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Preparation method of uranium nitride composite uranium dioxide fuel pellet

A technology of uranium nitride composite uranium dioxide and fuel pellets, which is applied in the field of preparation of uranium nitride composite fuel pellets, can solve the problems of prolonging the process cycle, increasing the difficulty of process operation, and easy oxidation, and achieves the effect of broad application prospects

Inactive Publication Date: 2021-06-22
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this process, since the prepared UN is extremely easy to oxidize, all processes need to be carried out in a glove box, which increases the difficulty of process operation and prolongs the process cycle.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0021] After cleaning the oxide layer of 1kg metal uranium sheet with nitric acid, soak it in alcohol to remove the residual impurities on the surface, dry it, put it in a hydrogenation dehydrogenation furnace, pass in 0.03~0.07MPa hydrogen gas, and hydrogenate it at 265~280℃ for 1~3 hours , heat up to 530-570°C for 3-5 hours for dehydrogenation, vacuumize and cool down to room temperature, repeat the above-mentioned hydrogenation-dehydrogenation process 3 times, and obtain metal uranium powder with a certain particle size;

[0022] Continue to feed 0.03-0.07MPa nitrogen gas into the hydrodehydrogenation furnace, raise the temperature of metal uranium powder to 450-500°C for nitriding for 6-10 hours, keep the positive pressure in the furnace and cool down to room temperature to obtain uranium-nitrogen compound;

[0023] Put the uranium-nitrogen compound into the Φ40mm steel mold in the glove box, wrap it with plastic film after the first pre-compression, take out the glove box ...

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PUM

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Abstract

The invention belongs to the technical field of preparation of uranium nitride composite fuel pellets, and particularly relates to a preparation method of a uranium nitride composite uranium dioxide fuel pellet. The preparation method comprises the steps of preparing metal uranium powder through cyclic hydrogenation dehydrogenation, and obtaining a uranium nitrogen compound through nitridation; pre-pressing a uranium nitrogen compound in a graphite mold, carrying out high-temperature denitrification on the mold and the uranium nitrogen compound in a tungsten-molybdenum sintering furnace to obtain a blocky UN material, and crushing and ball-milling the blocky UN material to prepare UN powder which can stably exist at room temperature; taking UN powder and 5-80 wt% of UO2 powder, and carrying out dry three-dimensional mixing or wet ball milling mixing with ethyl alcohol as a medium to obtain UN-UO2 mixed powder; and putting the UN-UO2 mixed powder into a graphite mold, and carrying out hot pressed sintering so as to prepare the solid UN-UO2 composite fuel pellet. The UN powder which can stably exist in the air is prepared, mixing of the UN powder and the UO2 powder in the atmospheric environment is achieved, the technological operation difficulty is lowered, and the technological period is shortened.

Description

technical field [0001] The invention belongs to the technical field of preparation of uranium nitride composite fuel pellets, and in particular relates to a preparation method of uranium nitride composite uranium dioxide fuel pellets. Background technique [0002] with UO 2 Compared with fuel pellets, UN pellets have higher uranium density and thermal conductivity, which can significantly improve the economic benefits of nuclear fuel. Since UN has poor water corrosion resistance, it will react with water when working in a reactor. In order to reduce its reaction Activity, a certain amount of UO can be added to UN 2 , currently the international community for UN-UO 2 The preparation method of the composite material is mainly to prepare UN powder by hydrogenation dehydrogenation and nitriding denitrification, adding a certain amount of UO 2 After powder mixing, hot pressing and sintering to prepare UN-UO 2 composite material. However, in this process, since the prepared U...

Claims

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Application Information

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IPC IPC(8): G21C21/02
CPCG21C21/02Y02E30/30
Inventor 李宗书何勇刘文涛郝若彤乔伟杜江平梁方知
Owner CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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