LM-Y Vertical Pre-grinding Roller Mill is suitable for grinding block, granular, and powdered raw materials into the required sand and powder materials, and obtaining the desired particle size range after external sorting. Various non flammable and explosive mineral materials, including cement clinker, feldspar, calcite, barite, fluorite, rare earth, marble, ceramics, bauxite, manganese ore, iron ore, copper ore, phosphate ore, iron oxide red, slag, water slag, activated carbon, dolomite, granite, iron oxide yellow, coking coal, diamond sand, gold ore, kaolin, coal gangue, porcelain clay, fluorite, bentonite, vermiculite, pyrophyllite, basalt, etc., with a Mohs hardness of 7 or below and a humidity of 4% or below.