Abstract
The sulphide capacities of CaO-Al2O3, CaO-Al2O3-MgO and CaO-Al2O3-SiO2 slags were studied at 1823 to 1923K to estimate the sulphur distribution ratio between secondary steelmaking slag and liquid steel.
From the obtained results, it was confirmed that substitution of MgO or SiO2 for CaO at a given NAl2O3 decreased the sulphide capacities in both systems of CaO-Al2O3-MgO and CaO-Al2O3-SiO2. The evaluated maximum values of sulphur distribution ratio for both slags were higher than 1000 at 1873K on the condition of CaO-saturation if the dissolved aluminium content in steel was assumed to be 0.01mass%.
