Silica powder pulverizer, powder ultra-fine grinding, vertical pulverizer

Release time:

2024-10-06 09:14

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The ultrafine grinding methods of silica are mainly divided into two categories: physical and chemical methods.：

1.physical method

Physical methods mainly crush large particles of silica into ultrafine powders by mechanical force, and common physical methods include：

mechanical grinding method：Through mechanical equipment"Cell grinding" to carry out grinding, cell grinding through the grinding cavityhigh-speed rotating grinding media(such as zirconia ceramic microbeads) impact and shear silica particles, thereby reducing their particle size.This deviceLow production cost, high output, simple process, easy to achieve large-scale production. The mechanical grinding method can optimize the grinding effect by adjusting the parameters such as ball ratio, grinding concentration, medium ratio and medium filling rate.

high temperature melt injection method：High-purity silica or quartz is melted into a liquid in a high-temperature field, broken into mist-like droplets by spraying, and then cooled to form spherical silica particles with smooth surfaces. The particles prepared by this method are highly spherical but difficult to prevent secondary pollution, and the atomization particle size is difficult to adjust the plasma method.：The silica or quartz powder is melted by the high temperature zone generated by AC or DC arc plasma moment, and then spherical silica particles are formed by gasification and quenching.

Plasma legal class：: high particle purity, fast reaction rate, but there are difficulties such as high temperature field temperature is not easy to control.

2.chemical method

Chemical law Generate ultrafine silica particles by chemical reaction Common chemical methods include：

gas phase method：The silicon halide is gasified at a high temperature and then undergoes a vapor phase hydrolysis reaction with gas and oxygen to produce silica particles. The particles prepared by the gas phase method have uniform particle size and high purity, but the reaction process is difficult to control and the cost is high..

sol-Gel method：The raw materials and the liquid phase are uniformly mixed, and the gel is formed by hydrolysis and condensation reaction, and then the spherical silica particles of nano size are prepared by drying and sintering. sol-The particles prepared by the gel method have controllable particle size and good dispersion, but they have problems such as large shrinkage and easy formation of agglomerates during drying.

precipitation method：Silica particles are obtained by mixing substances of different chemical compositions and adding precipitants to generate precipitates, which are then washed, dried or calcined. The particles prepared by precipitation method have uniform particle size and simple process flow, but there are some phenomena such as low purity and easy agglomeration.

Grinding equipment and grinding aids In the process of ultrafine grinding, the choice of grinding equipment and the use of grinding aids have an important influence on the grinding effect. Commonly used grinding equipment includes stirring mill, air flow mill, medium stirring mill, etc. Grinding aids suchDA dispersant and sodium silicate can effectively improve the grinding efficiency and reduce the particle size of grinding products.

3.Application areas

Ultrafine silica powder has a wide range of applications, including but not limited：

Materials Science：As a filler, reinforcing agent for plastic, rubber, resin and other materials modification.

Pharmaceutical：As pharmaceutical excipients for the preparation of pharmaceutical preparations, such as glidants, anti-adhesive agents, adsorbents, etc.

Electronic：For the preparation of electronic components, semiconductor materials and other high-tech products.

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