... minerals, quarry, abrasive, cement, refractory materials, alumina, quartz sand, and emery, glass and so on. The materials fall into the impeller from ... to the national standards, such as “sand for construction” and “cobble and broken stones for construction”.7. It features of fine ... is little.8. When used along with the rod mill and ball one, it can simplify the flowing process, lessen the energy ...