Preparation method of monodisperse micron-sized uranium oxide particle

A uranium oxide and monodisperse technology, which is applied in the field of particle preparation, can solve the problems of not disclosing particle morphology information, not satisfying monodispersity, cumbersome preparation methods, etc., and achieves the effects of ensuring safety, easy operation, and simple technical solutions

A uranium oxide and monodisperse technology, which is applied in the field of particle preparation, can solve the problems of not disclosing particle morphology information, not satisfying monodispersity, cumbersome preparation methods, etc., and achieves the effects of ensuring safety, easy operation, and simple technical solutions

CN101891253AActive Publication Date: 2010-11-24CHINA INSTITUTE OF ATOMIC ENERGY
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  • Preparation method of monodisperse micron-sized uranium oxide particle
  • Preparation method of monodisperse micron-sized uranium oxide particle
  • Preparation method of monodisperse micron-sized uranium oxide particle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment takes the preparation of 2 μm monodisperse uranium oxide particles as an example. Using the VOAG-3450 vibrating hole aerosol generator produced by TSI Company of the United States, the vibrating orifice plate was redesigned to be made of stainless steel. U3O8 reference reagent 235 U / 238 U nominal value is 7.25×10 -3 .

[0027]The uranyl nitrate solution solution needs to be prepared before preparation. The configuration method is to weigh about 0.098g of U3O8 powder, put it into a polytetrafluoroethylene beaker, add about 15ml of 1mol / L nitric acid, then evaporate the solvent to about 2ml left, and finally add deionized water to make up the volume to 25ml, the concentration of uranyl nitrate is 5.5×10 -3 g / ml solution, using 1:1 (volume ratio) mixed isopropanol and deionized water as a solvent to carry out gradual dilution of the above concentrated solution to obtain 3.2 × 10 -4 g / ml of uranyl nitrate solution.

[0028] The preparation process of...

Embodiment 2

[0035] The operation steps are the same as in Example 1, except that in step 1, the vibration frequency of the vibrating hole aerosol generator is set to 57.2kHz, and the flow rate of the carrier gas is 45L / min; in step 2, the temperature of the heating zone is set to 115°C, The temperature of the carrier gas is raised to about 75-77°C; in step 3, the solid particles of uranyl nitrate are thermally decomposed through a muffle furnace, and the heating temperature of the muffle furnace is 740-750°C.

Embodiment 3

[0037] The operation steps are the same as in Example 1, the difference is that: in step 1, the flow rate of the carrier gas is 35L / min; , The solid particles of uranyl nitrate are thermally decomposed by a muffle furnace at a high temperature, and the heating temperature of the muffle furnace is 650-670°C.

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Abstract

The invention discloses a method for preparing a monodisperse micron-sized uranium oxide particle by using a sol-spray thermal decomposition method. The method comprises the following steps of: forming a monodisperse aerosol by a uranyl nitrate solution by using a vibrating orifice aerosol generator; drying and carrying out static removal to form a uranyl nitrate solid particle; carrying out high-temperature thermal decomposition to form a monodisperse uranium oxide particle; and collecting after cooling, wherein carrier gas is preheated at the back end of a neutralizer to a temperature of 70-80 DEG C or so, the flow of the carrier gas is 35-45 L / min, and the high-temperature thermal decomposition is carried out by the direct heating of a muffle furnace. The technical scheme of the invention is simpler and more convenient and ensures the safety in the operation process.

Description

technical field [0001] The invention belongs to a method for preparing microparticles from liquid materials by physical and chemical methods, and in particular relates to a method for preparing monodisperse micron-sized uranium oxide particles by using a sol spray thermal decomposition method. Background technique [0002] Monodisperse is also called monodisperse system or monodistribution, and usually refers to a dispersion system with a single dispersed phase component and a narrow particle size distribution. [0003] Uranium particulate isotope analysis plays an important role in nuclear safeguards environmental monitoring. In order to ensure the precision and accuracy of accurately measuring the uranium isotope ratio in a single particle, as well as to monitor the quality of the analysis process and evaluate the experimental process, it is necessary to simulate the chemical composition, physical form and Geometric dimensions and other properties to prepare working stand...

Claims

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Application Information

Patent Timeline
24 Nov 2010
Publication
CN101891253A
IPC
C01G43/01
Inventors
王凡; 常志远