Preparation method for anhydrous rare earth chloride

Abstract

The invention discloses a preparation method for an anhydrous rare earth chloride. The method comprises the following steps: step 1, performing first-stage fluidization dehydration on a rare earth chloride heptahydrate under the temperature of 60 DEG C-100 DEG C to obtain a crude product of a rare earth chloride trihydrate; step 2, performing second-stage fluidization dehydration on the crude product of the rare earth chloride trihydrate under the temperature of 120 DEG C-130 DEG C to obtain a crude product of a rare earth chloride monohydrate; and step 3, performing third-stage fluidization dehydration on the crude product of the rare earth chloride monohydrate under the temperature of 140 DEG C-160 DEG C to obtain the anhydrous rare earth chloride, wherein the third-stage fluidization dehydration is carried out in a hydrogen chloride gas atmosphere. According to the preparation method for the anhydrous rare earth chloride provided by the invention, the rare earth chloride heptahydrate is subjected to staged fluidization dehydration, and the hydrogen chloride protection gas atmosphere is provided, so that hydrolysis in the process of dehydration of the intermediate product rare earth chloride monohydrate to the anhydrous rare earth chloride is effectively inhibited, and the product purity is greatly improved; and the preparation method for the anhydrous rare earth chloride hasthe advantages of a low dehydration temperature, low preparation costs and good dehydration effects.

Description

technical field [0001] The invention belongs to the technical field of rare earth material preparation, and specifically relates to a method for preparing anhydrous rare earth chloride by using heptahydrate rare earth chloride as a raw material. Background technique [0002] Rare earth elements are elements with a strategic position in the 21st century. With their unique physical and chemical properties such as light, electricity, and magnetism, they are widely used in various fields of the national economy and defense industry. Therefore, rare earth elements are called "new materials of the 21st century". treasury". In recent years, rare earth elements have attracted more and more attention due to their important biological activities and pharmacological effects. [0003] The method for preparing anhydrous rare earth chloride has following 4 kinds at present: (1) tetrahydrofuran complex method, namely Deacon in 1979, the method for preparing anhydrous rare earth chloride b...

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Problems solved by technology

[0005] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a preparation method of anhydrous rare earth chloride, the preparation method has the advantages of simple process, high dehydration efficiency, low preparation temperature, and alleviates the problem of equipment corrosion, while the environment Little pollution, and the prepared anhydrous rare earth chloride has high purity

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