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Preparation technology of UO2-graphene composite fuel

A graphene composite and preparation technology, which is applied in nuclear engineering, manufacturing reactors, reactors, etc., can solve the problems of uneven physical mixing, low fuel density in sintering process, and low production efficiency

Active Publication Date: 2017-11-10
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
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Problems solved by technology

[0005] To address existing UO 2 -In the preparation process of graphene composite fuel, there are problems such as uneven physical mixing, low production efficiency, high production cost and low fuel density in other sintering processes. The invention provides a UO 2 - Preparation process of graphene composite fuel

Method used

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preparation example Construction

[0038] The UO 2 -The preparation technology of graphene composite fuel pellet mainly comprises the following steps:

[0039] (1) Synthesis of UH 3 powder

[0040] Pass the metal uranium block into pure H in the hydrogenation furnace 2 Gas, at a temperature of 500-600°C, undergo 3-5 hydrogenation-dehydrogenation reactions, each reaction time is 30-50min, to obtain UH 3 powder.

[0041] (2) Synthesis of uranyl nitrate solution

[0042] Take concentrated nitric acid and UO respectively according to the molar ratio of 2 to 4:1 2 powder, the two are mixed and heated to a temperature of 50-70°C, and the reaction time is 1-3 hours to obtain a uranyl nitrate solution.

[0043] (3) Synthesis (NH 4 ) 2 u 2 o 7 -Graphene composite powder

[0044]The graphene powder, ammonia water and uranyl nitrate solution are respectively taken according to the molar ratio of 0.001-0.003:2-4:1. Add graphene into uranyl nitrate solution, and obtain a mixture solution through ultrasonic oscil...

Embodiment 1

[0054] This embodiment adopts the following steps to prepare UO 2 - Graphene composite fuel:

[0055] (1) Synthesis of UH 3 powder

[0056] Pass the metal uranium block into pure H in the hydrogenation furnace 2 Gas, at a temperature of 500°C, undergo three hydrogenation-dehydrogenation reactions, each reaction time is 30min, to obtain UH 3 powder.

[0057] (2) Synthesis of uranyl nitrate solution

[0058] Take concentrated nitric acid and UO respectively according to the molar ratio of 2:1 2 powder, the two are mixed and heated to 50°C, and the reaction time is 1h to obtain a uranyl nitrate solution.

[0059] (3) Synthesis (NH 4 ) 2 u 2 o 7 -Graphene composite powder

[0060] The graphene powder, ammonia water and uranyl nitrate solution were respectively taken according to the molar ratio of 0.001:2:1. Graphene was added to the uranyl nitrate solution, and the mixture solution was obtained through ultrasonic oscillation for 1 h; then ammonia water was slowly adde...

Embodiment 2

[0070] This embodiment adopts the following steps to prepare UO 2 - Graphene composite fuel:

[0071] (1) Synthesis of UH 3 powder

[0072] Pass the metal uranium block into pure H in the hydrogenation furnace 2 Gas, at a temperature of 550°C, undergo 4 hydrogenation-dehydrogenation reactions, each reaction time is 40min, to obtain UH 3 powder.

[0073] (2) Synthesis of uranyl nitrate solution

[0074] Take concentrated nitric acid and UO respectively according to the molar ratio of 3:1 2 powder, the two are mixed and heated to 60°C, and the reaction time is 2h to obtain a uranyl nitrate solution.

[0075] (3) Synthesis (NH 4 ) 2 u 2 o 7 -Graphene composite powder

[0076] The graphene powder, ammonia water and uranyl nitrate solution were respectively taken according to the molar ratio of 0.002:3:1. Graphene was added to the uranyl nitrate solution, and the mixture solution was obtained through ultrasonic oscillation for 2 h; then ammonia water was slowly added to...

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Abstract

The invention belongs to the field of preparation of nuclear reactor fuels, and provides a preparation technology of a UO2-graphene composite fuel pellet in order to solve the problems of uneven physical mixing, low production efficiency and high production cost existing in existing preparation technologies of a UO2-graphene composite fuel and low density of fuels prepared through other sintering technologies. The technology mainly comprises the following steps: 1, synthesizing UH3 powder; 2, synthesizing a uranyl nitrate solution; 3, synthesizing (NH4)2U2O7-graphene composite powder; 4, synthesizing UO2-graphene composite powder; 5, mixing the UO2-graphene composite powder with the UH3 powder; 6, carrying out cold press molding to form a green body of the fuel pellet; and 7, carrying out pressureless sintering to form the fuel pellet. The technology adopting a chemical method has the advantages of high production efficiency and low cost, and solves the problems of uneven elements and low density of the composite fuel, the relative density of the prepared composite fuel is about 95%, and the composite fuel has excellent thermophysical performances.

Description

technical field [0001] The invention belongs to the field of nuclear reactor fuel preparation, in particular to a UO 2 -Preparation process of graphene composite fuel. Background technique [0002] Graphene is an emerging two-dimensional nanomaterial. Studies have shown that it has excellent properties in many aspects and has a wide range of application values ​​in the field of materials. In the field of nuclear reactor fuel, the international power reactor UO 2 Fuel pellets doped with graphene to make UO 2 - Graphene composite fuel, using graphene's physical properties of high melting point, small thermal neutron absorption cross-section, and high thermal conductivity to improve the power reactor UO 2 Research on thermophysical properties of fuel pellets. In addition, the unique two-dimensional nanostructure of graphene makes it have good mechanical properties, which can be used for UO 2 play a role in diffusion strengthening. [0003] for UO 2 -Preparation of graphe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C21/02
CPCG21C21/02Y02E30/30
Inventor 吴学志尹邦跃
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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