The character of concentrate iron: Iron in nature is mainly of the iron oxide and sulfide, and are mainly of divalent and trivalent, and trivalent compounds is the most stable. Magnetic iron ore is the most important basic structural material.Almost all large scale iron ore in china are rich in elements, for example, panzhihua iron ore containing rare earth; daye iron mine containing copper, cobalt and gold;dadingshan iron ore containing tin, etc.Ferroferric oxidecan improve the friction function of final product and have shading effect
