The three-ring medium-speed micro-powder mill is currently the most advanced fine grind- ing equipment for dry non-metallic ultra-fine powder in domestic market.The crushing of materials and the classification of powder are placed in the same body and operate inde- pendently.It has the characteristics of compact structure,adjustable product fineness from 1400-3000 mesh,easy maintenance,low energy consumption per unit product,and low investment.The crushing and grading of materials to finished products are carried out in a closed system.The dust-containing gas is treated by dust removal and does not cause pollution.It is an ideal equipment for green and environmental protection.