... ball billet, is widely used in metallurgical, chemical, coal and refractory industry. It after several improvements, especially ... pulverized coal, iron, coal, aluminum, iron, iron oxide, carbon powder, charcoal powder, slag, gypsum, tailings, sewage sludge, kaolin, activated carbon, coke ... ash, slime, powder metallurgy, sea Kam iron carbon products, such as material effect obviously extraordinary role. ...