METHOD OF DESULFURIZATION OF LIQUID CAST IRON Russian patent published in 2002 - IPC

FIELD: ferrous metallurgy. SUBSTANCE: desulfurization of liquid cast iron is performed using high-basicity liquid ladle slag and powder desulfurizer. Method is distinguished by that high-basicity liquid ladle slag formed during out-of-furnace treatment of molten steal and containing (wt %) CaO 45-70, SiO₂ 2-17, MgO 4-8, Al₂O₃ 14-22, FeO 0.5-6 and the rests of metal melt are loaded immediately after tapping of steel melt together with remaining amount of steel into hot-metal ladle car. High-basicity liquid ladle is flooded with liquid cast iron at 1250-1400 C. After vigorous agitation of the two components, they are subjected to treatment with powder desulfurizer blown in by a flow of carrying gas for further vigorous agitation of cast iron and ladle slag. EFFECT: reduced desulfurization process time and reduced total amount of slag at steel-smelting plant. 3 cl