Capacity Hardness Sizes And Specifications To Grind Limeston. tube mill for grinding of limestone,calcined limestone powder grinding machine. clirik grinding millgrinding machine is for super-fine grinding materials with hardness less than 6 in mohs scale and humidity less than 6 percent such as kaolin, limestone, basalt, calcite, marble, talcum, barite, gypsum, dolomite, bentonite mud, mica ...