Selective grinding mode in a MVR 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 mill parameters are set depending on the liberation characteristics of the ore. The resulting product is separated from the process gases in the downstream filter or cyclone. In the ”selective“ grinding mode, hard material from the host rock that carries no grade is removed with grit extraction and the fines leaving the classifier are the liberated high-grade material. This mode uses the physical properties of the feed material.