The main element is generally higher melting point alloy, or its oxide is difficult to restore steelmaking slag agent production plant, it is difficult refining pure metal, if it is easier to restore together with iron smelting. Used in the iron and steel smelting iron alloy, wherein the iron not only harmless, but because the anti-fusible molten steel is more favorable. Therefore, the process of steelmaking deoxidation and alloying of steel slag agent prices, mostly added in the form of ferro-alloys. Buying steel alloy generally very brittle slag agent, it can not be used as a metal material. Ferroalloy basic purposes: basic classification. Ferroalloy variety, classification method is also more generally classified according to the following methods: Press ferroalloy main element classification, mainly silicon, manganese, chromium, vanadium, titanium, tungsten, molybdenum and other alloy. Classification according to the carbon content of the alloy, high-carbon, medium carbon, low-carbon, low carbon, ultrafine carbon and other varieties.