Kinetics of Solid Titania Reduction by Carbon in Liquid Iron

抄録

To clarify the mechanism of TiO₂ reduction by Fe-C melt, effects of carbon and sulfur contents in liquid iron and temperature on the reduction rate of solid TiO₂ were examined at temperatures of 1 350 to 1 550°C under argon atmosphere.
The reduction rate of solid TiO₂ was proportional to the activity of carbon in liquid iron, while it decreased by the addition of a small amount of sulfur to the liquid iron. An apparent activation energy for TiO₂ reduction by carbon was calculated to be about 400 kJ mol^-1.
It was concluded from these experimental results that the overall rate of TiO₂ reduction was controlled by the rate of chemical reaction step at the solid TiO₂-liquid iron interface. The decrease in reduction rate of TiO₂ by the addition of sulfur to the liquid iron was attributed to the decrease in effective reaction area by the adsorption of sulfur to the interface.