Process for extracting and separating lithium isotopes by crown ether
A lithium isotope and extraction technology, applied in the chemical industry, can solve problems such as difficult multi-stage countercurrent and continuous production, no relatively mature production process, and multi-stage cascade extraction process has not yet been reported.
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[0079] Example 1
[0080] Connect the pipelines according to the process diagram. A total of 20 centrifugal extractors are used in the extraction separation section C1 and the extraction separation section C2. The buffer H1 section contains a liquid storage tank with a volume of 0.025m 3 ; The buffer H2 section contains a liquid storage tank with a volume of 0.002m 3 .
[0081] Organic phase: The extractant is dicyclohexyl 18-crown ether-6, the diluent is dichlorobenzene, and the organic phase single-stage extraction separation coefficient is 1.031.
[0082] Lithium-containing material solution (F): LiI aqueous solution, 2.5 mol / L, in which the abundance of lithium-6 is 7.48%, and the abundance of lithium-7 is 92.52%.
[0083] Through the feeding pump, the organic phase, the water phase and the material liquid are continuously added, and the entire extraction process is run. After 65 hours, the system reaches equilibrium, and continuous separation and enrichment products are obtained:...
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[0085] Example 2
[0086] The process flow and the material liquid adopt the parameters in Example 1, only the volume of the storage tank in the buffer H1 section is changed to 0.050m 3 . Enriched products with different abundance values in Example 1 can be continuously obtained:
[0087] The lithium-7 abundance value of the lithium-7 enriched product (P1) is 93.27%, and the extraction and separation efficiency of the C1 stage is 95%; the lithium-6 abundance value of the lithium-6 enriched product (P2) is 10.20% , The extraction separation efficiency of C1 stage is 95%.
Example Embodiment
[0088] Example 3
[0089] Connect the pipelines according to the process diagram. The extraction and separation section C1 uses 25 centrifugal extractors, and the extraction separation section C2 uses 55 centrifugal extractors. The buffer H1 section and the buffer H2 section contain a liquid storage tank and a temperature controller.
[0090] Organic phase: The extractant is 4-tert-butylbenzo15-crown-5, the diluent is kerosene, and the separation coefficient of the organic phase single-stage extraction is 1.032.
[0091] Lithium-containing material liquid (F): LiClO 4 Aqueous solution, 3.0mol / L, in which the abundance of lithium-6 is 7.49% and the abundance of lithium-7 is 92.51%.
[0092] Through the feeding pump, the organic phase, the water phase and the material liquid are continuously added, and the entire extraction process is run. After the system reaches equilibrium, the continuous separation and enrichment products are obtained:
[0093] The lithium-7 abundance value of the li...
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