Liquid phase nano powder body and preparation method of nano particle agglutinative structure material

Abstract

The present invention discloses a nano powder body and nano particle aggregative structure material preparation method. Said method can regulate and control grain size of nano particle, can make saidmaterial possess uniform grain size, good dispersion property and high yield. Its equipment is simple, and consumption is less. Said method mainly includes the following steps: continuously feeding reactant solution into quickly-mixing reaction precipitation equipment, and continuously discharging the precipitate-contained slurry material from said equipment, then making the slurry material undergo the processes of cleaning, filtering or ageing, cleaning and filtering, drying, heat treatment, pulverizing and packaging. Said method can be used for producing various nano powder body and nano particle aggregative structure materials.

Description

technical field [0001] The invention relates to a liquid-phase chemical reaction precipitation method for preparing nanoparticle powder and a material with nanoparticle aggregation structure. Background technique [0002] The common process characteristics of the liquid phase precipitation method are: using a stirred tank for the mixed reaction, at least one reactant solution is gradually added by dropping, inflowing or spraying over a long period of time. Although the preparation of nanoparticles and materials with nanoparticle aggregation structure by this process has the advantages of simple operation, low cost and high yield, it is recognized that this method has three disadvantages: ① difficult to control the particle size; ② difficult to control the particle size ③ The hard agglomeration between the nanoparticles of the powder is difficult to eliminate. The root cause of the disadvantage of the stirred tank process is that one of the reactant solutions is added for to...

AI Technical Summary

Problems solved by technology

Although the preparation of nanoparticles and materials with nanoparticle aggregation structure by this process has the advantages of simple operation, low cost and high yield, it is recognized that this method has three disadvantages: ① difficult to control the particle size; ② difficult to control the particle size very small; ③ hard agglomeration between nanoparticles of powder is difficult to eliminate

The disadvantage of this method is: a carrier solution that has nothing to do with the chemical reaction is added, and the reactant solution is added in a periodic intermittent pulse. These measures complicate the operation.

The disadvantage of this method is: the solution relies on supergravity to pass through the packed bed, and the strength to quickly form a fresh interface between the two reactants is not enough, so it is difficult to effectively control the particle size

[0005] In the CN01106279.7 patent application, the applicant has provided a non-stirred tank method: the reaction solution is continuously fed into the dynamic, fast and orderly mixed reaction precipitator of the micro-liquid mass, and the micro-liquid mass is quickly mixed in the form of turbulent flow. Reaction and precipitation, the reaction zone is arranged in an orderly manner along the direction of the liquid flow, the precipitation slurry continuously flows out of the mixed reaction precipitation equipment, enters the cleaning and filtration process, and then performs other post-processing links (such as drying, heat treatment, crushing, etc.), this method The prepared nanoparticles have a small and uniform particle size, and the hard agglomeration between particles is eliminated. The disadvantage of this method is that a dynamic rotor is used, which is not conducive to equipment maintenance and cleaning and the simplification of parameter regulation.

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