Method for preparing uranium dioxide microspheres at normal temperature

A technology of uranium dioxide and microspheres, which is applied in the field of preparation of uranium dioxide microspheres at room temperature, which can solve the problems of uneven size, poor sphericity of gel microspheres, and unsatisfactory mixing effect, and achieve uniform size and weakened heat conduction The effect of good sphericity

Active Publication Date: 2020-04-21
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of small Re numbers (high viscosity solutions), the mixing effect is not ideal
In addition, the vibration dispersion method is used to disperse the liquid droplets. The dispersed liquid droplets fall into the microwave tube under the action of gravity. Poor sphericity and uneven size of the ball

Method used

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  • Method for preparing uranium dioxide microspheres at normal temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) will U 3 o 8 Powder and HNO with a molar concentration of 16mol / L 3 Mixing, the mass volume ratio of mixing is: U 3 o 8 Powder:HNO 3 =1:0.44g / mL, add deionized water to the mixture, heat and dissolve at 80°C for 2 hours, and make U 3 o 8After the powder is completely dissolved, cool to 20°C, filter, add deionized water to the filtrate to obtain a uranyl nitrate solution with a concentration of 2.8mol / L, which is recorded as the first mixed solution, and cool the prepared first mixed solution to 5°C, set aside;

[0030] (2) preparation molar concentration is the hexamethylenetetramine (HMTA) of 3mol / L and the mixed solution of the urea (Urea) that molar concentration is 3mol / L, the volume ratio of mixing is: hexamethylenetetramine: urea =1:1, the second mixed solution is obtained, and the second mixed solution is cooled to 5°C for subsequent use;

[0031] (3) inject the first mixed solution and the second mixed solution into the container at the same time at ...

Embodiment 2

[0037] (1) will U 3 o 8 Powder and HNO with a molar concentration of 16mol / L 3 Mixing, the mass volume ratio of mixing is: U 3 o 8 Powder:HNO 3 =1:0.44, add deionized water to the mixture, heat and dissolve at 80°C for 2 hours, and make U 3 o 8 After the powder is completely dissolved, cool to 20°C, filter, add deionized water to the filtrate to obtain a uranyl nitrate solution with a concentration of 2.8mol / L, which is recorded as the first mixed solution, and cool the prepared first mixed solution to 5°C, set aside;

[0038] (2) preparation molar concentration is the hexamethylenetetramine (HMTA) of 3mol / L and the mixed solution of the urea (Urea) that molar concentration is 3mol / L, the volume ratio of mixing is: hexamethylenetetramine: urea =1:1, the second mixed solution is obtained, and the second mixed solution is cooled to 5°C for subsequent use;

[0039] (3) inject the first mixed solution and the second mixed solution into the container at the same time respec...

Embodiment 3

[0045] (1) will U 3 o 8 Powder and HNO with a molar concentration of 16mol / L 3 Mixing, the mass volume ratio of mixing is: U 3 o 8 Powder:HNO 3 =1:0.44, add deionized water to the mixture, heat and dissolve at 80°C for 2 hours, and make U 3 o 8 After the powder is completely dissolved, cool to 20°C, filter, add deionized water to the filtrate to obtain a uranyl nitrate solution with a concentration of 3mol / L, which is recorded as the first mixed solution, and the prepared first mixed solution is cooled to 5℃, standby;

[0046] (2) preparation molar concentration is the hexamethylenetetramine (HMTA) of 3mol / L and the mixed solution of the urea (Urea) that molar concentration is 3mol / L, the volume ratio of mixing is: hexamethylenetetramine: urea =1:1, the second mixed solution is obtained, and the second mixed solution is cooled to 5°C for subsequent use;

[0047] (3) inject the first mixed solution and the second mixed solution into the container at the same time at a f...

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Abstract

The invention relates to a method for preparing uranium dioxide microspheres at normal temperature, and belongs to the technical field of ceramic forming. According to the method, components in an internal gel solution are divided into a uranyl nitrate solution (ADUN) stable at normal temperature and a mixed solution (HMUR) of urea and hexamethylenetetramine; the two solutions are rapidly mixed inan automatic mixing device to form an unstable uranium glue solution; the mixed uranium glue solution rapidly enters silicone oil, and is shear into liquid drops with uniform sizes by the silicone oil; the liquid drops and the silicone oil are cured into gel microspheres by a microwave heating device; and the gel microspheres are washed, dried and sintered to obtain monodisperse UO2 sintered microspheres with uniform sizes and good sphericity. According to the invention, microfluidic control is adopted in the whole process of the method, so that the UO2 microspheres are prepared at normal temperature through an internal gel method without human interference, and the automation degree is high.

Description

technical field [0001] The invention relates to a method for preparing uranium dioxide microspheres at room temperature, and belongs to the technical field of ceramic molding. Background technique [0002] The inner gel method in the sol-gel method can avoid direct processing of radioactive powder due to the good sphericity of the prepared microspheres, and becomes UO 2 The first choice for the preparation method of ceramic microspheres. The inner gel method utilizes the thermal instability of hexamethylenetetramine (HMTA), which will decompose and release ammonia when heated, and solidify the sol droplets into shape. Therefore, the glue of the inner gel needs to be frozen in a low temperature environment, mixed evenly in a low temperature environment, then gelled and dispersed into droplets, and finally heat-cured and formed. From the mechanism of the inner gel, it can be seen that the inner gel glue is unstable at normal temperature, and the inner gel glue of uranium can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G43/025
CPCC01G43/025C01P2004/32
Inventor 徐瑞马景陶郝少昌赵兴宇李建军邓长生刘兵
Owner TSINGHUA UNIV
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