Process for preparing nano rareearth oxidate powder

Abstract

The preparation method of nano rare earth oxide powder includes the following steps: mixing the nitric acid or hydrochloric acid aqueuos solution of raw material rare earth and precipitant carbonate,making ignition, specially, the rare earth nitrate is Ln(NO3)3 and rare earth hydrochloride is LnCl3, in which Ln=La, Nd, Sm, Gd, Eu, Y, Ce and Dy. and the mole number of its aqueous solution is 0.1-0.6 mol / L; then mixing the aqueous solution of the precipitant NaOH or carbonate Na2CO3 whose concentration is 0.3-0.6 mol / L with the above-mentioned Ln(NO3)3 or LnCl3 aqueous solution, their volume ratio of is 1.5-3:1 pH value is 6-7, stirring for above 10 min. and drying to obtain basic carbonate or carbonate or hydroxide, stirring dispersing agent alcohol material and the above-mentioned obtained material.

Description

1. Technical field [0001] The invention relates to a preparation method of nano rare earth oxide powder. 2. Background technology [0002] Nano-rare earth oxides and their products have many new properties. They can be used as high-efficiency catalysts in the petrochemical industry, new solid catalysts for organic silicon synthesis, new catalysts and photocatalysts in rubber and polymer synthesis, and can also be used as As a harmful gas degradation reactor, new rare earth nano-optical materials, etc., in superplastic nano-Y 2 o 3 Stabilized ZrO 2 Ceramics and other aspects have broad application value. Therefore, people have adopted a variety of preparation methods to obtain nano-rare earth oxide powder. Currently, the commonly used preparation methods mainly include hydrolysis method, hydrothermal method, and various forms of precipitation methods, etc., but none of them have good dispersion and particle size. Uniform nano-scale pure rare earth oxide powder, as disclos...

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Problems solved by technology

However, there are many shortcomings in this method. First, the particle size of the prepared rare earth oxide powder is in a wide scale range from nanometer to submicron level, and the products with small particle size are mostly agglomerated, which cannot meet the requirements. Some nano-scale powders that only need small particle sizes and their requirements for good dispersion and uniformity; secondly, ammonia water is used in the preparation process, so ammonia gas is emitted, causing certain pollution to the environment

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