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Extraction separation device and extraction separation method for lithium isotopes

A lithium isotope and separation method technology, applied in the field of lithium isotope separation, can solve the problems of complex operation, low extraction separation and enrichment effect, extraction agent dissolution and entrainment loss, etc., to achieve improved cycle performance, good separation and enrichment effect, The effect of increasing abundance

Pending Publication Date: 2021-03-19
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

The current solvent extraction method uses a liquid-liquid contact method of violent oscillation for extraction and exchange. Not only is the extraction, separation and enrichment effect not high, but also centrifugation is required for phase separation. The operation is complicated and there are serious extraction agent dissolution and entrainment losses.

Method used

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  • Extraction separation device and extraction separation method for lithium isotopes

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The liquid gun was removed from the liquid gun (0.2 mol / L 4-Br-B15C5, the ionic liquid was 1-butyl-3-imidazole double trifluoromethane sulfonic salt ([BIM] [NTF 2 ]), Benzyl ether is an organic solvent, a volume ratio of ionic liquid and benzoether having a volume ratio of 1: 19) and 8 ml of water phase (2 mol / L iodide) to the reaction vessel, the experimental temperature is 15 ° C, access The inert gas is nitrogen and the venting flow rate is 20 ml / min, and the ventilation time is 60 min. After the reaction is completed, the extraction after the extraction is transferred to a new container, and 3 ml of 1 mol / L of HCl solution was subjected to substrate washing, and the reverse washing step was repeated. The anti-extract can reach 99%. Water samples for lithium isotope rich test, measure δ 7 Li (‰) = - 27.47 ‰, ie after separation and enrichment 6 Li's abundance reached 7.831%.

Embodiment 2

[0055] The liquid gun was removed from the liquid gun (0.2 mol / L 4-Br-B15C5, the ionic liquid was 1-butyl-3-imidazole double trifluoromethane sulfonic salt ([BIM] [NTF 2 ]), Benzyl ether is an organic solvent, a volume ratio of ionic liquid and benzoether having a volume ratio of 1: 15) and 6 mL of aqueous phase (2 mol / L lithium chloride) to the reaction vessel, the experimental temperature is 15 ° C, access Inert gas nitrogen, with a ventilation flow rate of 15 ml / min, and a ventilation time is 80 min. After the reaction is completed, the extraction after the extraction is transferred to a new container, and 3 ml of 1 mol / L of HCl solution was subjected to substrate washing, and the reverse washing step was repeated. The anti-extract can reach 99%. Water samples for lithium isotope rich test, measure δ 7 Li (‰) = - 21.88 ‰, ie after a single separation 6 Li's abundance reached 7.790%.

Embodiment 3

[0057] Milled guns were removed from the organic phase (0.3 mol / L 4-Br-B15C5, the ionic liquid was 1-butyl-3-imidazole double trifluoromethane sulfonamide salt ([BIM] [NTF 2 ]), Benzyl ether is an organic solvent, a volume ratio of ionic liquid and benzoether having a volume ratio of 1: 9) and 6 mL (4 mol / L iodide) to the reaction vessel, the experimental temperature is 5 ° C, access The inert gas is nitrogen, with a ventilation flow rate of 20 ml / min, and the ventilation time is 80 min. After completion of the reaction, the extracted organic phase was transferred to a new container, and 3 ml of 2 mol / L of HCl solution was subjected to subtracking, repeated reverse washing step 3 times, and the anti-extract can reach 99%. Water samples for lithium isotope rich test, measure δ 7 Li (‰) = - 37.45 ‰, ie after a single separation 6 Li's abundance reached 7.906%.

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Abstract

The invention discloses an extraction separation device for lithium isotopes. The device comprises an extraction reaction container, temperature control equipment and gas blowing-in equipment; the extraction reaction container comprises a first cavity and a second cavity surrounding the peripheral side surface of the first cavity; the temperature control equipment is connected with the second cavity through a guide pipe and used for providing temperature control liquid and enabling the temperature control liquid to circulate between the second cavity and the temperature control equipment; anda guide pipe is connected with the bottom of the first cavity through the gas blowing-in equipment and is used for providing gas and blowing the gas into the first cavity through a gas distribution plate. The invention further discloses an extraction separation method for the lithium isotopes, the extraction separation device is applied, gas is introduced during extraction, and the extraction temperature is controlled. According to the extraction separation device and the separation method for the lithium isotopes, the abundance of 6Li single-stage separation can be effectively improved.

Description

Technical field [0001] The present invention belongs to the field of lithium isotopic separation technology, and more particularly to an extraction separation apparatus and an extraction separation method of a lithium group. Background technique [0002] Lithium (Li) has two stable isotope in nature 6 Li and 7 Li, their natural abundance (referring to 6 Li and 7 The natural relative percentage of Li is 7.42% and 92.58%, respectively, which has an extremely important role in nuclear energy fields. Among them, the heat neutron absorbs 940b 6 Li is bombarded by neutron (N) after shelling fissure, she can produce gentle and helium ( 6 Li + N → T + 4 HE), so a certain abundance 6 Li can be used as a nuclear figures and other uses; the hot neutron absorption section is only 0.037B 7 Li has an important role in the regulation of nuclear reaction processes and the maintenance of equipment. Nuclear fusion supply is used to polymerize 氦 (d) and (T) ( 4 HE) The huge energy that is now relea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D59/24
CPCB01D59/24
Inventor 贾永忠刘兵姚颖景燕孙化鑫张泽正张鹏瑞张全有邵斐
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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