Abstract
The sulfide capacities of the CaO-Al2O3, CaO-Al2O3-CaF2, CaO-Al2O3-SiO2-CaF2 and CaO-Al2O3-SiO2-MgO slags were determined at 1873K to estimate sulfur distribution ratios between these slags and molten steel in the secondary refining process.
In prior to the sulfide capacity measurement, equilibrium constant for the reaction of sulfur dissolution into molten copper was investigated at 1673-1873K.
Substitution of MgO for CaF2 was found to be effective for desulfurization when CaO content of the slags was high, but the sulfide capacity considerably decreased when SiO2 was calculated with added slightly in the slags. In addition, the relationship between the sulfur distribution ratio and oxygen content in steel was calculated with the sulfide capacity.
