Preparation method for nanoscale rare earth oxide powder

Abstract

The invention relates to the field of rare earth materials, in particular to a preparation method for nanoscale rare earth oxide powder. The preparation method comprises the steps that a precipitation method is adopted, rare earth material liquid of a nitric acid system or a hydrochloric acid system is taken as raw materials, a precipitant is added, and precipitating, filtering, drying and calcining are performed to obtain the rare earth oxide powder. The preparation method is characterized in that an inorganic dispersant is added before the precipitant is added, and a crystal grain growth inhibitor is added after the precipitant is added. According to the preparation method, the prepared nanoscale rare earth oxide powder is small and uniform in grain, easy to clarify and wash and low in production cost and can be produced on a scale on the basis of the precipitation method on the condition that special equipment is not added, it can be seen that the grain size of the powder is below 70 nanometers through electronic microscopy scanning, and production use is met.

Description

technical field [0001] The invention relates to the field of rare earth materials, in particular to a preparation method of nanoscale rare earth oxide powder. Background technique [0002] Our country has an advantage in the world in terms of rare earth resources and production. Rare earth nanomaterials and their applications have become a hot spot at present. Rare earth non-nanometer materials do not have comprehensive excellent properties, and their application prospects are huge. Rare earth oxides have been widely used in various fields of functional materials as luminescent materials, magnetic materials, superconductors, high-performance ceramics, ultraviolet absorbers, and precision polishing materials. Ultrafine rare earth oxide powder is an important part of rare earth nanomaterials. Due to its special physical and chemical properties, ultrafine rare earth oxide powder will be a new material in the 21st century. [0003] So far, the research on the preparation proce...

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Problems solved by technology

[0010] Precipitation method is the most common method for synthesizing nano-scale rare earth oxide powder by liquid-phase chemical reaction, which has the characteristics of low cost, simple process, and easy promotion to industrial production. The particle fineness and dispersibility of the powder, often adopt the method of adding organic dispersants and organic surfactants, but according to the long-term research and production of the applicant, the amount of organic dispersants and organic surfactants added in the precipitation method is large, The cost is high, and after adding an organic dispersant, the sediment particles are not easy to filter and wash, and there are negative problems such as the need for corresponding special equipment, which seriously affects the benefits of industrial production, and it is almost impossible to produce on a large scale in general industrial production

[0011] Solution combustion synthesis is widely used in the manufacture of powders, porous materials, dense materials and composite gradient materials. However, due to poor process controllability and high equipment requirements, it is rarely used in the preparation of nanoscale rare earth oxide powders.

[0012] The gas phase method is mainly used to prepare metal ultrafine powders, and is not suitable for the manufacture of rare earth oxide powders. There is no report on the use of lexical methods to manufacture rare earth oxide powders.

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