... calcite, marble, limestone, kaoline, gesso, barite, coal ash and slag, etc.(2) Hard materials: carborundum, brown corundum, superfine cement, ... feldspar, a-alumina, glass fine bead, etc.(4) Metal powders: zinc powder, aluminum powder, iron powder, and molybdenum powder,Note: We have prepared ... gas will be discharged by induced draft fans. Fine Powder Ball Mill Production Line (CE CERTIFICATION)