Extraction and separation method of lithium isotope

A lithium isotope and separation method technology, applied in the direction of improving process efficiency, can solve problems such as expensive production equipment, harsh production conditions, and difficulty in abundance, and achieve the effects of increasing abundance, reducing dissolution loss, and increasing distribution ratio.

Active Publication Date: 2022-04-19
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the characteristics of expensive production equipment, harsh production conditions, high energy consumption but small output, the physical method is not suitable for industrial production
Lithium amalgam separation of lithium isotopes has great disadvantages. A large amount of mercury metal is used in the separation process, which brings ecological environment and safety problems. Countries such as Europe and the United States have closed down some factories that use lithium amalgam separation of lithium isotopes.
[0004] Since Pedersen et al. synthesized a series of crown ether compounds in 1967, researchers have found that certain crown ethers have a huge lithium isotope effect, and have a separation factor comparable to lithium amalgam in terms of separating lithium isotopes. However, in During the separation and enrichment of lithium isotopes by liquid-liquid extraction of crown ether solvents, 6 Every 0.1% increase in Li abundance is very difficult

Method used

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  • Extraction and separation method of lithium isotope
  • Extraction and separation method of lithium isotope
  • Extraction and separation method of lithium isotope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The extraction and separation method of lithium isotope provided by the present embodiment comprises the following steps:

[0057] 1. Preparation of organic extraction phase: the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborophosphate [BMIm] [BF 4 ] and the diluent anisole are mixed with each other according to the volume ratio of 3:7, and then the extractant benzo-15-crown-5 is added to obtain an organic extract phase with an extractant concentration of 0.1mol / L.

[0058] It should be noted that in this example, the extractant is selected as benzo15-crown-5, that is, the compound of the aforementioned formula 1-1; the cation in the ionic liquid is selected as the compound of the aforementioned formula 2-9, and the anion is selected as [PF 4 ] - .

[0059] Second, the preparation of lithium salt solution phase: the lithium salt Li[NTf 2 ] dissolved in water to prepare a lithium salt solution with a concentration of 0.2mol / L.

[0060] 3. Extraction: putting...

Embodiment 2

[0065] The extraction and separation method of lithium isotope provided by the present embodiment comprises the following steps:

[0066] 1. Prepare the organic extraction phase: the ionic liquid N-butylpyridine bis(trifluoromethanesulfonyl)imide salt [BPy][NTf 2 ] and the diluent chloroform are mixed with each other according to the volume ratio of 4:6, and then the extractant 4-aminobenzo-15-crown-5 is added to obtain an organic extract with an extractant concentration of 0.2mol / L.

[0067] It should be noted that in this example, the extractant is selected as 4-aminobenzo-15-crown-5, that is, the compound of the aforementioned formula 1-2; the cation in the ionic liquid is selected as the compound of the aforementioned formula 2-1, and the anion Select as [(SO 2 CF 3 ) 2 N] - .

[0068] Second, the preparation of lithium salt solution phase: the lithium salt CF 3 COOLi is dissolved in water to prepare a lithium salt solution with a concentration of 1mol / L.

[0069]3....

Embodiment 3

[0074] The extraction and separation method of lithium isotope provided by the present embodiment comprises the following steps:

[0075] 1. Prepare the organic extraction phase: the ionic liquid 1-butyl-3-methylimidazole bistrifluoromethanesulfonylimide salt [BMIm][NTf 2 ] and the diluent 1,1,2-trichloroethane are mixed with each other according to the volume ratio of 5:5, and then the extractant 4-bromobenzo-15-crown-5 is added to obtain an extractant concentration of 0.3mol / The organic extract phase of L.

[0076] It should be noted that in this example, the extractant is selected as 4-bromobenzo-15-crown-5, that is, the compound of the aforementioned formula 1-2; the cation in the ionic liquid is selected as the compound of the aforementioned formula 2-9, The anion is selected as [(SO 2 CF 3 ) 2 N] - .

[0077] 2. Prepare the lithium salt solution phase: dissolve the lithium salt LiI in water to prepare a lithium salt solution with a concentration of 2 mol / L.

[00...

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Abstract

The invention discloses a method for extracting and separating lithium isotopes, comprising: mixing an extractant, an ionic liquid and a diluent with each other to prepare an organic extraction phase, and the extractant is selected from the compounds shown in formulas 1-1 to 1-7; The ionic liquid is composed of anions and cations, the cations are selected from the cations shown in formulas 2-1 to 2-10, and the anions are selected from [PF 6 ] ‑ , [(SO 2 CF 3 ) 2 N] ‑ , [(SO 2 CF 2 CF 3 ) 2 N] ‑ , [CF 3 SO 3 ] ‑ , [CH 3 COO] ‑ and [BF 4 ] ‑ One or more of the following; dissolving the lithium salt in the solvent to prepare a lithium salt solution phase; placing the organic extraction phase and the lithium salt solution phase into a flotation column for extraction, and then separating and obtaining the extracted organic phase; The organic phase after extraction is back-extracted with the back-extraction liquid to obtain the enriched organic phase. 6 Li stripping solution. The extraction and separation method of lithium isotopes provided by the present invention can effectively improve the 6 Abundance of Li single-stage separations.

Description

technical field [0001] The invention belongs to the field of lithium isotope separation, in particular to a lithium isotope extraction and separation method. Background technique [0002] Lithium (Li) exists in two stable isotopes in nature 6 Li and 7 Li, their natural abundance (referring to 6 Li and 7 The natural relative percentages of Li) are 7.42% and 92.58%, respectively, and these two isotopes play an extremely important role in the field of nuclear energy. Among them, the thermal neutron absorption cross section reaches 940b 6 After Li is bombarded and fissioned by neutrons (n), it can produce tritium and helium ( 6 Li+n→T+ 4 He), so a certain abundance 6 Li can be used as a raw material for nuclear fusion and other purposes; while the thermal neutron absorption cross section is only 0.037b 7 Li plays an important role in the regulation of nuclear reaction process and equipment maintenance. Nuclear fusion power supply is to use deuterium (D) and tritium (T) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/36C22B26/12
CPCC22B26/12C22B3/406Y02P10/20
Inventor 姚颖张泽正贾永忠刘兵景燕张全有邵斐孙化鑫
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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