Ferroalloy production methods: extrajudicial furnace. After completion of the melting metal to be solidified, lift furnace tube, the new Si-Al-Ba-Ca, remove slag and iron ingots, the new Si-Al-Ba-Ca Tianjin, cooling good lighting blasted metal ingot, crushing, finishing the finished product. The main advantage of the device outside the furnace method is simple, can not produce an electric furnace capable of producing hard carbon reduction element or a metal alloy. Ferroalloy classification: Classification according to production method. There blast furnace ferroalloy, ferroalloy electric furnace, furnace extrajudicial (metal calorimetry) alloy, vacuum solid state reduction ferroalloy, converter ferroalloy, iron alloy electrolysis. Nitride products. Ferromanganese or ferrochrome powder used in high temperature conditions produced by nitriding nitride products. The main varieties are ferromanganese, ferrochrome nitride, and the like.