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Lithium isotope extraction separation method based on multi-stage oscillation

A lithium isotope and separation method technology, applied in the field of lithium isotope extraction and separation, can solve the problems of complex operation, low lithium isotope abundance, and high raw material cost, and achieve the effects of low material cost, increased abundance, and simple operation process

Pending Publication Date: 2020-12-11
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

In this method, the extraction liquid needs to be used for repeated multi-stage extraction, and there are problems such as complicated operation and high cost of raw materials, and the abundance of lithium isotopes is still small after multi-stage stacking extraction and separation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The extraction and separation method of lithium isotopes provided in this embodiment is specifically the extraction and separation method of lithium isotopes based on three-stage oscillation, which includes the following steps:

[0052] 1. Preparation of the organic extraction phase: the extraction agent dibenzo-15-crown-5 was dissolved in the organic solvent chloroform to obtain an organic extraction phase with an extraction agent concentration of 0.2 mol / L.

[0053] It should be noted that in this embodiment, the extractant is selected to be benzo-15-crown-5, that is, the compound of the aforementioned formula 2, and the diluent is selected to be chloroform.

[0054] Second, the preparation of lithium salt solution phase: the lithium salt Li[NTf 2 ] dissolved in water to prepare a lithium salt solution phase with a concentration of 1mol / L. Among them, Li[NTf before separation 2 ] solution 6 The abundance of Li is 7.51%.

[0055] 3. Prepare 0.6mol / L H 2 SO 4 The ...

Embodiment 2

[0066] The extraction and separation method of lithium isotopes provided in this embodiment is specifically the extraction and separation method of lithium isotopes based on five-stage oscillation, which includes the following steps:

[0067] 1. Preparation of the organic extraction phase: the extraction agent 4-aminobenzo-15-crown 5 was dissolved in the organic solvent dichloromethane to obtain an organic extraction phase with an extraction agent concentration of 0.4 mol / L.

[0068] It should be noted that in this embodiment, the extractant is selected to be 4-aminobenzo-15-crown 5, that is, the compound of the aforementioned formula 1, and the diluent is selected to be dichloromethane.

[0069] Second, the preparation of lithium salt solution phase: the lithium salt Li[NTf 2 ] dissolved in water to prepare a lithium salt solution phase with a concentration of 2mol / L. Among them, Li[NTf before separation 2 ] solution 6 The abundance of Li is 7.51%.

[0070] 3. Prepare 0.5...

Embodiment 3

[0087]The extraction and separation method of lithium isotopes provided in this embodiment is specifically the extraction and separation method of lithium isotopes based on sixteen-stage oscillation, which includes the following steps:

[0088] 1. Preparation of the organic extraction phase: the extraction agent benzo-15-crown 5 was dissolved in the organic solvent 1,1,2-trichloroethane to obtain an organic extraction phase with an extraction agent concentration of 0.6 mol / L.

[0089] It should be noted that, in this embodiment, the extractant is selected to be benzo-15-crown 5, that is, the compound of the aforementioned formula 1, and the diluent is selected to be 1,1,2-trichloroethane.

[0090] Second, the preparation of lithium salt solution phase: the lithium salt Li[NTf 2 ] dissolved in water to prepare a lithium salt solution phase with a concentration of 3mol / L. Among them, Li[NTf before separation 2 ] solution 6 The abundance of Li is 7.51%.

[0091] 3. Prepare 0....

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Abstract

The invention discloses a lithium isotope extraction separation method based on multi-stage oscillation. The method comprises the following steps: S1, preparing to obtain an organic extraction phase;S2, preparing to obtain a lithium salt solution phase; S3, preparing m parts of an exchange liquid; S4, mixing an organic extraction phase and the lithium salt solution phase, putting a mixture into acentrifugal device, and performing oscillation extraction in oscillation equipment to obtain an extraction enriched solution; S5, mixing the extraction enriched solution and a first part of exchangeliquid, putting a mixed solution into the centrifugal device, and performing oscillation exchange in the oscillation equipment to obtain a first exchange enriched liquid; S6, mixing the first exchangeenriched liquid and a second part of exchange liquid, putting a mix product into the centrifugal device, and performing oscillation exchange in the oscillation equipment to obtain a second exchange enriched liquid; S7, repeating the step S6 until the m exchange liquid and the (m-1) exchange enriched liquid are subjected to finished oscillation exchange to obtain the m exchange enriched liquids enriched with 6Li; wherein m is an integer greater than 2. According to the extraction separation method of the lithium isotope, provided by the invention, the separation and enrichment abundance of 6Li can be effectively improved.

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 based on multistage oscillation. Background technique [0002] Lithium (Li) exists in two stable isotopes in nature 6 Li and 7 Li, their natural abundance (referring to 6 Li and 7 The natural relative percentages of Li) are 7.42% and 92.58%, respectively, and these two isotopes play an extremely important role in the field of nuclear energy. Among them, the thermal neutron absorption cross section reaches 940b 6 After Li is bombarded and fissioned by neutrons (n), it can produce tritium and helium ( 6 Li+n→T+ 4 He), so a certain abundance 6 Li can be used as a raw material for nuclear fusion and other purposes; while the thermal neutron absorption cross section is only 0.037b 7 Li plays an important role in the regulation of nuclear reaction process and equipment maintenance. Nuclear fusion power supply is ...

Claims

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Application Information

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IPC IPC(8): B01D59/24
CPCB01D59/24
Inventor 姚颖张泽正贾永忠刘兵景燕张全有邵斐祁米香
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI