Series of micro/nano-rare earth materials and preparation method thereof

Abstract

The invention discloses a series of micro / nano-rare earth materials and a preparation method thereof. The method prepares a large amount of a series of rare earth micro / nano-materials with high dispersion, uniform particle size distribution and controllable sizes. The rare earth micro / nano-material comprises one or more of an oxidized rare earth material, a hydroxide rare earth material, a rare earth carbonate material, a rare earth oxalate material and a rare earth subcarbonate material. The preparation method comprises preparing a rare earth salt or a mixed solution of a rare earth salt andadditives, fast mixing the rare earth salt or the mixed solution and a precipitant solution in a nucleating reactor for a reaction, placing the slurry in a crystallization tank, carrying out crystallization, carrying out washing for solid and liquid separation to obtain products, and calcining the products to obtain a rare earth oxide material. The particle sizes of the product can be controlled in a range of 20-2000nm. The preparation method is easy to operate, has high efficiency and is used for large-scale production. The rare earth micro / nano-material can be used in the fields of catalysis, polishing, luminescence and magnetism.

Description

technical field [0001] The invention belongs to the technical field of rare earth material preparation, in particular to a series of micro / nano rare earth materials and preparation methods thereof, in particular to oxidized rare earth materials, hydroxide rare earth materials, carbonate rare earth materials, oxalic acid rare earth materials, basic rare earth carbonate materials and the like Preparation. Background technique [0002] my country is the country with the largest rare earth reserves in the world. Rare earth micro / nano materials have shown very good performance in the fields of light, electricity, force, heat, magnetism, and catalysis. The application fields of rare earth materials have penetrated into various industries in society. , and play a more prominent role in the field of national defense science and technology. However, at present, most of the rare earth products in our country are based on primary processing, the product grades are not high, and the tec...

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Problems solved by technology

At present, the common co-precipitation method is used in the production of rare earth materials in my country. This method has an obvious disadvantage: the rare earth salt solution and the precipitant solution are reacted by ordinary stirring in the reactor, and the reactants The contact area between them is small, the diffusion rate is slow, and there is a concentration gradient that leads to uneven reaction

During the reaction process, the precipitation formed in the early stage of the reaction is covered by new precipitation particles as the seed crystals of the later precipitation. The coexistence of new and old precipitation particles directly leads to the uneven particle size distribution of the material, which makes the particle size of the rare earth material synthesized The size and dispersion properties are greatly affected, and the existence of particles of different sizes also makes it difficult for the crystal size of the prepared rare earth material to reach the nanometer level, which greatly affects the performance and application fields of the material

[0004] In recent years, many researchers have tried hydrothermal method, solvothermal method, microemulsion method and sol-gel method to prepare rare earth nanomaterials and made good progress, but these methods are complicated to operate, expensive equipment, and harsh reaction conditions. Low output and high cost make it difficult to apply to large-scale production. Therefore, it is imminent to explore a preparation method that can accurately control the particle size and particle size distribution of rare earth nanomaterials and is suitable for industrial production.

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