Roller mill application for high moisture feed

Vertical roller mills are known to be excellent drying machines. This is due to the fact, that the grinding material is in contact with the hot gas during the grinding and classification process. Considering critical physical and technical aspects, a stable operation of a grinding plant can be achieved even for raw materials with more than 20% of feed moisture without a pre-drying-system. The authors discuss the throughput parameters for a cement roller mill, the lay-out and sizing of the mill, materials selection, the mill gear reducer, industrial application, the raw material feeding system, and operation of the plant.