Preparation method of Nb2O5-doped thorium dioxide pellets

A technology of thorium dioxide and pellets, which is applied in the field of preparation of Nb2O5-doped thorium dioxide pellets, can solve the problems of insufficient utilization of thorium, achieve the effects of reducing production costs, reducing preparation difficulty, and simple process

Inactive Publication Date: 2017-07-07
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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Problems solved by technology

[0002] Fuels for fission nuclear energy can be divided into two types: uranium-based and thorium-based. The research on thorium-based nuclear fuels, like the research on uranium

Method used

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Embodiment Construction

[0013] The present invention will be described in detail below in conjunction with specific embodiments.

[0014] A kind of doped Nb described in the present invention 2 o 5 The preparation method of thorium dioxide pellets comprises the following steps:

[0015] Step 1, doping Nb 2 o 5 Thorium dioxide pellet powder preparation

[0016] Step 1.1, powder granulation. After the powder passes through the granulation process, the fluidity and molding ability of the powder can be improved. Therefore, the thorium dioxide raw powder is subjected to a granulation process. The high-strength steel mold is used as the granulation mold to press the green body with a pressure of 8-10T and a holding time of 20-25s, and then the green body is crushed and screened to obtain particles between 150μm and 300μm as the finished pellets. The granulation of the present invention mainly includes the steps of pre-pressing cake, crushing and screening. The mixed powder is pressed into a cylindric...

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Abstract

The invention belongs to the technical field of application of thorium-based nuclear fuel pellets and particularly relates to a preparation method of Nb2O5-doped thorium dioxide pellets. The preparation method includes pressing a blank through a pressing process, crushing the pressed blank, and screening the crushed blank to obtain particles with the particle size between 150 micrometers and 300 micrometers as finished particles; mixing Nb2O5 powder with ThO2 power uniformly; subjecting thorium dioxide pellets to cold-pressing molding, and using pelletized ThO2-0.25 wet% Nb2O5 powder for pellet molding, wherein an inner diameter of a female mould of a mould is of a cylindrical structure, the pellet molding powder is 1.58+/-0.20 g, pressure rise rate is 0.8-1.2 KN/s, molding dwelling time lasts for 10-15 seconds, green body density is controlled within 5.3-5.5 g/cm<3>; sintering the Nb2O5-doped thorium dioxide pellets in three holding stages including a low-temperature stage, a medium-temperature stage and a high-temperature stage. The preparation method is simple in process, easy in Nb2O5 powder addition, lower in ThO2 pellet preparation difficulty and ThO2 pellet production cost and beneficial to industrialized production.

Description

technical field [0001] The invention belongs to the technical field of application of thorium-based nuclear fuel pellets, in particular to a doped Nb 2 o 5 Preparation method of thorium dioxide pellets. Background technique [0002] Fuels for fission nuclear energy can be divided into two types: uranium-based and thorium-based. The research on thorium-based nuclear fuels, like the research on uranium-based nuclear fuels, also began with the "Manhattan" project in the United States. However, due to various reasons, thorium is currently used in the nuclear industry. Not many. As a nuclear fuel, thorium has three times more resources than uranium. The application of thorium fuel will greatly enrich nuclear fuel resources. THO 2 thermal conductivity than UO 2 50% higher melting temperature than UO 2 340°C higher, the operating temperature of the fuel is lower, and the release of fission gas is compared with UO at the same power 2 Low, and all thorium is directly usable nu...

Claims

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Application Information

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IPC IPC(8): G21C21/02G21C3/62
CPCG21C3/623G21C21/02Y02E30/30
Inventor 刘文涛茹利利何亚斌蔚晨光
Owner CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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