Then, how can the mine owner choose the vertical roller mill suitable for his own concentrator from many kinds.The type and particle size of materials affect the selection of vertical roller mill.Different material types will have different hardness and structure, which primarily limits the selection of LM vertical roller mill.

Generally, the hardness of materials is expressed by Mohs hardness, which is divided into 10 levels. The greater the Mohs hardness number, the harder the ore will be and the more difficult it will be to mill. At the same time, it will also bring relatively serious wear to the vertical roller mill itself.

For example, the hammer vertical roller mill is more suitable for handling low hardness and brittle materials, while the cone vertical roller mill is more suitable for materials with medium hardness or above, so its milling force and wear resistance are also more strict.