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Method for extracting lithium isotopes

A lithium isotope and extraction technology, applied in the separation of different isotopic elements, separation methods, chemical instruments and methods, etc., can solve the problems of limiting the reusability of resin materials, achieve good lithium isotope separation efficiency, improve stability, and avoid Human health hazards and effects of environmental pollution

Active Publication Date: 2017-07-28
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

However, the strong complexation energy of the cage ether structure to lithium ions makes the desorption of lithium ions a new problem, which limits the reusability of resin materials.

Method used

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  • Method for extracting lithium isotopes
  • Method for extracting lithium isotopes
  • Method for extracting lithium isotopes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] In a 100mL separatory funnel, add 20mL of aqueous phase (0.2mol / L lithium thiocyanate) and 40mL of organic phase (0.1mol / L hydrophobic ionic liquid containing crown ether structure: 1-allyl-3 -(6'-Oxo-benzo-15-crown-5-hexyl)imidazole hexafluorophosphate, abbreviated as [A(Benzo15C5)HIM][PF 6 ], the diluent is chloroform), violently shaken on the Conrad shaker for 10min, centrifuged to separate the aqueous phase and the organic phase, and collected the organic phase. The extraction rate of a single lithium was tested to be 26.1%. The organic phase was mixed with 20 mL of 0.2 mol / L HCl solution, placed on a Consonian shaker for 20 min, centrifuged, and the aqueous phase was collected. The organic phase is directly used for stripping, and the operation is repeated 5 times, and the stripping yields of 1 and 5 operations of lithium are respectively 27.4% and 99.7%, and the isotope separation coefficient α ( 6 Li / 7 Li) was 1.039.

Embodiment example 2

[0057] In a 100mL separatory funnel, add 20mL of aqueous phase (0.5mol / L lithium trifluoromethyl acetate) and 20mL of organic phase (0.4mol / L hydrophobic ionic liquid containing crown ether structure: 1-allyl -3-(6'-Oxy-benzo-15-crown-5-hexyl)imidazole bistrifluoromethylsulfonimide salt, abbreviated as [A(Benzo15C5)HIM][N(SO 2 CF 3 ) 2 ], the diluent is dichlorobenzene), violently oscillating 20min on a Conrad shaker, centrifuging the aqueous phase and the organic phase, collecting the organic phase, and testing to obtain a single lithium extraction rate of 23.2%. The organic phase was mixed with 24 mL of 0.5 mol / L HCl solution, placed on a Consonian shaker for 30 min, centrifuged, and the aqueous phase was collected. The organic phase is directly used for stripping, and the operation is repeated 5 times, and the stripping yields of 1 and 5 operations of lithium are respectively 31.4% and 99.2%, and the isotope separation coefficient α ( 6 Li / 7 Li) was 1.041.

Embodiment 3

[0059] In a 100mL separatory funnel, add 40mL of aqueous phase (0.8mol / L lithium thiocyanate) and 20mL of organic phase (1.0mol / L hydrophobic ionic liquid containing crown ether structure: 1-allyl-3 -(6'-Oxo-benzo-15-crown-5-hexyl)imidazole hexafluorophosphate, abbreviated as [A(Benzo15C5)HIM][PF 6 ], the diluent is dichlorobenzene), violently oscillating 30min on a Conrad shaker, centrifuging the aqueous phase and the organic phase, collecting the organic phase, and testing to obtain a single lithium extraction rate of 21.7%. The organic phase was mixed with 20 mL of 1.0 mol / L HCl solution, placed on a Consonian shaker for 45 minutes, centrifuged, and the aqueous phase was collected. The organic phase is directly used for stripping, and the operation is repeated 5 times, and the stripping yields of 1 and 5 operations of lithium are respectively 27.9% and 99.5%, and the isotope separation coefficient α ( 6 Li / 7 Li) was 1.043.

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Abstract

The invention discloses a method for extracting lithium isotopes. A chelating agent and a diluent are prepared into an extractive organic phase, and the lithium isotopes are extracted from and separated out of a lithium salt water phase. Hydrophobic ionic liquid with a crown ether structure is adopted as the chelating agent and composed of positive ions and negative ions, wherein positive ions with a structural formula I and / or a structural formula II are adopted as the positive ions. One or more of PF6<->, (SO2CF3)2N<->, (SO2CF2CF3)2N<-> and BF4<-> is / are adopted as the negative ions. One or more of kerosene, octanone, chloroform, dichloromethane, carbon tetrachloride, tetrachloroethylene, nitrobenzene, methylbenzene, dimethylbenzene, diethylbenzene, bromobenzene, anisole, nitromethane, 2-methylcyclohexanone, methylisobutylketone, chlorobenzene, dichlorobenzene, trichlorobenzene and diphenyl ether is / are adopted as the diluent. The method has the advantages of being safe, green, efficient and good in stability and can be used for multi-stage enrichment and separation of the lithium isotopes.

Description

technical field [0001] The invention relates to the technical field of lithium isotope separation, in particular to a method for extracting lithium isotopes. Background technique [0002] Lithium (Li) is the lightest metal element in the world. Lithium is widely found in various minerals, fluids and rocks in nature. There are abundant lithium resources in the world, with proven reserves of about 36.7 million tons. [0003] Natural lithium consists of lithium 6( 6 Li) and lithium 7( 7 Li) two isotopic compositions, their abundances are 7.52% and 92.48% respectively. 6 Li and 7 Li plays a very different role in the atomic energy industry, 6 Li is an indispensable fuel for the development of controllable thermonuclear fusion reactors and a necessity for national defense strategy security assurance. This is because 7 The thermal neutron absorption cross section of Li is only 0.037b, while 6 The thermal neutron absorption cross section of Li can reach 940b, 6 Li than 7 L...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D59/24
CPCB01D59/24
Inventor 景燕肖江贾永忠姚颖石成龙王兴权
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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