... processing superfine powder of over 300 noninflammable and non explosive materials with Mohs hardness below Grade 8 and water ... field of middle and small scale mine ,chemical industry, building materials, such as barite, calcite, potash feldspar, steatite, marble ... ore, titanium ore, copper mine, chrome ore, refractory materials, heat preservation materials, coal coke, coal fines, black, , bone meal, ...