De-dusting grinding mode in a vertical roller mill

The feed material is ground in the MVR vertical roller mill by pressure and shear forces, whereby the grain size of the product is adjusted via the mill's classifier. The parameters of the plant are set so that the ultrafines are removed from the product. The ultrafines are separated from the process gases in the downstream filter or cyclone. The classifier reject (classifier coarse) is the grade material; it is extracted via a chute or a screw conveyor. If required, the product is separated into a fine and a coarse fraction in a downstream SUV separator. The “de-dusting” grinding mode applies to ores where the ultrafines contain a low or nil proportion of grade material or where ultrafines are interfering with the downstream process. For example, clay material can be removed from the ore.