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Method for preparing ceramic micro-spheres of thorium oxide

A technology of ceramic microspheres and thorium oxide, applied in the field of preparation of ceramic microspheres, can solve the problems of complex thorium oxide process, etc., and achieve the effects of avoiding the use of ammonia water or organic matter, reducing the rupture rate, and avoiding a large amount of release.

Active Publication Date: 2017-08-04
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] In order to solve the problem of complex process for preparing thorium oxide in the above-mentioned prior art, the present invention aims to provide a preparation method of ceramic microspheres of thorium oxide

Method used

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  • Method for preparing ceramic micro-spheres of thorium oxide
  • Method for preparing ceramic micro-spheres of thorium oxide

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Embodiment 1

[0025] S1, preparation of thorium oxide colloid: weighing 105.75g Th(NO 3 ) 4 ·6H 2 O was prepared into 150 mL of 1.2 mol / L thorium nitrate solution, heated up to 60°C, and 15 mol / L ammonia water was added dropwise at a rate of 2 mL / min until the pH of the solution was 3.0, then changed to a rate of 0.5 mL / min and concentrated ammonia water was added dropwise When the pH of the solution is 3.9, there are tiny precipitates that are not dissolved, add 0.1Ml glacial acetic acid dropwise, stir and react at 60°C to obtain a transparent colloid, forming a hydrolysis solution. After cooling, add 25 mL of 120 g / L PVA with stirring. After fully stirring evenly, let stand to eliminate air bubbles and form thorium oxide colloid.

[0026] S2, Dispersed Aging: The thorium oxide colloid was transported into a needle valve with a diameter of 21 g by pressure transport to disperse into liquid droplets, and then passed through the helium gas zone, ammonia gas zone, and ammonia water zone in...

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Abstract

The invention relates to a method for preparing ceramic micro-spheres of thorium oxide. The method includes dropwise adding ammonia water into thorium nitrate solution to form hydrolysis solution, dropwise adding glacial acetic acid into the hydrolysis solution to regulate the pH (potential of hydrogen) of the hydrolysis solution, and adding polyvinyl alcohol into the hydrolysis solution under stirring conditions to form thorium oxide colloidal solution; dispersing the thorium oxide colloidal solution to obtain liquid drop and allowing the liquid drop to sequentially flow through helium zones, ammonia gas zones and ammonia water zones; arranging dispersed gel particles in strong ammonia water and aging the dispersed gel particles; adding the aged gel particles and deionized water into a hydrothermal reaction kettle and carrying out temperature reaction; placing gel particles into a drying furnace after hydrothermal reaction is carried out on the gel particles, and heating and drying the gel particles under humidity control to form dried gel particles; placing the dried gel particles in a calcination furnace, filling the calcination furnace with air and heating and calcining the gel particles to obtain calcined gel particles; placing the calcined gel particles in a sintering furnace, filling the sintering furnace with air and heating and sintering the calcined gel particles to obtain the ceramic micro-spheres. The method has the advantage that the ceramic micro-spheres of the thorium oxide can be prepared by the aid of simple technologies.

Description

technical field [0001] The present invention relates to the preparation of nuclear fuel, more specifically to a preparation method of ceramic microspheres of thorium oxide. Background technique [0002] Compared with the uranium-plutonium fuel cycle, the thorium-uranium fuel cycle has the following advantages: abundant resources, high conversion rate, less nuclear waste, conducive to preventing nuclear proliferation, and good adaptability. At present, a lot of research has been carried out on the utilization of thorium resources in the world, including heavy water reactors and fourth-generation reactors, etc., have also carried out preliminary research on the utilization of thorium. [0003] Spherical fuel elements based on Tri-structural isotropic TRISO coated fuel particles, the core of which is thorium oxide (ThO 2 ), uranium oxide (UO 2 ) or thorium-uranium mixed oxide. Tsinghua Institute of Nuclear and New Energy uses a gel-supported precipitation method to prepare T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/624C04B35/626G21C21/02
CPCC04B35/50C04B35/624C04B35/62695G21C21/02Y02E30/30
Inventor 严超黄鹤王鹏曹长青林俊朱智勇
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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