... iron, iron oxide, carbon powder, charcoal powder, slag, gypsum, tailings, sewage sludge, kaolin, activated carbon, coke powder and other powder, powder, waste, waste residue, ... powdered coke, iron oxide skin and dust ash, slime, powder metallurgy, sea Kam iron carbon products, such as material ... 2 mm; particles should be in the 30-40%; the maximum particle size should be less than 3mm of the particles ...