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Method for surface oxidation treatment of uranium oxide powder

A technology of surface oxidation treatment and uranium dioxide, which is applied in the direction of uranium dioxide, uranium oxide/hydroxide, and greenhouse gas reduction, can solve the problems that UO2 has not been reported, and achieve low production cost, promote diffusion, and improve Effects of formation and growth rate

Inactive Publication Date: 2008-09-03
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But currently for UO 2 The method for carrying out surface oxidation treatment has not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take the original O / U atomic ratio as 2.0 and the specific surface area as 2.70m 2 / gUO 2 Powder 20g, filled with Al 2 o 3 In the crucible, the surface powder is scraped off, the oxidizing medium is air, and the atmosphere is an open furnace door. will be fitted with UO 2 Powdered Al 2 o 3 Put the crucible into the tube furnace, open the furnace door and heat to 250°C, the heating rate is about 10°C / min, after 2 hours of heat preservation, the power is automatically cut off, cooled to about 90°C, and the crucible is taken out and air-cooled to obtain the surface of the present invention. Oxidized uranium dioxide powder.

[0021] After testing, the processed UO 2 Powder O / U atomic ratio is 2.10, specific surface area is 2.90m 2 / g.

Embodiment 2

[0023] Take the original O / U atomic ratio as 2.0 and the specific surface area as 2.70m 2 / gUO 2 Powder 20g, filled with Al 2 o 3 In the crucible, the surface powder is scraped off, the oxidizing medium is air, and the atmosphere is an open furnace door. will be fitted with UO 2 Powdered Al 2 o 3 Put the crucible into a tube furnace, open the furnace door and heat to 300°C, the heating rate is about 15°C / min, the power is automatically cut off after 4 hours of heat preservation, cooled to about 60°C, and the crucible is taken out and air-cooled to obtain the surface of the present invention. Oxidized uranium dioxide powder.

[0024] After testing, the processed UO 2 The powder O / U atomic ratio is 2.35 and the specific surface area is 4.10m 2 / g.

Embodiment 3

[0026] Take the original O / U atomic ratio as 2.0 and the specific surface area as 2.70m 2 / gUO 2 Powder 20g, filled with Al 2 o 3 In the crucible, the surface powder is scraped off, the oxidation medium is air, and the atmosphere is closed furnace air. will be fitted with UO 2 Powdered Al 2 o 3 Put the crucible into the tube furnace, close the furnace door and heat to 300°C with a heating rate of about 20°C / min. After 4 hours of heat preservation, the power will be automatically cut off, cooled to about 80°C, and the crucible will be taken out and air-cooled to obtain the surface of the present invention. Oxidized uranium dioxide powder.

[0027] After testing, the processed UO 2 The powder O / U atomic ratio is 2.29 and the specific surface area is 3.80m 2 / g.

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Abstract

The invention relates to a method of oxidation treatment of a surface of a uranium dioxide, which is characterized that the method comprises the following steps: (1) taking the UO2 powder and putting the UO2 powder into a tube type atmosphere oven, heating the UO2 powder under the condition of oxidation medium while the heating rate is 5 to 20 degree centigrade per minute, heating the UO2 powder to 250 degree centigrade to 400 degree centigrade and insulating for 2 to 6 hours; (2) when the UO2 powder is cooled to 100 degree centigrade to the room temperature in the oven, taking the UO2 powder out and cooling the UO2 powder in the air, so as to obtain the uranium dioxide powder with the oxidized surface. The method puts the UO2 in different oxidation medium and the UO2 is insulated at a certain temperature, then the surface oxygen content is increased, the surface area is increased, and the O / U atomic ratio of uranium dioxide and the surface area of the UO2 powder are enhanced. The oxidation medium obtained by the method has rich resources, low oxidation temperature and less consumption and has the advantages of simple fabrication process and low cost.

Description

technical field [0001] The invention relates to a surface oxidation treatment method, in particular to a method for treating UO 2 Surface oxidation treatment to improve its O / U atomic ratio and powder specific surface area. Background technique [0002] Nuclear power is a clean energy with great development potential, and the UO used in its reactor 2 Fuel pellets are traditionally sintered in a reducing atmosphere at about 1700°C. Due to the high sintering temperature and the need to use a hydrogen atmosphere, this process has certain risks and high energy consumption; at the same time, high-temperature sintering furnaces and boats for high-temperature sintering must be used, resulting in high production costs. With the increasingly prominent worldwide energy crisis and the enhancement of environmental protection awareness, on the one hand, the demand for nuclear power in countries around the world continues to increase, and on the other hand, the requirements for energy s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G43/025G21C3/60G21C21/02
CPCY02E30/30
Inventor 高家诚王勇吴曙芳
Owner CHONGQING UNIV
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