What factors will affect the working efficiency of the jet mill

Jet mill is a device that uses high-speed airflow for grinding. After compressed air is filtered and dried, it is jetted into the grinding chamber at high speed through Laval nozzles. At the intersection of multiple high-pressure airflows, the materials are repeatedly collided, rubbed, and sheared to be crushed. .

There are several factors that affect the working efficiency of the jet mill.

1.   Material characteristics. Generally speaking, the jet mill can be adapted to the crushing of all brittle materials. However, due to the different properties of the materials, their crushing performance is also different. Due to the difference in the strength, density, hardness, viscosity, shape and electrical properties of various materials, the difference in grinding results is inevitably caused, and the strength of the material is an important factor. In addition, because the moisture content of water or oil in some materials or air sources is too high, the properties of the abrasive material (such as the increase in toughness and viscosity) will affect the fineness of the grinding.

2.  Processing volume, the same material has different grinding fineness due to different processing volume. Generally speaking, the processing capacity is directly proportional to the particle size of the product. However, if the processing volume is too small, the chance of collisions between particles will be reduced, thereby affecting the fineness.

3.  The influence of back pressure, the back pressure is the average pressure of the gas in the crushing chamber. Since the spray speed of the crushing nozzle is mainly determined by the difference between the nozzle inlet pressure and the outlet pressure, the greater the pressure difference, the greater the flow rate. Therefore, the increase in back pressure is not conducive to polishing. In production, the increase in the resistance of the capture system will increase the back pressure of the jet mill and affect the grinding effect of the powder. Therefore, be sure to check the resistance of the capture system.