The three-way valve plate of the vertical roller mill is not flexible. It is often open or because of the high moisture content of the material. After the valve plate is removed, the system leaks seriously, causing slag spit.

The hot air pipe at the inlet of vertical roller mill is due to material deposition, resulting in a small flow of gas entering vertical roller mill, and insufficient air flow, causing slag spit.

Regularly repair the nozzle ring and grinding disc ring, repair the damaged cover plate on the nozzle ring, and replace the guide cone, the grinding roller skin and the grinding disc liner in time.