Preparation method of monodisperse micron-sized uranium oxide particle

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...

AI Technical Summary

Problems solved by technology

Subsequently, in 1977, Bezzi.Giovanni used the precipitation method to prepare carbon-containing thorium, uranium, plutonium oxide particles and carbon-containing oxide particles mixed with the three (Bezzi.Giovanni, Facchini.Alessandro, Martignani. Giovanni et al. Production of microspheres of thorium oxide, uranium oxide and plutonium oxide and their mixtures containing carbon[P].United States: 4202793, 1980-5-13), but its preparation method is relatively cumbersome, and it is also included in its patent No information about particle morphology disclosed

By 2000, N.Erdmann et al. used the method of sol spray thermal decomposition (N.Erdmann, M.Betti, O.Stetzer et al.Production of monodisperse uranium oxide particles and their characterization by scanning electron microscopy and secondary ion massspectrometry[J] .Spectrochimica Acta Part B, 2000, 55:1565-1575), successfully prepared monodisperse uranium oxide particles with a particle size of 1 μm. This method is relatively mature, but there are still certain problems in the preparation of larger particles

In 2003, Zitouni Ould-Dada and others also used the method of sol spray thermal decomposition to prepare quasi-monodisperse uranium oxide particles. The particle size distribution is in the range of 0.13-1.37 μm, which cannot meet the requirements of monodispersity ( Zitouni Ould-Dada, George Shaw, Rob Kinnersley. Production of radioactive particles for use in environmental studies [J]. Journal of Environmental Radioactivity, 2003, 70: 177-191)

But relatively speaking, the equipment in the technical solution provided by ITU is relatively complicated. For example, a carrier gas preheating device is added inside the vibrating hole aerosol generator; during the process of particles passing through the carrier gas, an auxiliary gas is selected to be added; During the thermal decomposition process, ITU uses three muffle furnaces connected in series to raise the temperature step by step

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