesium separation coefficient (β Li / Mg ), lithium-sodium separation coefficient (β Li / Na ), lithium-potassium separation coefficient (β Li / K ) reached 564.3, 98.4, and 101.5 respectively. After 6 stages of extraction, 3 stages of washing, and 3 stages of stripping, the recovery rate of lithium is greater than 99.0%, and Li in the stripping raffi...

Embodiment 3

[0087] Treat the salt lake brine of the composition shown in Table 1 according to the general method: add FeCl to the brine shown in Table 1 3 Mix and dissolve and make Fe / Li=1.8 (molar ratio) to make extract material liquid; Extract organic phase is the mixture of diisooctyl sulfone and 260# solvent oil, volume fraction is respectively 40% and 60%; Extract O / A =2.0; washing O / A=30; stripping agent: 6mol / L HCl, stripping O / A=30; regeneration agent: 0.5mol / L Na 2 CO 3 Solution, regeneration O / A=30.

[0088] The single-stage lithium extraction rate is 62.7%, the single-stage lithium stripping rate is 93.5%, and the single-stage lithium-magnesium separation coefficient (β Li / Mg ), lithium-sodium separation coefficient (β Li / Na ), lithium-potassium separation coefficient (β Li / K ) reached 625.7, 120.3, and 108.6 respectively. After 7 stages of extraction, 3 stages of washing, and 3 stages of stripping, the recovery rate of lithium is greater than 99.0%, and Li in the strippin...

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Abstract

The invention discloses a dialkyl sulphone extraction agent and a method for extracting lithium from salt lake brine. The method comprises the following steps of extracting lithium from the salt lakebrine using the dialkyl sulphone compound as the extraction agent. The extraction agent has excellent lithium extracting capacity, excellent selectivity and excellent hydrolytic stability; and when the extraction agent is used, precipitation or flocculates which influence the extraction process are not liable to form.

Description

technical field [0001] The invention relates to the field of extraction chemistry, in particular to a dialkyl sulfone extractant and a method for extracting lithium from salt lake brine. Background technique [0002] Lithium is an important strategic resource. In nature, lithium mainly occurs in solid minerals and liquid deposits. Among them, lithium resources in salt lake brine account for about 90% of the world's proven lithium resources. my country has abundant salt lake brine resources, mainly distributed in Qinghai, Tibet and other regions. The salt lake lithium resources in the Qaidam Basin in Qinghai are very rich, with LiCl reserves of about 2.8×10 7 t. This type of brine has two notable features: (1) high lithium content, up to 2-3g / L; (2) high ratio of magnesium to lithium, usually greater than 40 (mass ratio). Due to the very similar chemical properties of lithium and magnesium, conventional methods are difficult to extract lithium from high-magnesium-lithium ...

Claims

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Application Information

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IPC IPC(8): C22B3/34C22B26/12
CPCY02P10/20
Inventor 李林艳李湘兰李晓宏
Owner TSINGHUA UNIV