The fine powder contained in the material also affects the production efficiency of vertical roller mill. Because these fine powder is easy to adhere, affecting the transport. When the fine powder is more in the material, it is easy to adhere to the equipment during grinding, which affects the transportation. For such materials with more fine powder, the sieve shall be conducted one time in advance. When the user demands the higher the particle size of the finished product, the smaller the grinding ability of vertical roller mill. Because the material needs to be ground in vertical roller mill for a longer time, the finished products produced in the same time are relatively small and the production efficiency is reduced. If you have high requirements for the material discharging granularity, you can add other equipment according to your own production capacity and economic strength to ensure the production efficiency.