Jet mill (jet mill) is an important equipment of superfine grinding, especially widely used in non metallic minerals and chemical raw materials of ultrafine grinding, solid content of products depends on the size limit of mixed gas stream, and inversely proportional to the unit energy consumption. In addition to fine particle size, the airflow pulverization product has the characteristics of narrow particle size distribution, smooth particle surface, regular particle shape, high purity, high activity and good dispersion. The compressed gas adiabatic expansion of Joule Thomson cooling effect in the grinding process, so it is also suitable for low melting point, heat sensitive materials of superfine grinding. Therefore, the requirements for the air compressor has become increasingly apparent, air mill (air mill) with the advantages of air compressor will be highlighted.