Thorium-containing fluoride fused salt and/or uranium-containing fluoride fused salt and preparation method

A fluoride and molten salt technology, which is applied in the fields of reactor fuel material, nuclear power generation, climate sustainability, etc., can solve the problem that thorium and/or uranium elements cannot be uniformly distributed in fluoride molten salt, etc., and achieves a simple and easy-to-operate preparation method. , the effect of not easy to reunite

Active Publication Date: 2017-05-10
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the defect that thorium and/or uranium elements cannot be evenly distributed in fluo

Method used

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  • Thorium-containing fluoride fused salt and/or uranium-containing fluoride fused salt and preparation method
  • Thorium-containing fluoride fused salt and/or uranium-containing fluoride fused salt and preparation method
  • Thorium-containing fluoride fused salt and/or uranium-containing fluoride fused salt and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Example

[0030] Examples 1~6

[0031] The products prepared in Examples 1 to 6 are all FLiNaKU molten salts, and the difference lies only in UF 4 The addition amount is different, the UF in Examples 1~6 4 The addition amount is shown in Table 1.

[0032] Table 1

[0033]

[0034] Note: UF 4 The percentages in the added amount are all relative to the total mass of LiF, NaF and KF; the percentages in the theoretical content of U are all relative to the total mass of the sample.

[0035] The preparation methods of FLiNaKU molten salt in Examples 1 to 6 all include the following steps:

[0036] Using the ball mill crushing and mixing method, weigh 15g of the three fluorides LiF, NaF and KF according to the mass ratio of 29.3:11.7:59 and mix them into the ball mill. After grinding for 3 hours, the particle size is 0.2~1μm; 1 medium UF 4 The raw materials were put into a ball mill respectively. After being ground by the ball mill for 3 hours, the particle size was about 0.2~1μm. The materials were ta...

Example

[0039] Examples 7-12

[0040] The products prepared in Examples 7-12 are all FLiNaKTh molten salts, and the difference lies only in ThF 4 The amount of addition is different, ThF in Examples 7-12 4 The addition amount is shown in Table 2.

[0041] Table 2

[0042]

[0043] Note: ThF 4 The percentages in the added amount are all mass percentages relative to the total amount of LiF, NaF and KF; the percentages in the theoretical content of Th are all mass percentages relative to the total sample amount.

[0044] Compared with the preparation method of FLiNaKTh molten salt in Examples 7-12, except for UF 4 Replace with ThF 4 Otherwise, the rest of the operations or conditions are the same as in Examples 1-6.

Example

[0045] Examples 13-16

[0046] The products prepared in Examples 13-16 are all mixed homogeneous molten salts containing Th and U, and the difference lies only in UF 4 And ThF 4 The addition amount is different, UF in Examples 13-16 4 And ThF 4 The addition amount is shown in Table 3.

[0047] table 3

[0048]

[0049]

[0050] Note: UF 4 And ThF 4 The percentages in the added amount of are all relative to the total mass of LiF, NaF and KF; the percentages in the theoretical content of Th and U are all relative to the total mass of the sample.

[0051] The preparation methods of molten salt in Examples 13-16 are compared with Examples 1-6, except for UF 4 Replace with UF 4 And ThF 4 Except for the mixture, other operations or conditions are the same as those in Examples 1 to 6.

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Abstract

The invention discloses thorium-containing fluoride fused salt and/or uranium-containing fluoride fused salt and a preparation method. The preparation method includes following steps: in an inert or vacuum atmosphere, heating a mixture of substances A and B to be in a fused state, wherein the substance A is thorium tetrafluoride and/or uranium tetrafluoride, using amount of the substance A is 0.1-80%, and the percentage is mass percentage of the substance A accounting for the substance B; density of the substance B is fluoride fused salt of 1-4g/cm3; grain size of the substances A and B in the mixture is 0.2um-2mm respectively. The preparation method is simple and easy to operate and suitable for large-scale production; components of the thorium-containing fluoride fused salt and/or uranium-containing fluoride fused salt are free of layering and segregation; the thorium-containing fluoride fused salt and/or uranium-containing fluoride fused salt after being quenched is a homogeneous system and can be used as a fused salt standard sample in quantitative analysis.

Description

technical field [0001] The invention specifically relates to a thorium-containing fluoride molten salt and / or a uranium-containing fluoride molten salt and a preparation method thereof. Background technique [0002] Molten salt refers to the molten body formed after the salt is melted or the solid after the molten body is cooled. Generally, molten salt is called a melt in a high temperature state, and a solid solution in a solidified state at a low temperature. [0003] As far as element quantitative analysis is concerned, the existing technology is mainly based on the determination of element content in aqueous solution. The sample to be tested needs to be diluted dozens of times or even thousands of times before determining the element content, and standard samples are required to formulate a standard working curve. The advantages of aqueous phase quantification The distribution of elements in the sample is uniform. When quantitatively analyzing the elements in the solid...

Claims

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Application Information

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IPC IPC(8): G21C3/54G21C17/104
CPCG21C3/54G21C17/104Y02E30/30
Inventor 王建东张国欣耿俊霞
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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