... 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, ... , manganese ore, titanium ore, copper mine, chrome ore, refractory materials, heat preservation materials, coal coke, coal fines, black, , bone meal, ...