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, Shandong calcium - barium compound deoxidizer for the next furnace smelting Early use as part of the slag, and then blowing the end of the pre-pour, re-slagging. Pros: The next pre-lime furnace melting faster, accelerate the formation of the initial slag, Liaoning calcium - barium compound deoxidizer, improving dephosphorization, desulfurization rate and the furnace thermal efficiency; while reducing the consumption of lime to 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% 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, calcium - barium compound deoxidizer, when no liquid furnace slag blended with molten iron is available, to avoid triggering a splash. 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.