Kinetics of CO/CO2 Reaction with MnOx/TiOx-CaO-SiO2 Slags

Abstract

Knowledge of the interfacial reactions between CO/CO2 and transition metal oxide containing slags is more important to understand various metallurgical processes. The present research studied the kinetics of reaction between CO/CO2 and MnOx/TiOx containing Slags. Measurements of the rate of interfacial reaction between CO/CO2 and MnOx/TiOx -CaO-SiO2 Slags were made using 13CO2-CO isotope exchange technique. The dependence of rate constant with respect to the effects of oxygen activity, MnOx/TiOx content, slag basicity and temperature was discussed. It is found that the apparent rate constant increases with increasing MnOx/TiOx content, slag basicity and temperature and decreases while increasing oxygen activity. The apparent rate constants obtained for MnOx/TiOx containing slags show similar behavior to that of FeOx containing slags and the rates gradually increase for TiOx, FeOx and MnOx containing slags at same experimental conditions. The rate constant expressions for MnOx/TiOx containing slags are obtained by using a single charge transfer model. Comparison of calculated and measured rate constants shows that there is a good fit between the two, which implies that the single charge transfer model may be generally applicable.