Refining: the steel-making furnace (converter, electric furnace, etc.) over the beginning of the refining of molten steel to another container for steel refining process, also known as secondary metallurgy. So the steelmaking process into two steps early smelting and refining. First Lian: charge in an oxidizing atmosphere furnace melting, dephosphorization and decarbonization and the main alloying. Double slag slag is out on leave after the steel-smelting furnace of high alkalinity, high iron, high temperature, good mobility part of the final slag left in the converter, for the next part of the initial smelting furnace slag for use, Liaoning refining Steel deoxidizer, and then blowing the end of pre-poured again slagging. Pros: The next pre-lime furnace melting fast, steelmaking deoxidizer, accelerate the formation of the initial slag, Zhejiang steelmaking deoxidizer, improving dephosphorization, desulfurization rate and the furnace thermal efficiency; while reducing the lime consumption, reduce iron loss and oxygen consumption. Dual residue remaining slag suitable for blowing high phosphorus (w [P]> 1%) of hot metal, the dephosphorization rate of about 95%, Tianjin steelmaking deoxidizer, desulfurization rate of up to 60 to 70% . Note: The remaining slag operation, the first to be added before the hot metal scrap thickening condensation slag, when no liquid furnace slag blended with molten iron is available, to avoid triggering a splash.