How does the jet mill do not heat up during processing?
Everyone knows that during the processing of mechanical equipment, heat is generally generated due to the friction between the equipment parts and the contact between the raw materials and the equipment, which causes the temperature to rise. For some heat-sensitive raw materials, how to control the processing time Temperature is the top priority. Especially during the crushing process, the temperature is the easiest to increase. How can the temperature be kept constant and not increase? At this time, a jet mill is needed. The jet mill is a representative product in the ultra-fine grinding equipment. It has outstanding performance in terms of processing fineness and efficiency. It is also a highlight of the jet mill that does not heat up during operation.
The kinetic energy source of the material particles in the jet mill is compressed gas. When the high-pressure gas accelerates and expands in the Laval nozzle, the pressure is converted into the kinetic energy of the material particles. When the particle size of the material is not uniform, the particle with the smaller mass will be faster, and the particle with the larger mass will be slow. Under the effect of the speed difference, the particles of different particle sizes will collide, thus making the particle size uniform; when the particle size of the material is more uniform When the high-speed jet is a typical turbulent flow, its flow state is not as uniform and stable as laminar flow, and there is violent momentum mixing in the direction of the main flow channel. Under the driving of the mixed flow, the material particles collide and rub evenly, and Obtain more uniform and refined particles.
In general, high-speed airflow expands and cools, even if a certain amount of heat is generated by friction, it will be taken away by the continuously entering airflow, so the temperature in the flow field is low, which makes airflow pulverization particularly suitable for processing heat-sensitive materials. The velocity field of the high-speed turbulence is relatively full and uniform, so the shearing effect of the airflow on the particles is also relatively uniform, and the particle size distribution of the obtained particles is narrow, and the particle shape is also ideal.
Jet mill is one of the most commonly used ultra-fine grinding equipment. It is widely used for ultra-fine grinding or fine grinding of talc, kaolin, barite, graphite, wollastonite, zircon and other non-metallic minerals and other brittle materials. The fineness of the product is generally up to 3-45μm.