Preparation method of monodisperse rare earth oxide ultrafine powder

Abstract

The invention relates to a preparation method of monodisperse rare earth oxide ultrafine powder. The preparation method comprises the following steps: (1) adding rare earth oxide serving as a raw material into a mixing container, then adding deionized water into the mixing container, uniformly stirring the slurry, putting the mixed slurry into a sand mill for high-speed ball milling, and then discharging the slurry subjected to high-speed ball milling from the sand mill to obtain rare earth oxide slurry; (2) performing suction filtration on the rare earth oxide slurry prepared in the step (1)to obtain a rare earth oxide filter cake, putting the rare earth oxide filter cake into a vacuum drying oven for primary drying, and sieving the filter cake after drying for a certain time to obtain rare earth oxide powder; and (3) putting the rare earth oxide powder prepared in the step (2) into a blast drying oven for secondary drying. According to the preparation method, a physical method is adopted, hard agglomeration of the powder is avoided in a two-time drying mode, and the preparation method of the monodisperse rare earth oxide ultrafine powder is easy to operate, high in crystallinityand suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of rare earth oxide powder preparation, in particular to a method for preparing ultrafine monodisperse rare earth oxide powder with simple operation and high crystallinity, which adopts a physical method and uses two drying methods to avoid hard agglomeration of powder. Background technique [0002] Rare earth oxides show superior performance in aviation, aerospace, atomic energy, ceramics, magnetic materials, luminescent materials, and glass coloring applications. They are mainly used to manufacture magnetic materials for microwaves and single crystals of important materials for military industry. They can also be used to manufacture high-temperature heat-resistant materials. Alloys, aircraft nozzles, etc. Compared with conventional powders, rare earth oxide ultrafine powders have excellent physical and chemical properties, and have been widely used in high-tech materials, especially monodisperse rare earth ...

AI Technical Summary

Problems solved by technology

[0003] Traditional monodisperse rare earth oxide superfine powder is generally prepared by chemical precipitation method, which is easy to obtain powder with smaller particle size. A certain temperature, pH value, and then drying and other processes to obtain ultrafine rare earth oxides. The disadvantages of this method are: the prepared rare earth oxides are mostly irregular powders, and the particle size distribution is not uniform, and The process is not easy to control, the main reason is that the chemical precipitation method is a method of re-nucleation and recrystallization growth. The conditions for the growth of the crystal nuclei are difficult to control, and it is easy to form irregular powders. At the same time, the initial crystal grains have a high Surface energy is easy to cause adsorption between particles and form agglomeration, so it is not suitable for the preparation of monodisperse rare earth oxide ultrafine powder, and it is difficult to meet the relevant needs of users

[0004] In addition, ordinary ball milling method is used to prepare ultrafine rare earth oxide powder, and the ultrafine powder is directly prepared by physical method. The disadvantage of this method is that the ball milling medium is water, which belongs to polar molecules. The subsequent drying process of this method adopts a simple drying method , in the drying process, it is easy to cause hard agglomeration of powder, which makes the prepared ultrafine oxide powder agglomerate seriously and have poor fluidity. Generally, a honeycomb mill is used for depolymerization, but the investment in equipment is large, and it is easy to bring in impurity pollution, and the production cost high

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