Preparation method of thorium-based mixed oxide ceramic microsphere

A technology of mixed oxides and ceramic microspheres, which is applied in the manufacture of reactors, reactors, and reduction of greenhouse gases. It can solve problems such as uneven distribution of thorium bases, and achieve the effects of reducing the rupture rate, ensuring uniformity, and improving stability.

Active Publication Date: 2018-03-23
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

[0007] In order to solve the problem of uneven distribution of thorium-based in fuel pellets in the above-mentioned prior art, the present invention aims to provide a preparation method of thorium-based mixed oxide ceramic microspheres

Method used

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  • Preparation method of thorium-based mixed oxide ceramic microsphere
  • Preparation method of thorium-based mixed oxide ceramic microsphere

Examples

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Embodiment 1

[0026] S1, preparation of thorium-cerium mixed colloid: weighing 41.12g Th(NO 3 ) 4 ·6H 2 O was prepared into 50mL of 1.4mol / L thorium nitrate solution, heated up to 50°C, and slowly added 3.84g Ce(NH 4 )(NO 3 ) 6 Stir until completely dissolved, make a mixed solution of Th / (Th+Ce) (molar ratio) = 0.9, heat to 60°C, add concentrated ammonia water at a rate of 0.3mL / min to adjust the neutralization degree to 80%, and form a hydrolysis polycondensation Solution, after the solution is cooled to room temperature, add 9mL of polyvinyl alcohol with a concentration of 80g / L while stirring, stir until it is completely uniform, then let it stand, and ultrasonically eliminate bubbles to obtain a thorium-cerium mixed colloidal solution.

[0027] S2, Vibration dispersion forming: Transport the thorium-cerium mixed colloid solution into the pipeline through a constant flow pump, and then disperse it into liquid droplets through the vibrator, then pass through the air zone and ammonia z...

Embodiment 2

[0032] S1, preparation of thorium-cerium mixed colloid: weigh 94.0g Th(NO 3 ) 4 ·6H 2 O was prepared into 100mL of 1.6mol / L thorium nitrate solution, heated to 80°C, and slowly added 26.31g Ce(NH 4 )(NO 3 ) 6 Stir until completely dissolved, make a mixed solution of Th / (Th+Ce) (molar ratio) = 0.7, heat to 60°C, add concentrated ammonia water at a rate of 0.5mL / min to adjust the neutralization degree to 85%, and form a hydrolysis polycondensation Solution, after the solution is cooled to room temperature, add 15mL of polyvinyl alcohol with a concentration of 80g / L while stirring, stir until it is completely uniform, then let it stand, and ultrasonically eliminate bubbles to obtain a thorium-cerium mixed colloidal solution.

[0033] S2, Vibration dispersion forming: Transport the thorium-cerium mixed colloid solution into the pipeline through a constant flow pump, and then disperse it into liquid droplets through the vibrator, then pass through the air zone and ammonia zone ...

Embodiment 3

[0037] S1, preparation of thorium-uranium mixed colloid: weighing 41.12g Th(NO 3 ) 4 ·6H 2 O was prepared into 50 mL of 1.4 mol / L thorium nitrate solution, heated to 50°C, and 6.90 g of UO was slowly added 2 (NO 3 ) 2 ·6H 2 Stir O until it is completely dissolved, make a mixed solution of Th / (Th+U) (molar ratio) = 0.8, heat to 60°C, add concentrated ammonia water at a rate of 0.4mL / min to adjust the neutralization degree to 80%, and form a hydrolyzed solution Polycondensation solution, after the solution is cooled to room temperature, add 8mL of polyvinyl alcohol with a concentration of 80g / L while stirring, stir until it is completely uniform, then let it stand, and ultrasonically eliminate bubbles to obtain a thorium-uranium mixed colloid solution.

[0038] S2, vibration dispersion forming: the thorium-uranium mixed colloid solution is transported into the pipeline through a constant flow pump, and then dispersed into droplets by a vibrator, then passes through the air ...

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Abstract

The invention relates to a preparation method of a thorium-based mixed oxide ceramic microsphere. The preparation method comprises the following steps of under the conditions of heating and stirring,adding cerous ammonium nitrate or uranyl nitrate and plutonium nitrate solid into a thorium nitrate solution to form a mixed solution, using ammonium hydroxide to adjust the pH (potential of hydrogen)value to form a hydrolysis solution, adding a thickener (polyvinyl alcohol solution) into the hydrolysis solution, and stirring, so as to form a thorium-based mixed sol solution; enabling an exciterto disperse the thorium-based mixed sol solution into liquid droplets, sequentially sending into an air section and an ammonia gas section, and finally sending into the ammonium hydroxide to form a gel microsphere; heating and aging the gel microsphere in concentrated ammonium hydroxide, alternatively washing by ethyl alcohol and thin ammonium hydroxide, washing by deionized water, flatly paving the single layer of washed gel microspheres in a drying furnace, and leading water vapor to heat and dry, so as to obtain the dried gel microsphere; placing the gel microsphere into a sintering furnace, and heating and sintering in an air atmosphere, so as to obtain the mixed oxide ceramic microsphere. The preparation method has the advantage that the fuel with uniform distribution of elements canbe prepared.

Description

technical field [0001] The invention relates to the preparation of nuclear fuel, in particular to a preparation method of thorium-based mixed oxide ceramic microspheres. Background technique [0002] At present, the proven thorium reserves on the earth are three times that of uranium reserves[IAEA.Thorium fuel cycle-Potential benefits and challenges[M].Vienna,IAEA,2005:IAEA-TECDOC-1450.]. The research on thorium fuel and its cycle has attracted great attention from some countries, especially those countries with scarce uranium resources but relatively rich thorium resources. [0003] Compared with the uranium fuel cycle, the thorium fuel cycle has the following advantages: (1) better neutron economy; (2) due to the better chemical stability and higher melting point of thorium oxide, the release of fission gas is less, etc. Allows thorium-based reactors to operate at higher temperatures and burnup; (3) accumulates fission products that are less toxic than uranium-based react...

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 黄鹤严超曹长青王鹏林俊
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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