Method for extracting and separating lithium isotope aqueous solution

A lithium isotope and aqueous solution technology, applied in the field of solvent extraction, can solve the problems of high production cost and serious environmental pollution, and achieve the effects of saving production cost, improving isotope extraction rate, and significant isotope separation ability

Active Publication Date: 2012-05-02
盐城福万家保温板有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a new lithium isotope extraction and separation method for the existing lithium amalgam method for separating lithium isotopes, which has

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  • Method for extracting and separating lithium isotope aqueous solution
  • Method for extracting and separating lithium isotope aqueous solution
  • Method for extracting and separating lithium isotope aqueous solution

Examples

Experimental program
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Effect test

Embodiment 1

[0032]In a 250mL separatory funnel, add 20mL of water phase (0.1mol / L lithium hydroxide+1.6mol / L sodium hydroxide+0.2mol / L 1-butyl-3-methylimidazolium bromide, in which lithium ion: Hydroxide ion: the ratio of the molar concentration of co-extractant is 1:17:2) and 40mL organic phase (1,2-dichlorobenzene solution of 0.2mol / L azaphenanthrene), shake vigorously for about 20 minutes, centrifuge The aqueous and organic phases were separated and the organic phase was collected. After the organic phase was washed once with 5 mL deionized water, 0.1 mol / L Na 2 SO 4 The solution was 20 mL, shaken vigorously for about 20 minutes, centrifuged, and the aqueous phase was collected. The organic phase was directly used for the next extraction, and the operation was repeated fifteen times. Once / fifteen times lithium extraction rate is 15.2% / 99.3%, once / fifteen times lithium stripping rate is 12%, 99.1%, isotope separation coefficient ( 7 Li / 6 Li) was 1.022.

Embodiment 2

[0034] In a 250mL separatory funnel, add 20mL of water phase (0.1mol / L lithium hydroxide + 1.6mol / L sodium hydroxide + 0.2mol / L 1-octyl-3-methylimidazole bromide, in which lithium ion: Hydroxide ion: the ratio of the molar concentration of co-extractant is 1:17:2) and 20mL organic phase (1,2-dichlorobenzene solution of 0.2mol / L azaphenanthrene), shake vigorously for about 30 minutes, centrifuge The aqueous and organic phases were separated and the organic phase was collected. After the organic phase was washed once with 5 mL deionized water, 0.1 mol / L Na 2 SO 4 40mL of the solution was shaken vigorously for about 30 minutes, centrifuged, and the aqueous phase was collected. The organic phase was directly used for the next extraction, and the operation was repeated fifteen times. Once / fifteen times lithium extraction rate is 16.6% / 99.7%, the stripping rate of once / fifteen times lithium is 12.7% / 99.5%, isotope separation coefficient ( 7 Li / 6 Li) was 1.024.

Embodiment 3

[0036] In a 250mL separatory funnel, add 40mL of water phase (0.2mol / L lithium hydroxide + 4mol / L sodium hydroxide + 0.2mol / L 1-octyl-3-methylimidazolium tetrafluoroborate, in which lithium ions : hydroxide ion: the molar concentration ratio of co-extractant is 1: 20: 1) and 20mL organic phase (1,3-dichlorobenzene solution of 0.2mol / L azaphenanthrene), shake vigorously for about 50 minutes, The aqueous and organic phases were separated by centrifugation, and the organic phase was collected. After the organic phase was washed once with 10 mL deionized water, 0.5 mol / L Na 2 SO 4 40mL of the solution was shaken vigorously for about 50 minutes, centrifuged, and the aqueous phase was collected. The organic phase was directly used for the next extraction, and the operation was repeated fifteen times. Once / fifteen times lithium extraction rate is 17.1% / 99.9%, once / fifteen times lithium stripping rate is 16.0% / 99.6%, isotope separation coefficient ( 7 Li / 6 Li) is 1.020.

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Abstract

The invention relates to a method for extracting and separating a lithium isotope aqueous solution and belongs to the technical field of solvent extraction. In the method, hydrophobic naphthisoazine and hydrophilic ionic liquid respectively serve as an extracting agent and a synergist; and naphthisoazine, the ionic liquid and lithium ions form a stable ion associated matter under an alkaline condition, lithium ions enter into an organic phase through aqueous phase extraction and an obvious isotope separation effect is generated. The method comprises the following steps of: regulating the alkalinity of a lithium hydroxide solution, respectively adding the extracting agent, the synergist and the hydrophilic ionic liquid serving as an extracting medium, oscillating at normal pressure and normal temperature, standing still for layering, collecting the organic phase, and adding sodium sulfate into the organic phase to carry out lithium salt back extraction so that the lithium ions come back to the aqueous phase, thereby realizing the selective extraction and high-efficiency enrichment of lithium isotopes.

Description

technical field [0001] The invention relates to a method for extracting and separating lithium isotope aqueous solution, which belongs to the technical field of solvent extraction. Background technique [0002] Lithium has 6 Li (7.52%) and 7 Li (92.48%) two stable isotopes. in, 6 Li is bombarded and fissioned by neutrons (n) to produce tritium and helium ( 6 Li+n→T+ 4 He), so that the tritium in the fusion reactor can be continuously multiplied. 6 Li is the nuclear fusion reactor fuel ( 6 Li>30%), hydrogen bomb charge ( 6 Li>90%) and neutron shielding materials. 7 Li is used as a pH regulator for primary cooling in pressurized water reactors, as a heat transfer agent for heat conduction in fusion reactors ( 7 Li>99.96%) and the neutral medium of thorium heap molten salt ( 7 Li > 99.995%). Lithium isotopes are essential nuclear raw materials. [0003] my country's new energy strategy puts the development of nuclear power in a very important position. A...

Claims

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Application Information

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IPC IPC(8): B01D59/24
Inventor 李在均徐晶晶肖雪清满意顾志国王光丽
Owner 盐城福万家保温板有限公司
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