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Method for extraction separating of lithium isotope by virtue of sol-gel material

A lithium isotope and extraction technology, which is applied in the field of extraction and separation of lithium isotopes with sol-gel materials, can solve problems such as safety and environmental pollution, and achieve the effects of reducing production costs, improving isotope separation coefficients, and good recyclability

Inactive Publication Date: 2014-05-07
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to provide a new lithium isotope extraction and separation method for the existing lithium amalgam method to separate lithium isotopes due to serious environmental pollution and safety problems. The lithium isotope separation efficiency of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In a 25mL Erlenmeyer flask with a stopper, add 10mmol / L10mL lithium trifluoroacetate aqueous solution and 1.000g sol-gel solid phase (benzo15-crown-5,1-octyl-3-methylimidazolium tetrafluoroborate ), with a rotating speed of 200r / min and a mechanical oscillation time of 7h, the aqueous phase and the sol-gel solid phase were separated by centrifugation, and the solid phase was collected. The solid phase was washed with deionized water and then dried. Add 10mL of 20mmol / L HCl solution, mechanically oscillate for 7h at a speed of 200r / min, centrifuge to separate the water phase and the solid phase, and collect the water phase. The solid phase was washed with deionized water and dried for the next extraction, and the operation was repeated five times. Isotope separation coefficient ( 7 Li / 6 Li) is 1.045±0.003.

Embodiment 2

[0024] In a 25mL Erlenmeyer flask with a stopper, add 10mmol / L10mL lithium thiocyanate aqueous solution and 1.000g sol-gel solid phase (benzo15-crown-5,1-octyl-3-methylimidazolium tetrafluoroborate ), with a rotating speed of 200r / min and a mechanical oscillation time of 7h, the aqueous phase and the sol-gel solid phase were separated by centrifugation, and the solid phase was collected. The solid phase was washed with deionized water and then dried. Add 10mL of 20mmol / L HCl solution, mechanically oscillate for 7h at a speed of 200r / min, centrifuge to separate the water phase and the solid phase, and collect the water phase. The solid phase was washed with deionized water and dried for the next extraction, and the operation was repeated five times. Isotope separation coefficient ( 7 Li / 6 Li) is 1.036±0.002.

Embodiment 3

[0026]In a 25mL Erlenmeyer flask with a stopper, add 10mmol / L10mL lithium trifluoroacetate aqueous solution and 1.000g solid phase (benzo-15-crown-5 and 1-octyl-3-methylimidazolium hexafluorophosphate), rotating speed 200r / min Mechanical shaking time 7h, centrifuge to separate the water phase and the solid phase, and collect the solid phase. The solid phase was washed with deionized water and then dried. Add 10mL of 20mmol / L HCl solution, mechanically oscillate at a speed of 200r / min for 7h, centrifuge to separate the water phase and the solid phase, and collect the water phase. The solid phase was washed with deionized water and dried for the next extraction, and the operation was repeated five times. Isotope separation coefficient ( 7 Li / 6 Li) is 1.046±0.002.

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Abstract

The invention provides a solid-liquid extraction method for extraction separating of a lithium isotope by virtue of a sol-gel material. The method comprises the following steps: forming a mesoporous material through sol-gel by adopting hydrophobic ion liquid, loading benzo-crown ether on the mesoporous material as an extraction agent, carrying out extraction separating on the lithium isotope, extracting a solid-liquid mixture formed by different lithium saline solutions and the solid-phase sol-gel material, collecting water and solid phases, mixing the solid phase after extracting and a hydrochloric acid solution, carrying out reextraction, and collecting a water phase to obtain an aqueous solution of lithium ions, wherein a synergist is the hydrophobic ion liquid, and the extraction agent is benzo15-crown-5. At present, a lithium amalgam method is used for separating the lithium isotope, however, serious environmental safety problem is brought caused by large amount of mercury used in the production process; with the adoption of the method, as the environment-friendly ion liquid and the benzo15-crown-5 are used as the synergist and the extraction agent, respectively, the lithium salt extraction efficiency is improved, and the separation efficacy of the isotope is also high; the used sol-gel phase can be reextracted by hydrochloride, the purpose of recycling is reached, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of lithium isotope separation, in particular to a method for extracting and separating lithium isotopes from sol-gel materials. Background technique [0002] The element lithium is found in nature 6 Li and 7 The abundances of two stable isotopes of Li are about 7.5% and 92.5%, respectively. 6 Li and 7 Li plays a very different role in nuclear reactions. 6 After Li is bombarded by neutrons, tritium and helium are generated, so that tritium in the fusion reactor can continue to proliferate, so 6 Li is an essential nuclear fusion reactor fuel. 7 Li is used as the core coolant and heat transfer agent of nuclear fusion reactors. 7 Li can also be used as a molten salt medium for thorium piles. isotope of the element lithium 6 Li and 7 The process of Li separation is called lithium isotope separation. [0003] At present, there are many methods for lithium isotope separation, which can be roughly divided into chemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D59/22
Inventor 周文孙晓利顾玲顾志国
Owner JIANGNAN UNIV
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