Method for preparing uranium carbide ceramic microspheres by taking carbon nanotubes as carbon source

A technology of carbon nanotubes and ceramic microspheres, applied in the field of nuclear engineering, can solve problems such as proportional effects

Active Publication Date: 2021-02-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because compounds such as urea and hexamethylenetetramine are used in the inner gel method, it is necessary to wash off the above-mentioned compounds remaining in the gel ball with ammonia water after the gel ball is prepared, but when using ammonia water for washing, it is easy to remove Part of the carbon source in the gel ball is washed away, so that when the carbon and uranium in the gel ball react, the ratio of the two is affected

Method used

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  • Method for preparing uranium carbide ceramic microspheres by taking carbon nanotubes as carbon source

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Embodiment 1

[0042]A method for preparing uranium carbide ceramic microspheres using carbon nanotubes as a carbon source, comprising the following steps:

[0043] (1) At room temperature, add 5.522g of hexamethylenetetramine and 2.366g of urea into 10ml of carbon nanotube aqueous dispersion (containing 1g of carbon nanotube) to fully dissolve to make a carbon-containing solution, and carbon-containing The solution is cooled in a constant temperature water bath at 4°C to form the first mixed solution;

[0044] (2) Take 10ml of 2.8mol / L under-acid uranyl nitrate solution, place it in a constant temperature water bath at 4°C for cooling, and form the second mixed solution;

[0045] (3) Pour the second mixed solution into the first mixed solution to form a mixed glue, so that the molar ratio of carbon atoms and uranium atoms in the mixed glue is 3:1, and place it in a constant temperature water bath at 4°C for cooling, Constitute the third mixed solution, the third mixed solution can be used ...

Embodiment 2

[0052] A method for preparing uranium carbide ceramic microspheres using carbon nanotubes as a carbon source, comprising the following steps:

[0053] (1) At room temperature, add 5.405g of hexamethylenetetramine and 2.356g of urea into 10ml of carbon nanotube aqueous dispersion (containing 1g of carbon nanotube) to fully dissolve to make a carbon-containing solution, and carbon-containing The solution is cooled in a constant temperature water bath at 4°C to form the first mixed solution;

[0054] (2) Take 10ml of 2.8mol / L under-acid uranyl nitrate solution, place it in a constant temperature water bath at 4°C for cooling, and form the second mixed solution;

[0055] (3) Pour the second mixed solution into the first mixed solution to form a mixed glue, so that the molar ratio of carbon atoms and uranium atoms in the mixed glue is 2.90:1, and place it in a constant temperature water bath at 4°C for cooling, Constitute the third mixed solution, the third mixed solution can be u...

Embodiment 3

[0062] A method for preparing uranium carbide ceramic microspheres using carbon nanotubes as a carbon source, comprising the following steps:

[0063] (1) At room temperature, add 5.522g of hexamethylenetetramine and 2.366g of urea into 10ml of carbon nanotube aqueous dispersion (containing 1g of carbon nanotube) to fully dissolve to make a carbon-containing solution, and carbon-containing The solution is cooled in a constant temperature water bath at 4°C to form the first mixed solution;

[0064] (2) Take 10ml of 2.8mol / L under-acid uranyl nitrate solution, place it in a constant temperature water bath at 4°C for cooling, and form the second mixed solution;

[0065] (3) Pour the second mixed solution into the first mixed solution to form a mixed glue, so that the molar ratio of carbon atoms and uranium atoms in the mixed glue is 3.15:1, and place it in a constant temperature water bath at 4°C for cooling, Constitute the third mixed solution, the third mixed solution can be u...

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Abstract

The embodiment of the invention relates to a method for preparing uranium carbide ceramic microspheres by using carbon nanotubes as a carbon source, which comprises the following steps: mixing a carbon nanotube dispersion liquid, an acid-deficient uranyl nitrate solution, hexamethylenetetramine and urea, and preparing gel spheres by an internal gel method; aging, washing and drying the gel spheres; and calcining the dried spheres, carrying out carbon thermal reduction and sintering. The washing liquid during washing comprises ammonia water. According to the embodiment of the invention, the carbon source in the process of preparing the uranium carbide ceramic microspheres by an internal gel method is optimized, and after the inventor tries to use various carbon-containing substances, the inventor finds that the carbon-containing substances cannot be washed away by ammonia water when the gel spheres prepared by using the carbon nanotubes as the carbon source are washed after being aged in hot silicone oil, and an ammonia water washing solution is kept clear; and the mixing ratio of carbon to uranium during carbothermic reduction is effectively ensured.

Description

technical field [0001] The invention relates to the field of nuclear engineering, in particular to a method for preparing uranium carbide ceramic microspheres by using carbon nanotubes as carbon sources. Background technique [0002] Fuel elements are the core components of nuclear reactors, and many types of nuclear reactor fuel elements use thousands of coated fuel particles in the fuel region. At present, most fuel elements based on triple structure isotropic (TRISO) coated fuel particles use uranium dioxide as the fuel core. If uranium carbide is used as the fuel core, the thermal conductivity is higher and the uranium density is also increased. When preparing uranium carbide, due to the presence of UC and U in uranium carbide fuel 2 C 3 and UC 2 Three different phase structures, an inappropriate ratio of uranium atoms to carbon atoms can lead to impurity phases (U 2 C 3 or UC 2 ), and the existence of different phases will cause the performance of the coated fuel...

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 马景陶房勇汉郝少昌李建军赵兴宇邓长生刘兵
Owner TSINGHUA UNIV
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