Method for preparing nuclear-pure thorium tetrafluoride from thorium oxalate through purification

A technology for nuclear pure thorium tetrafluoride and oxalic acid, which is applied in the field of nuclear fuel raw material preparation, can solve the problems of difficulty in meeting the purity requirements of nuclear energy fuel and low purity of thorium compounds, and achieves the advantages of easy expansion of production capacity, satisfactory purification effect and reduction of radioactive pollution. Effect

Active Publication Date: 2017-05-10
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The purity of the thorium compound produced by this process method is relatively low (the main components are shown in Table 1), and it is difficult to meet the purity requirements of the special performance of nuclear energy fuel. It is necessary to prepare nuclear pure compounds that meet the requirements of nuclear fuel. Chemical elements with large cross-sections must be separated and further purified to produce compounds of the required purity

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  • Method for preparing nuclear-pure thorium tetrafluoride from thorium oxalate through purification
  • Method for preparing nuclear-pure thorium tetrafluoride from thorium oxalate through purification
  • Method for preparing nuclear-pure thorium tetrafluoride from thorium oxalate through purification

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Embodiment 1

[0026] A method for purifying and preparing nuclear pure thorium tetrafluoride from thorium oxalate according to the present invention comprises the following steps:

[0027] (1) Nitric acid dissolved after thorium oxalate alkali conversion

[0028] Weigh the thorium oxalate raw material and add water to make a slurry, add sodium hydroxide, the molar ratio of the thorium oxalate raw material to sodium hydroxide is 1:8, the temperature is 80°C, the holding time is 2 hours, the slurry is filtered to obtain the thorium hydroxide solid, and then Add nitric acid to the filtered solid for dissolution, the amount of nitric acid added is controlled at 4mol / L in the solution obtained after the dissolution reaction; then filter to obtain a thorium nitrate solution, and the concentration of thorium nitrate in the solution is 80g / L;

[0029] (2) Hydrogen peroxide reduces tetravalent cerium, low-concentration TBP extracts uranium and high-concentration TBP extracts thorium:

[0030] In st...

Embodiment 2

[0040] A method for purifying and preparing nuclear pure thorium tetrafluoride from thorium oxalate according to the present invention comprises the following steps:

[0041] (1) Nitric acid dissolved after thorium oxalate alkali conversion

[0042] Weigh the thorium oxalate raw material and add water to make a slurry, add sodium hydroxide, the molar ratio of the thorium oxalate raw material to sodium hydroxide is 1:4, the temperature is 60°C, the holding time is 5 hours, the slurry is filtered to obtain thorium hydroxide solid, and then Add nitric acid to the filtered solid to dissolve, and the amount of nitric acid added is controlled at 0.5mol / L in the solution obtained after the dissolution reaction; then filter to obtain a thorium nitrate solution, and the concentration of thorium nitrate in the solution is 90g / L;

[0043](2) Hydrogen peroxide reduces tetravalent cerium, low-concentration TBP extracts uranium and high-concentration TBP extracts thorium:

[0044] In step ...

Embodiment 3

[0051] A method for purifying and preparing nuclear pure thorium tetrafluoride from thorium oxalate according to the present invention comprises the following steps:

[0052] (1) Nitric acid dissolved after thorium oxalate alkali conversion

[0053] Weigh the thorium oxalate raw material and add water to make a slurry, add sodium hydroxide, the molar ratio of the thorium oxalate raw material to sodium hydroxide is 1:12, the temperature is 110°C, the holding time is 5 hours, the slurry is filtered to obtain thorium hydroxide solid, and then Add nitric acid to the filtered solid for dissolution, and the amount of nitric acid added is controlled at 5mol / L in the dissolved solution obtained after the dissolution reaction; then filter to obtain a thorium nitrate solution, and the concentration of thorium nitrate in the solution is 150g / L;

[0054] (2) Hydrogen peroxide reduces tetravalent cerium, low-concentration TBP extracts uranium and high-concentration TBP extracts thorium:

...

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Abstract

The invention provides a method for preparing nuclear-pure thorium tetrafluoride from thorium oxalate slag through purification. The method comprises the following steps: (1) dissolving thorium oxalate in nitric acid after alkali conversion; (2) reducing tetravalent cerium with hydrogen peroxide, extracting uranium with low concentration TBP and extracting thorium with high concentration TBP; (3) precipitating and dehydrating thorium tetrafluoride. The thorium tetrafluoride prepared and obtained by a set of technological method from conversion of thorium oxalate slag to extraction and preparation of thorium tetrafluoride in the invention meets standards of raw materials for a molten salt reactor, has the experimental transformation ability reaching the kilogram level, and has the production capacity easy to expand.

Description

technical field [0001] The invention belongs to the technical field of preparation of nuclear fuel raw materials, and in particular relates to a method for preparing nuclear pure thorium tetrafluoride through conversion, purification, and preparation of thorium oxalate slag with high impurity content produced during rare earth extraction as a raw material. Background technique [0002] Thorium is naturally radioactive, and thorium tetrafluoride can be produced by thermal reduction with metal calcium or magnesium, and metal thorium powder can also be obtained by molten salt electrolysis, and LiF, BeF 2 , UF 4 Such mixtures of salts can be used together in molten salt reactors. 232 Th captures a neutron and transforms into fission 233 U, 233 U is with 235 U and 239 Pu can also be used in reactors to generate large amounts of nuclear energy through fission chain reactions. The total amount of proven thorium dioxide in my country, which is rich in thorium resources, is abo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F15/00
CPCC01F15/00C01P2006/82
Inventor 李涛郭波龙张凡于晓闯于晓波盖石琨王昱人李雪云
Owner CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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