Characteristics Acting as the inoculant and carburizer, it's widely used in the special steel smelting and precision casting process, especially meeting the requirement of high quality product and strict control of sulfur content in the ductile iron and grey iron casting industry. lt's also used as reducer agent in the nuclear reactor, the absorbent of heavy metal in the waste water treatment system and the raw material of graphite cathode in the aluminum electrolysis cell.