What are the factors related to the degree of pulverization of the jet mill?

Air jet mill is a kind of fine granularity among dry milling equipment, so it is favored by many industries. So to what extent can the jet mill be crushed? Generally speaking, the crushing range of the jet mill is between 1-74 microns. But it does not mean that it can be as thin as 1 micron, but is affected by many factors. Let’s take a look below.

The jet mill uses the kinetic energy of high-speed airflow to make particles collide and rub against each other to crush. It has the characteristics of continuous production process, large production capacity and high degree of automation. It can be used in a variety of fine processing industries, such as electronic materials, chemicals, mining, metal powder, etc.

To what extent can the jet mill crush? It is related to the following factors:

1.  For the initial fineness of raw materials, the jet mill generally requires the feed to be below 50 mesh.

2.  It is related to the physical properties of the material, the fluidity of the material and the uniformity of the particles are related. Some materials have poor fluidity, many impurities, and high solvent content. There may be material blocking during the production process. At this time, special equipment is needed to do this. Not all materials can be pulverized with standard equipment to achieve pulverization fineness. .

3.  It is related to the crushing pressure in the crushing process. The feed pressure of some equipment is greater than the crushing pressure, and the crushing pressure of some equipment is greater than the feed pressure. Specific materials need to be specifically designed.

4.  It is related to the feeding speed. Not all materials have good fluidity. Whether it is screw feeding or vibrating feeding, the feeding process is a very important factor. Some very fine materials are difficult to feed. , At this time, it is necessary to use a dedicated personalized configuration to achieve the feeding effect.

5.  There is also a relationship with the degree of optimization of the jet mill. There are many manufacturers of jet mills, but the fineness of the same material made by different manufacturers is different, even if it is made by different models of equipment from the same manufacturer. The fineness is also different, but according to experience, the effect of a larger crusher is better than a smaller one.

6.  It is related to the operation method of the operator’s proficiency. Some equipment requires a small and then large pressure operation to start up, and some are directly operated in one step.

It can be seen from the above that there are many factors that affect the limit particle size of the jet mill, the most important of which is the physical properties of the raw material. The drier and brittler the raw material, the finer the limit particle size that can be reached. For example, raw materials such as carbon powder and graphite have better brittleness. If you use a jet mill, you can easily obtain micron or even sub-micron fine powder.