Method for preparing ceramic microspheres of thorium-based carbides and/or thorium-based oxycarbides

A technology of ceramic microspheres and carbides, which is applied in the direction of reactor fuel materials, greenhouse gas reduction, nuclear power generation, etc., can solve the problems that thorium carbide cannot be simply prepared, and achieve uniform drying, cost reduction, high mechanical strength and The effect of mechanical properties

Active Publication Date: 2017-09-05
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem that thorium carbide cannot be simply prepared in the above-mentioned prior art, the present invention aims to provide a method for preparing ceramic microspheres of thorium-based carbide and / or thorium-based oxycarbide

Method used

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  • Method for preparing ceramic microspheres of thorium-based carbides and/or thorium-based oxycarbides
  • Method for preparing ceramic microspheres of thorium-based carbides and/or thorium-based oxycarbides

Examples

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Embodiment 1

[0024] S1, preparation of carbon-containing colloids: weighing 70.5gTh(NO 3 ) 4 ·6H 2 O is prepared into 100mL of 1.2mol / L thorium nitrate solution, heated to 60°C, and 15mol / L ammonia water is added dropwise at a rate of 1mL / min until the pH of the solution is 3.4 to form a hydrolysis solution; the hydrolysis solution is cooled and stirred Add 20 mL of 100 g / L polyvinyl alcohol (PVA) to form a sol. Weigh 4.8 g of carbon powder with a particle size of 7-11 μm, add 20 mL of absolute ethanol and stir evenly to form pre-dispersed carbon powder. Slowly add the sol to the carbon powder pre-dispersed with ethanol, stir well and then let it stand to eliminate air bubbles to form a carbon-containing colloidal solution.

[0025] S2, gel particle dispersion: the carbon-containing colloidal solution is dispersed into droplets and then passes through the helium gas zone, the ammonia gas zone, and the ammonia water zone in sequence to form gel particles.

[0026] S3, aging, washing and...

Embodiment 2

[0029] S1, preparation of carbon-containing colloids: weighing 60g Th(NO 3 ) 4 ·6H2 O is prepared into 100 mL of 1.0 mol / L thorium nitrate solution, heated up to 80°C, and 15 mol / L ammonia water is added dropwise at a rate of 1.5 mL / min until the pH of the solution is 3.86 to form a hydrolyzed solution; the hydrolyzed solution is cooled and stirred Add 25mL of 100g / L PVA to form a sol. Weigh 2.4 g of carbon powder with a particle size of nanometer size, add 10 mL of absolute ethanol and stir evenly to form pre-dispersed carbon powder. Slowly add the sol to the carbon powder pre-dispersed with ethanol, stir well and then let it stand to eliminate air bubbles to form a carbon-containing colloidal solution.

[0030] S2, gel particle dispersion: the carbon-containing colloidal solution is dispersed into droplets and then passes through the helium gas zone, the ammonia gas zone, and the ammonia water zone in sequence to form gel particles.

[0031] S3, aging, washing and drying:...

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Abstract

The invention relates to a method for preparing ceramic microspheres of thorium-based carbides and / or thorium-based oxycarbides. The method comprises the following steps: dripping a thorium nitrate solution into ammonium hydroxide so as to form a hydrolysis solution; adding polyvinyl alcohol while stirring the hydrolysis solution so as to form sol; dispersing carbon powder by utilizing an organic reagent which is mutually soluble with water so as to form pre-dispersed carbon powder; adding the sol into the pre-dispersed carbon powder so as to form a carbon-containing colloidal solution; dispersing the carbon-containing colloidal solution into liquid drops, and enabling the liquid drops to sequentially pass through a helium area, an ammonia gas area and an ammonium hydroxide area so as to form gel particles; ageing the gel particles in stronger ammonia water, washing with deionized water, adding the washed gel particles into a drying furnace, controlling the humidity, heating and drying so as to form the dried gel particles; and adding the dried gel particles into a sintering furnace, heating and sintering under vacuum conditions, thereby obtaining the ceramic microspheres. According to the preparation method disclosed by the invention, the ceramic microspheres of thorium-based carbides and / or thorium-based oxycarbides are prepared through a simple process.

Description

technical field [0001] The present invention relates to the preparation of nuclear fuel, more specifically to a method for preparing ceramic microspheres of thorium-based carbide and / or thorium-based carbon oxide. Background technique [0002] With the development of nuclear energy, the problem of shortage of uranium resources has become increasingly prominent. On the other hand, due to the abundant reserves of thorium resources and the large neutron absorption cross section, the utilization of thorium resources is a potential solution to the sustainable development of nuclear energy. A large number of researches have been carried out on the utilization of thorium resources in the world. [0003] Due to the advantages of high stability and high melting point of oxides, currently spherical fuel elements based on Tri-structural isotropic TRISO coated fuel particles all use oxides as fuel cores. However, during the fission process, the excess oxygen atoms in the oxides are pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/62G21C3/42
CPCG21C3/42G21C3/62Y02E30/30
Inventor 严超黄鹤曹长青林俊朱智勇
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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