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A liquid-liquid extraction process for separating lithium isotopes

A lithium isotope and process technology, applied in the separation of different isotopic elements, separation methods, separation of dispersed particles, etc., can solve problems such as mercury volatile loss, large amounts of mercury, and environmental hazards around operators

Active Publication Date: 2020-03-10
SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process requires a large amount of mercury, and mercury is volatile and lost, causing serious harm to operators and the surrounding environment
Chinese patent 201310239535X reports a process for producing lithium-7 isotope, which can obtain high-abundance lithium-7 isotope products, but the extraction process requires precise control of the fluctuation range of liquid flow and the concentration of materials

Method used

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  • A liquid-liquid extraction process for separating lithium isotopes
  • A liquid-liquid extraction process for separating lithium isotopes
  • A liquid-liquid extraction process for separating lithium isotopes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] Connect the pipelines according to the process diagram, and a total of 20 centrifugal extractors are used in the extraction and separation C1 section and the extraction and separation C2 section. Buffer H1 section contains the first liquid storage tank with a volume of 0.018m 3 ;The buffer H2 section contains the second liquid storage tank with a volume of 0.001m 3 .

[0104] Organic phase: Contains 7-trifluoromethyl-10-hydroxybenzoquinoline, and co-extractant and diluent.

[0105] Phase inversion liquid aqueous phase (A1): NaCl aqueous solution.

[0106] Conditioning solution (T): Sodium hydroxide aqueous solution.

[0107] Lithium-containing liquid (F): Li 2 SO 4 Aqueous solution, 1.8mol / L, in which the abundance of lithium-6 is 7.49%, and the abundance of lithium-7 is 92.51%.

[0108] The organic phase and each aqueous phase are added through the feeding pump, and the entire extraction process is run. After 156 hours, the system reaches equilibrium, and continu...

Embodiment 2

[0111] The technical process and the feed liquid all adopt the parameters in Example 1, and only change the volume of the first liquid storage tank in the buffer H1 section to 0.040m 3 . Can be continuously separated to obtain enrichment products different from the abundance values ​​in Example 1:

[0112] The lithium-6 abundance value of the lithium-6 enrichment product (P1) is 8.03%, and the stage efficiency of the extraction and separation C1 section is 94%; the lithium-7 abundance value of the lithium-7 enrichment product (P2) is 93.90 %, the stage efficiency of the extraction and separation C2 section is 95%.

Embodiment 3

[0114] Connect the pipelines according to the process diagram, use 45 centrifugal extractors for the extraction and separation C1 section, and 160 centrifugal extractors for the extraction and separation C2 section. Buffer H1 section and buffer H2 section contain liquid storage tanks.

[0115] Organic phase: Contains 10-hydroxybenzoquinoline.

[0116] Phase inversion liquid water phase (A1): Na 2 SO 4 aqueous solution.

[0117] Conditioning solution (T): Potassium hydroxide aqueous solution.

[0118] Lithium-containing liquid (F): Li 2 SO 4 Aqueous solution, 2.5mol / L, in which the abundance of lithium-6 is 7.49%, and the abundance of lithium-7 is 92.51%.

[0119] The organic phase and each aqueous phase are added through the feeding pump, and the entire extraction process is run. After the system reaches equilibrium, continuous separation and two enriched products are obtained at the same time:

[0120] The lithium-6 abundance value of the lithium-6 enrichment product (...

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Abstract

The invention provides a technology for separating lithium isotope through liquid-liquid extraction. Specifically, the technology comprises the steps: continuously performing countercurrent operationon an organic phase and a water phase; making a lithium-containing organic phase passing through a lithium saponification section sequentially pass through an extraction separation C1 section, an extraction separation C2 section and a phase inversion section; making a lithium-containing water phase passing through the phase inversion section sequentially pass through a buffer H2 section, an extraction separation C2 section, an extraction separation C1 section and a buffer H1 section. By means of the buffer H1 section and the buffer H2 section, abundances of a lithium-6 enrichment product P1 and a lithium-7 enrichment product P2 can be conveniently regulated, and two enrichment products to which lithium-6 and lithium-7 are enriched can be obtained simultaneously. The technology disclosed bythe invention has a reasonable concise process design and convenient in operation, can effectively buffer and control flow fluctuation and achieves high-efficiency separation and enrichment of the lithium isotope.

Description

technical field [0001] The invention relates to isotope separation in the chemical industry, in particular to a process for liquid-liquid extraction and separation of lithium isotopes. Background technique [0002] Lithium (Li) has two natural isotopes in nature, namely 7 Li (lithium-7) and 6 Li (lithium-6) accounts for 92.48% and 7.52% respectively. These two isotopes have important different uses in the field of nuclear materials after separation, enrichment and concentration. In a thorium-based molten salt reactor, 7 Li is an essential molten salt coolant due to 6 The thermal neutron absorption cross section of Li is very high, reaching 941barns, while 7 Li is only 0.033barns, so the molten salt reactor is 7 The isotopic abundance of Li is required to be >99.995%. At the same time, high-purity 7 Li is often used to adjust the pH value of the primary coolant in pressurized water reactors, and in fusion reactors 7 Li is also used as a heat transfer agent for hea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D59/24
CPCB01D59/24
Inventor 胡金波张伟徐永昌顾洪熙
Owner SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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