vertical roll mill for coal grinding
Vertical roller mill - ZGM - BEIJING POWER EQUIPMENT GROUP ... vertical for coal grinding high-speed. ... 1950's Construction of rolling ball type mill (E type mill ) 1960's Production of plate type mill 1970's Manufacture of rolling ball type mill (ZQM series) 1980 Start to manufacture of roller type mill (ZGM series) 1985 MPS mill license agreement with DEUTSCHE BABCOCK 1991 …