Device and process for preparing rare-earth compound uniform micro powder

Abstract

The invention provides a device for preparing rare earth compound uniform micro powders and a process thereof. The device comprises a static mixing reactor, a uniform crystallization tank with a stirring paddle, a feed liquid storage tank, a precipitating agent storage tank, and a flow rate, temperature and rotation speed control system. The device is used for precipitation synthesis of a single or compound rare earth carbonate, rare earth oxide, rare earth hydroxide, rare earth fluoride, rare earth oxalate or rare earth phosphate as well as compounds of rare earth and other metal. The method comprises the steps of adding a rare earth feed liquid and a precipitating agent feed liquid into the static mixing reactor, completely mixing the feed liquid in the reactor to form slurry with a crystal nucleus; and feeding the slurry into the uniform crystallization tank to obtain an uniform rare earth compound precursor, filtering, washing, drying, and calcinating to obtain rare earth compound micro powders with uniform particle size distribution, wherein the particle size can be adjusted in a range of 0.3-10 mum, and the particle size distribution (D90-D10)/D50 is less than 2. The rare earth compound prepared using the inventive device and process has the advantages of uniform particle size, narrow particle size distribution, good crystallization degree, good stability and less agglomeration. The inventive process is simple and applicable to industrial production.

Description

technical field [0001] The invention relates to a device for preparing uniform micropowder of rare earth compounds and a process for preparing uniform micropowder of rare earth compounds using the device. technical background [0002] The formation of ultrafine powder particles includes two processes, namely, the nucleation process and the particle growth process. In order to obtain a uniform powder material, it is the key technology to separate these two processes. In the field of rare earth compound synthesis, the chemical precipitation method has been widely used due to its simple process and precise control of chemical composition, and has been extended to rare earth oxides, rare earth polishing powders, rare earth fluorescent materials, rare earth co-precipitates, rare earth The field of preparation of rare earth materials such as catalytic materials. The synthesis device currently used in the precipitation method is mainly a mechanically stirred reactor. However, as...

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At present, there is no device and preparation method to separ

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