Shunting extraction process for separating lithium isotope

A lithium isotope and process technology, applied in the separation of different isotopic elements, separation methods, separation of dispersed particles, etc.

Active Publication Date: 2018-11-23
SHANGHAI INST OF ORGANIC CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Shunting extraction process for separating lithium isotope
  • Shunting extraction process for separating lithium isotope
  • Shunting extraction process for separating lithium isotope

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Embodiment 1

[0087] Connect the pipelines according to the process diagram. The first to 33 stages of the extraction and enrichment section adopt 33 SH-1 centrifugal extractors (rotating drum volume 0.15L), and the 34th to 68th stages adopt 35 SH-2 centrifugal extractors (rotating Drum volume 0.30L).

[0088] Lead out the split extraction section between the 33rd and 34th stages and enter the split extraction section liquid phase B Z1 The flow rate is the 34th exit B Z 45% of the flow, the remaining part of the liquid phase B Z2 Proceed to level 33. The split extraction section adopts 3 SH-1 type centrifugal extractors (rotating drum volume 0.15L).

[0089] Liquid phase A is the aqueous phase; liquid phase B is the organic phase, containing the extractant as 4-tert-butylbenzo15-crown-5, and the diluent as chloroform.

[0090] Lithium-containing material liquid (F): LiClO 4 Aqueous solution, 3.5mol / L, in which the abundance of lithium-6 is 7.49% and the abundance of lithium-7 is 92.51%.

[0091] T...

Embodiment 2

[0095] Connect the pipelines according to the process diagram. The first to 55th stages of the extraction and enrichment section use 55 SH-1 centrifugal extractors (rotating drum volume 0.15L), and the 56th to 100th stages use 45 SH-2 centrifugal extractors (rotating Drum volume 0.30L).

[0096] Lead out the split extraction section between the 55th and 56th stages, and enter the split extraction section liquid phase B Z1 The flow rate is the 46th exit B Z 52% of the flow, the remaining part of the liquid phase B Z2 Proceed to level 45. The split extraction section adopts 4 SH-1 type centrifugal extractors (rotating drum volume 0.15L).

[0097] Liquid phase A is an organic phase, containing 7-trifluoromethyl-10-hydroxybenzoquinoline, as well as a co-extractant and diluent; liquid phase B is an aqueous phase, which is an aqueous NaCl solution.

[0098] Lithium-containing material liquid (F): Li 2 SO 4 Aqueous solution, 1.5mol / L, in which the abundance of lithium-6 is 7.49% and the ab...

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Abstract

The invention provides a shunting extraction process for separating a lithium isotope. The shunting extraction process mainly comprises an extraction enrichment section, a shunting enrichment section,an up-conversion phase section and a down-conversion phase section, wherein a liquid phase B in the extraction enrichment section is partially shunted into the shunting enrichment section, and contacts with the countercurrent of a liquid phase A in the shunting enrichment section; the liquid phase A enters the extraction enrichment section after flowing out. By adopting the special shunting return process, the yield of a final enrichment product is not lowered, and the size of most equipment in the extraction enrichment section is reduced, thereby effectively lowering the corresponding equipment cost and operating cost. The process provided by the invention also has the advantages of simple process, convenience in operation, environmental friendliness and the like, and efficient separation and enrichment of the lithium isotope can be realized.

Description

Technical field [0001] The invention relates to isotope separation in the chemical industry, in particular to a split extraction process for separating lithium isotopes. Background technique [0002] There are two natural isotopes of lithium (Li) in nature, namely 7 Li (lithium-7) and 6 Li (lithium-6), accounting for 92.48% and 7.52% respectively. After separation, enrichment and concentration of these two isotopes, each has important and different uses in the field of nuclear materials. In the thorium-based molten salt pile, 7 Li is an essential molten salt coolant, due to 6 The thermal neutron absorption cross-section of Li is very high, reaching 941 barns, while 7 Li is only 0.033barns, so the molten salt pile 7 Li's isotope abundance requirements> 99.995%. At the same time, high purity 7 Li is often used to adjust the pH value of the primary coolant in a pressurized water reactor, in a fusion reactor 7 Li is also used as a heat carrier for heat conduction. on the other h...

Claims

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Application Information

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IPC IPC(8): B01D59/24
CPCB01D59/24
Inventor 胡金波张伟顾洪熙郑卫琴
Owner SHANGHAI INST OF ORGANIC CHEMISTRY - CHINESE ACAD OF SCI
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