SLAG REFORMING MATERIAL AND SLAG REFORMING METHOD USING CAO AND AL2O3

摘要

PURPOSE: To produce a slag reforming material suppressing the reduction of oxygen in the molten steel by preparing a slag reforming material in which the content of Al₂O₃, SiO₂, CaO, CaF₂, Na₂O or the like and grain size are specified, thereby making the m.p. of converter slag lower than the temp. of molten steel. ;CONSTITUTION: A slag reforming material having 5 to 50mm ϕ grain size contg. ≥60% Al₂O₃, 5 to 20% SiO₂ and 10 to 20% CaO and using ≤5% softening material such as CaFe₂ and Na₂O jointly is prepd. At the time of discharging steel from a converter 1 to a ladle 3, the slag reforming material and slag 5 for reforming consisting of CaO are charged to the ladle 3, and synthetically reformed slag 6 of CaO-Al₂O₃ base having a low m.p. (≤1600°C) is placed on the molten steel 2. Next, in the closing stage of the steel discharging, Al and CaO are charged thereto, and the slag is reformed to reduce the oxygen potential in the slag in the case of the completion of the steel discharging.;COPYRIGHT: (C)1994,JPO&Japio