The main motor drives the grinding disc to rotate through the reducer, and the wind enters the mill from the air inlet. The coal gangue falls on the center of the grinding disc through the discharge port of the screw feeder. Under the action of centrifugal force, the coal gangue moves evenly from the center of the grinding disc to the edge. When passing through the grinding roller area on the grinding disc, it is crushed by the grinding roller. Large pieces of material are directly crushed, and fine particles are squeezed to form a material bed for inter-particle crushing. The crushed material continues to move to the edge of the grinding disc until it is taken away by the strong airflow at the wind ring, and the larger particles fall back onto the grinding disc to continue to be crushed. When the material in the airflow passes through the upper separator, the coarse particles return to the grinding disc for grinding under the action of the separator blades. Qualified fine powder is discharged from the mill with the airflow and collected by the system's powder collector. The collected powder is the product of the vertical mill. When iron blocks and other debris mixed in the materials move to the edge of the grinding disc with the materials, they cannot be blown up by the wind due to their own weight and fall into the lower cavity of the mill. They are scraped into the slag discharge port by the scraper installed at the bottom of the grinding disc and discharged out of the machine.