Determine the required vertical roller mill model and milling level according to the incoming and outgoing material particle size.Different types of vertical roller mill feed ports are different, and their model size also determines the size of the feed port, which requires the vertical roller mill manufacturer to produce according to the particle size of the material to be milled by the concentrator.If the content of coarse particles (large dry outlet size) in the feed is high, the required milling is relatively large, which will affect the productivity and cause blockage to a certain extent; When the content of fine particles (close to or less than the outlet size) is large, the milling to be realized is relatively small, so its productivity will be improved accordingly.