Extraction system for extracting lithium isotope

A lithium isotope and extraction technology, which is applied in the field of lithium isotope separation, can solve the problems of low distribution coefficient, unfavorable extraction and separation, and increased industrialization costs, and achieve the effect of low cost and strong adaptability to industrial operations

Active Publication Date: 2016-05-04
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The research on the separation of lithium isotopes by liquid-liquid extraction includes: Fang Shengqiang's "4-Methylbenzo-15-crown-5's ability to separate lithium isotopes" published in "Nuclear Chemistry and Radiation Chemistry" and "4-tert-butylbenzo -15-crown-5 liquid-liquid extraction method for the separation of lithium isotopes is involved, but its experimental data show that the distribution coefficients are very low (far less than 1), which means that its single-stage extraction efficiency will also be very small , not conducive to extraction and separation
[0005] Chinese patent

Method used

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  • Extraction system for extracting lithium isotope
  • Extraction system for extracting lithium isotope
  • Extraction system for extracting lithium isotope

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Embodiment Construction

[0018] In the following, the embodiments of the present invention will be described in detail.

[0019] The chemical exchange method separates lithium isotopes, and the isotope exchange reaction between the two liquid phases can be expressed as:

[0020]

[0021] Wherein, X and Y respectively represent the coordination environment of lithium ions in the two phases, as in the present invention, X represents the water phase, and Y represents the organic phase.

[0022] The single-stage extraction rate (E%) is the percentage of the lithium content entering the organic phase in one extraction process to the total amount of lithium ions in the two phases, and represents the completeness of the extraction. It varies with the experimental conditions (such as the concentration of the extract, the pH of the solution, the concentration of the extractant, the nature of the diluent, etc.).

[0023] E % = [ L ...

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Abstract

The invention provides an extraction system for extracting lithium isotope. The system comprises an extracting agent, a hydrophobic ionic liquid and a diluent. The hydrophobic ionic liquid and the diluent are in the volume ratio of 1-15:1-10; the extracting agent has concentration in an extraction organic phase of 0.05-2.5mol / L; the extracting agent is at least one of benzo-15-crown-5 and a derivative thereof, or benzo-14-crown-4 and a derivative thereof. Compared with the crown ethers and pure ionic liquid system of the prior art, the system has the advantages of low operating costs and strong industry adaptability.

Description

technical field [0001] The invention relates to the technical field of extraction and separation, especially the separation of lithium isotopes. Background technique [0002] At present, there are many separation methods for lithium isotopes at home and abroad, mainly including lithium amalgam method, extraction method, ion exchange chromatography, fractional crystallization and fractional precipitation, electromagnetic method, molten salt electrolysis, electron migration, molecular distillation and Laser separation, etc. So far, the only lithium amalgam method that can industrially produce and separate lithium isotopes in the world, and most other lithium isotope methods are only in the laboratory research stage. However, a large amount of mercury is used in the process of separating lithium isotopes by lithium amalgam method, which poses a serious threat to human beings and the environment, which greatly limits the prospect of lithium amalgam method as a source of lithium...

Claims

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Application Information

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IPC IPC(8): B01D59/24
CPCB01D59/24
Inventor 景燕肖江贾永忠姚颖孙进贺石成龙王兴权
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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