... mill can grind these materialswhose Moths hardness is below 9 class, and humidity is below 6%., and theyshould be nonexplosive and nonflamable ... . There are thousands materials our machinecan grind, and here are some of them and they are just for you consultation.They ... are cement(raw meal and cement clinker), quartz, feldspar, calcite, gypsum,limestone, dolomite, ...