Thermodynamics of Titanium Distribution Between Ferritic Stainless Steel and CaO–Al2O3–MgO–TiO2 Slag at 1823 K

Titanium distribution ratio ( L_Ti ) between Ti-bearing ferritic stainless steel (Ti-FSS) and CaO–Al2O3-based VOD slag was measured at 1823 K (1550 °C). Titanium oxide in the CaO–Al2O3–MgO–TiO2 slag exists as ‘ TiO_3^2- ’ complex and that the titanate capacity increases with slag basicity. However, L_Ti decreases with basicity due to a significant decrease in oxygen potential at slag-metal interface although titanate capacity of the slag increases. Hence, the highly basic slag is favorable to improve Ti yield.