Ferroalloys: In simple terms, is the use of blast furnace blast temperature and reducing atmosphere is made of the alloy ferroalloy ore reduction. In the blast furnace ferroalloys mainly carbon ferromanganese; the furnace with energy as a heat source, as a reducing agent with carbon ferrosilicon grain plant, while reducing power of carbon is enhanced with increasing temperature ferrosilicon grain, so much more difficult to restore oxides such as CaO, Al2O3, rare earth oxides, etc. can restore them in reducing electric furnace. The main method of ferroalloy production: classification by operating methods and processes. No slag. No slag smelting iron alloy is the use of a carbonaceous reductant, silica or reconstituted alloy as raw materials, continuous smelting reduction furnace, products such as ferrosilicon, industrial silicon, silicon-chromium alloy. There slag. There ferroalloy smelting slag in the reduction furnace or electric furnace refining ferrosilicon grain prices, choose a reasonable residue type system and alkalinity production ferroalloys, iron slag than by its different varieties and material condition of the corresponding use of other factors, is generally 0.8 to 1.5.