Effect Of Materials On Grinding Mill

Effect Of Materials On Grinding Mill

Effect of material properties on grinding mill mechanism powder

Summary of contents: The efficiency and quality of the grinding mill mechanism powder, in addition to its own product quality, working environment, the nature of the material is also an important factor, and the properties of the material mainly include: adhesion, cohesiveness, Wetness, etc. The efficiency and quality of the grinding milling mechanism powder is not only related to its own product quality and working environment, but also the nature of the material. The properties of the material mainly include: adhesion, cohesiveness, wettability, etc. The specific characteristics are as follows.

1. Adhesion. When grinding, classifying, transporting and storing granular materials, there is adhesion between the particles and between the material and the wall of the tube. This property tends to make the material flow poorly, the feeding is uneven, or the agglomeration, sticking to the bottom or even Arching and clogging, such as reducing the grinding efficiency due to material adhesion in the grinding pulverizer, the resistance is increased due to adhesion in the conveying pipeline, the conveying amount is reduced, and even the pipeline is clogged.

There are many factors that affect adhesion, mainly the effect of the forces between the particles and between the particles and the grinding mill. These forces include: structural forces interlaced between particles, residual energy attraction on the surface of the particles, intermolecular forces of the micropowder, capillary forces that absorb moisture, microcracking forces, and electrostatic attraction. These forces may work at the same time, but with different degrees of influence on different materials and different particle size characteristics. When the particle size of the material becomes smaller and the specific surface area increases, the adhesion tends to increase. When the void ratio of the same material decreases, the adhesion increases, and when the hygroscopicity of the material increases, the adhesion generally increases. Big.

2, cohesive. Due to various factors, the tiny particulate material causes the particles to collide with each other to cause the particles to agglomerate. This property is unfavorable for the classification of the material and the suspension of the powder, but it is often advantageous for the dust collecting effect of the mill.

3. Wetting. The property of the particulate material particles to be wetted by water or other liquids is called wettability. Generally, the particulate materials are classified into two types according to the degree to which they can be wetted by water, and are classified into hydrophobic materials and hydrophilic materials. Generally, a liquid having a small surface tension easily wets the surface of the material particles. When the powder particle is less than 5 μ m, since its surface is covered with a gas film, it hinders the adhesion and agglomeration between the particles and between the particles and the liquid, so that the wettability thereof is lowered.

4. The chargeability of the material. In the production process, the particulate material is charged by the action of impact, friction and corona discharge in the electric field. After the material is charged, its physical properties will change. In the electric precipitator, it affects the efficiency of vacuuming. In the grinding grinding machine, it has an effect on the grinding efficiency.

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