Chemical device and method for preparing ultra-fine rare earth compound through device

Abstract

The invention provides a chemical device and a method for preparing an ultra-fine rare earth compound through the device. The device comprises a feeding unit (1) and a stirring unit (2), the stirring unit (2) is provided with an airtight cavity provided with an inlet (5) and an outlet (6), and a stirring impeller (7) is disposed in the cavity; the feeding unit (1) is tubular, one end of the feeding unit is a feeding end, and the other end of the feeding unit is connected with the inlet (5) of the stirring unit (2). The feeding unit (1) is provided with at least two feed inlets (3), and the tail end of each feed inlet (3) is provided with a nozzle (4). Rare earth feed liquid and a precipitator enter the feeding unit from different feed inlets (3) and the nozzles (4) of the feeding unit (1), are stirred by the stirring impeller (7) at high speed, react with each other and then are sprayed out through the outlet (6). The obtained slurry is filtered, washed, dried or fired, and the ultra-fine rare earth compound is obtained. The device is small and simple in structure, convenient to manufacture and use, easy to clean and capable of being used for preparing the ultra-fine rare earth compound with D50 smaller than or equal to 1 micrometer, and parts are easy to replace.

Description

technical field [0001] The invention relates to a chemical device and a method for preparing ultrafine rare earth compounds by using the device, belonging to the technical field of chemical reaction equipment and preparation methods. Background technique [0002] In the field of chemical industry, it is often necessary to carry out some reactions such as mixing, dispersion or precipitation. Most of these reactions are carried out in some large or relatively complex equipment, and the purpose of mixing, dispersion or precipitation is achieved by stirring. [0003] The preparation method of rare earth ultrafine powder can be divided into solid phase method, liquid phase method and gas phase method according to the aggregation state of the substance. The solid-phase method has a large processing capacity, but its energy utilization rate is low, impurities are easily introduced during the preparation process, the prepared powder has a wide particle size distribution, and the sha...

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Problems solved by technology

[0006] In the process of preparing ultrafine powder by reactor precipitation method, due to the large volume of the reactor, the stirring speed is low (generally tens to more than 100 revolutions per minute), and it is uneven; and the total time of precipitation is long, and the precipitated particles are in the reactor. Always in an environment with high ionic strength, the particles are easy to grow and agglomerate, resulting in the particle size of the final product not meeting the requirements of ultrafine powder, and the particle size distribution is wide

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