1988 Volume 74 Issue 11 Pages 2114-2121
Reduction rate of TiO2 in CaO-SiO2-Al2O3-TiO2 slags by carbon dissolved in iron melts was investigated at 1 350°C 1 600°C under argon atmosphere. It was found that the reduction of TiO2 proceeded simultaneusly with the reduction of SiO2 and was promoted by the addition of silicon to the initial iron melts. For acid slags, the reduction rate of TiO2 decreased with inceasing ratio of CaO/SiO2, whereas it slightly increased for slags with CaO/SiO2>1.
The kinetic analysis on the basis of the two film theory showed that the overall rate of transfer of Ti from slag to metal phases was controlled by the rate of chemical reactions at the interface for cases without silicon addition, but it was found that the resistance to transfer of TiO2 in the diffusion boundary layer at slag could not be neglected when some amount of silicon was added to the metal.
