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Purification method of nuclear pure lithium fluoride

A pure lithium fluoride, purification method technology, applied in the direction of lithium halide, etc., can solve the problem of difficult removal of metal impurities, complex operation, etc., achieve good purification effect and economic applicability, simple equipment, simple operation effect

Active Publication Date: 2021-06-01
SHANGHAI INST OF ORGANIC CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a purification method for nuclear pure lithium fluoride in order to overcome the defect that the metal impurities in nuclear pure lithium fluoride-7 are difficult to remove or the operation is complicated in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050]After the reactor is intact, the fluoride-pyridine complex is 50 kg to the reaction kettle, and the addition of the exit opening is added to the reactant.7LIF raw materials 10.0 kg (purity 99.9%, Fe: 550 ppm, Cr: 56 ppm, Ni: 35 ppm), stirring at room temperature for 1 h to completely dissolve, then warmed to 80 ° C for 1 h; will dissolve complete7LIF mixed solution is filtered in a filter tank (PTFE material, filter aperture 20 μm), and filtrate is to be used. The above filtrate was poured into the reactor and warmed to 80 ° C. Under the heat preservation, 4 times deionized water is gradually added from the high trough to 200 kg, precipitation7LIF products; after the holding is stirred for 1 hour, the heat is filtered in the filter tank. The filtrate is collected into a ton bucket, after filter drying, extracting the deionized water 10 kg each 10 kg, remove the acid and salt impurities of the surface; after the washing is completed, it is vacuum to dry 9.1 kg. Sampling analysi...

Embodiment 2

[0052]After the reactor is intact, the vacuum extracts N, N-dimethylformamide hydrogenated hydrogen complex 35 kg to the reaction kettle, under stirring, add to the addition to purify7LIF raw materials 10.0 kg (purity 99.9%, Fe: 550 ppm, Cr: 56 ppm, Ni: 35 ppm), stirring at room temperature for 1 h to completely dissolve, then warmed to 80 ° C for 1 h; will dissolve complete7LIF mixed solution is filtered in a filter tank (PTFE material, filter aperture 20 μm), and filtrate is to be used. The above filtrate was poured into the reactor and warmed to 80 ° C. Under the incubation, 6 times deionized water is gradually added from the high trough 210 kg, precipitation7LIF products; after the holding is stirred for 1 hour, the heat is filtered in the filter tank. The filtrate is collected into a ton bucket within a ton bucket; after filtering, extrapolate is washed three times each 10 kg, remove the acid and salt impurities of the surface; after the washing is completed, it is vacuum to ob...

Embodiment 3

[0054]After the reactor is intact, the vacuum extracts the triethylamine trifluoride complex 40 kg to the reactor, and under stirring conditions, add to the addition to purify it.7LIF raw materials 10.0 kg (purity 99.9%, Fe: 550 ppm, Cr: 56 ppm, Ni: 35 ppm), stirring at room temperature for 1 h to completely dissolve, then warmed to 80 ° C for 1 h; will dissolve complete7LIF mixed solution is filtered in a filter tank (PTFE material, filter aperture 20 μm), and filtrate is to be used. The above filtrate was poured into the reactor and warmed to 80 ° C. Under the incubation, 6 times deionized water is gradually added from the high trough 240 kg, precipitation7LIF products; after the holding is stirred for 1 hour, the heat is filtered in the filter tank. The filtrate is collected into a ton bucket, after filter drying, extracting the deionized water 10 kilograms per 10 kg, remove the acid and salt impurities of the surface; after the washing is completed, the product is 9.3 kg. Sampli...

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PUM

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Abstract

The invention discloses a purification method of nuclear pure lithium fluoride. The method comprises the following steps: (1) mixing a lithium fluoride raw material with an organic solvent-hydrogen fluoride complex for complete dissolving to obtain a liquid A, wherein the mixing temperature is 40-100 DEG C; and (2) carrying out solid-liquid separation on a mixture of the liquid A and water in the step (1), and taking a solid. According to the purification method, the metal impurities in the purified lithium fluoride can meet the quality allowable index requirement of the molten salt reactor on the initial raw material fluoride salt, meanwhile, the product yield of the purified lithium fluoride is high (the mass loss is smaller than 10%), the purity can reach 99.97% or above, and equipment adopted by the method is simple, easy to operate, low in cost, free from pollution, high in safety and low in energy consumption.

Description

Technical field[0001]The present invention relates to a purified method for nuclear pure fluoride.Background technique[0002]The molten salt heap (MSR) is one of the six candidate nuclear energy systems selected in the "4th Generation International Forum" (GIF). Compared with other stacks, it has an unparalleled advantage in neutron economics, radioactive waste treatment, inherent safety and anti-nuclear proliferation. Since the fluoride molten salt has a series of characteristics such as a small absorption cross section, good high temperature stability, high thermal conductivity, high-dimensional heat, high boiling point, low saturated vapor pressure, and viscosity, MSR selects fluoride of alkaline earth metal as a nuclear fuel carrier and Coolant, where binary mixture7LIF-BEF2For the most common candidate melting salt system. Application to MSR7LIF-BEF2Molten salts have very high requirements for purity, and some corrosive metal impurities have very strict limitations in molten sal...

Claims

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Application Information

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IPC IPC(8): C01D15/04
CPCC01D15/04C01P2006/80
Inventor 肖吉昌宗国强王荣荣陆人杰
Owner SHANGHAI INST OF ORGANIC CHEMISTRY - CHINESE ACAD OF SCI