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 Deoxidants calcium aluminosilicate for next smelting furnace as part Early use of slag, then the end of the pre-blowing when poured again slagging. Pros: The next pre-lime furnace melting faster, accelerate the formation of the initial slag, improve 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, when no liquid furnace slag blended with available calcium aluminosilicate Hebei iron Deoxidants, to avoid triggering a splash. Effect of slag foaming factors: the amount of gas into the slag: slag foam which is external conditions, the more gas per unit of time into the slag, the higher the degree of foaming slag calcium aluminosilicate Deoxidants Shandong, for example, the mid-blowing decarbonization speed Wuhan calcium aluminosilicate Deoxidants produce gas capacity, prone to slag serious bubble phenomenon. That in itself foaming slag in the slag gas retention time: This is foamed slag internal conditions, it depends on the viscosity and surface tension of the slag. The smaller the surface tension of the slag, the more easy to increase the surface area that is smaller bubbles that make them more easily into the foam; increase the viscosity of the slag, the merger will increase bubbles grow and escape from the slag resistance, slag bubble The increased stability.