1, mining machinery manufacturer can grind the following non-inflammable and non-explosive materials with the hardness below Scale 9.3 of Moh’s and the moisture content below 6%,such as:a) Minerals:limestone, calcite, barite, dolomite, potassium feldspar, marble, talcum, gypsum, kaoline, medical stone, rock phosphate,etc.b) Metallurgy..