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A method and device for lithium isotope separation and enrichment using membrane extraction

A lithium isotope, separation and enrichment technology, applied in the separation of different isotopic elements, separation methods, dispersed particle separation, etc., can solve the problems of high energy consumption and low efficiency of lithium isotope separation, to avoid difficult enrichment, overcome the release The effect of high heat and stable operation

Inactive Publication Date: 2016-11-02
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method and application of lithium isotope separation and enrichment by membrane extraction, which mainly solves the technical problems of high energy consumption and low efficiency of lithium isotope separation in the prior art

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  • A method and device for lithium isotope separation and enrichment using membrane extraction

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Embodiment 1

[0034] The polyethylene porous hollow fiber membrane with ion transfer function is prepared into a hollow fiber membrane module. The module parameters are: 12 membrane modules per inch (9 as the membrane extraction stage, 3 as the stripping stage); the module membrane is always effective The area is 9m 2 .

[0035] The extraction agent that has enrichment effect on 7Li is adopted: 1-phenylazo-2-naphthol / methyl trioctyl ammonium chloride, and o-dichlorobenzene is used as the organic solvent; 1-phenylazo in the extraction phase - The concentration of 2-naphthol is 0.4mol / L, and the concentration of methyltrioctylammonium chloride is 0.2mol / L.

[0036] The liquid phase of the material is an aqueous solution of 0.2 mol / L lithium hydroxide and 1 mol / L sodium hydroxide, wherein the lithium element is 7Li and 6Li in natural abundance, which are 0.925 and 0.075, respectively.

[0037] The stripping phase is 1mol / L hydrochloric acid solution.

[0038] The device for membrane extract...

Embodiment 2

[0041] The polytetrafluoroethylene flat membrane with ion transfer function is prepared into a flat membrane module. The module parameters are: 600mm*400mm membrane module number 40 (for the membrane extraction stage), and the total effective area of ​​the module membrane is 10.8m 2 .

[0042] A vibrating sieve tray column with a height of 2000mm and a diameter of 50mm is used as a stripping device.

[0043] The extraction agent that has enrichment effect on 7Li is adopted: 1-phenylazo-2-naphthol / methyl trioctyl ammonium chloride, and o-dichlorobenzene is used as the organic solvent; 1-phenylazo in the extraction phase The concentration of -2-naphthol is 0.4mol / L, and the concentration of methyltrioctylammonium chloride is 0.1mol / L.

[0044] The liquid phase of the material is an aqueous solution of 0.1 mol / L lithium hydroxide and 0.5 mol / L sodium hydroxide, wherein the lithium element is 7Li and 6Li in natural abundance, which are 0.925 and 0.075, respectively.

[0045] The...

Embodiment 3

[0049] The polyethylene vinyl alcohol flat membrane with ion transfer function is prepared into a flat membrane module. The module parameters are: the number of 600mm*400mm membrane modules is 120 (for the membrane extraction stage), and the total effective area of ​​the module membrane is 32m 2 .

[0050] A vibrating sieve tray column with a height of 2000mm and a diameter of 50mm is used as the stripping section.

[0051] The polyethylene vinyl alcohol flat film used in this example is a self-prepared film, and its preparation method is: dissolve 30 grams of ethylene-vinyl alcohol copolymer (in which the ethylene content is 38%) in 70 grams of N,N -In dimethylacetamide, seal and let it stand for 6 hours to defoam, at an ambient temperature of 18.1°C and a humidity of 55%, scrape the obtained homogeneous casting solution on a glass plate with a 200 μm scraper to form a nascent film, and quickly immerse Solidified into a film in a gel bath at 1.5°C, washed with water, and the...

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Abstract

The invention discloses a method for separating and enriching lithium isotopes by utilizing membrane extraction. The method comprises the following steps of extracting and separating by adopting a membrane, wherein the material liquid phase and the extraction phase respectively flow at two sides of the membrane, the material liquid phase is an aqueous solution containing lithium isotopes 6Li and 7Li, and the extraction phase is an organic phase, and contains an extraction agent with an enriching effect to 6Li or 7Li, and enriching the lithium isotopes in the material liquid phase by a membrane component. After the lithium isotopes are enriched by the extraction phase, the enriched lithium isotopes enter the water phase via reverse extraction. The lithium isotopes are separated and enriched by adopting a membrane extraction method; the method is a simple, efficient and low-energy-consumption technological method, and has the advantages of small occupied area, running stability, easiness in scale expansion and the like.

Description

technical field [0001] The invention belongs to the technical field of isotope separation and enrichment, and in particular relates to a method and device for lithium isotope separation and enrichment by membrane extraction. Background technique [0002] Lithium, as an emerging energy metal, is known as industrial MSG and has two stable isotopes, 6Li and 7Li, whose natural abundances in nature are about 7.5% and 92.5%, respectively. [0003] 6Li and 7Li play an extremely important role in nuclear reactions. 6Li is an essential fuel for nuclear fusion reactors. After neutron bombardment of 6Li, tritium and helium are generated, which makes the tritium in the fusion reactor continuously proliferate, produces a strong thermonuclear reaction, and releases a large amount of Therefore, 6Li, as an ideal nuclear fuel in nuclear reactors, plays a very important role in nuclear power generation and hydrogen bomb production. The Argone National Laboratory in the United States estimate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D59/22
Inventor 何涛宋健峰陈光华张冉赵宝龙孔丁峰殷勇王周为李雪梅邢利欣田苗苗刘仁啸朱军勇张蒙晰
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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