Ferroalloy industry has experienced three periods: the ferroalloy industry modernization period. So far in 1960, gradually replacing the blast furnace and dominant. After 1960, silico-manganese plant, blast furnace ferroalloys production for the first time exceeded Buying silico-manganese ferroalloy production, and continue its rapid development. 1995 world steel production of about 340 million t, ferroalloy production of about 16 million tons, of which electric ferroalloy production reached more than 80%. Meanwhile electric equipment technology accelerates large-scale, fully enclosed of (semi-closed), mechanization and process control the pace of modernization, electric furnace gas cleaning and heat recovery to reach the practical stage, there has been pollution-free ferroalloy plant; computer controlled production process application and promotion. Ferroalloys purposes: as an alloying agent. Alloy steels it contains different alloying elements have different properties. The content of alloying elements in steel alloy by adding methods to adjust. Ferroalloy is used to adjust the content of alloying elements in steel alloying agent called. The alloying agents are commonly used silicon, manganese, chromium, molybdenum, vanadium, tungsten, titanium, cobalt, nickel, boron, niobium, zirconium alloy.