Preparation method for MOX fuel powder

By using tetravalent/hexavalent actinide nitrates and tetravalent/hexavalent actinide oxalates to form a mixed actinide eutectic with urea, combined with deammoniation, denitrification, and decarbonization treatments, the problems of high operational difficulty and large amount of waste liquid in MOX fuel powder preparation were solved, achieving efficient, economical, and green preparation of uniform MOX fuel powder.

WO2026025744A1 Publication Date: 2026-02-05CHINA INSTITUTE OF ATOMIC ENERGY
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Patent Information

Application Number
PCT/CN2024/135556
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-07-30
Filing Date
2024-11-29
Publication Date
2026-02-05

AI Technical Summary

Technical Problem

Existing MOX fuel powder preparation processes are characterized by high operational difficulty, demanding equipment requirements, long processes, and large amounts of waste liquid, with particular challenges in achieving uniform mixing and waste liquid treatment.

Method used

A mixed actinide eutectic is formed by combining tetravalent/hexavalent actinide nitrates and tetravalent/hexavalent actinide oxalates with urea. Through deammoniation, denitrification, and decarbonization treatments, the preparation process is simplified, achieving a uniform mixing of elemental composition from macroscopic to microscopic levels and avoiding the generation of waste liquid.

Benefits of technology

This method enables efficient, economical, and green preparation of MOX fuel powder, simplifies the process, reduces production costs, improves production efficiency, and yields completely uniform MOX fuel powder.

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Abstract

Provided in the embodiments of the present application is a preparation method for an MOX fuel powder. An MOX fuel powder comprises a plurality of actinide nuclide oxides. The method comprises the following steps: S1, mixing different actinide nuclide salts with urea to form a mixed actinide eutectic system, the actinide nuclide salts being one of hexavalent actinide nitrates, tetravalent actinide nitrates, hexavalent actinide oxalates and tetravalent actinide oxalates; S2, heating the mixed actinide eutectic system obtained in step S1 to a first preset temperature for performing deamination treatment on the mixed actinide eutectic system, so as to remove the urea therein; and S3, heating the product obtained after the deamination treatment in step S2 to a second preset temperature for performing denitrification and / or decarburization treatment on the product obtained in step S2, so as to obtain a plurality of actinide nuclide oxides. Provided in the embodiments of the present application is the preparation method for an MOX fuel powder, which is simple, does not produce a waste liquid, is more economical and environmentally friendly, and can obtain a completely uniform MOX fuel powder.
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