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
CN106629807AActive Publication Date: 2017-05-10CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
Publication Date
2017-05-10

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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.
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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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