Desulphurisation ability of blast furnace slag containing high Al 2 O 3 and 5 mass% TiO 2 at 1773 K

Abstract

The sulphide capacities (C _S) of CaO–SiO₂–Al₂O₃–MgO–TiO₂ blast furnace slags were experimentally measured at 1773 K, and the percentages of free oxygen ions (O²⁻) and bridge oxygen (O⁰) of molten slag were calculated using molecular dynamics at 1773 K. The measured and calculated results were closely correlated with the change in CaO/SiO₂, MgO, and Al₂O₃ contents in the slag. The results show that C _S increases with increasing CaO/SiO₂ and MgO contents in the slag, but decreases with increasing Al₂O₃ content. The effects of O²⁻ and O⁰ on C _S were analysed using multiple linear regression, and results show that sulphide increases with the increase in the mass percentage of free oxygen and decreases with the increase in the mass percentage of bridge oxygen.