MECHANISM AND KINETICS OF Fe2O3 REDUCTION FROM SILICATE MELT BY CARBON MONOXIDE

Abstract

Most of the reactions of reducing gas (CO) interaction with an oxide melt flow in a mixed regime, which is realized at the comparable diffusion rates (υ) of the components to the point of the reaction and an adsorptive-and-chemical act. For the theoretical calculations of the rate it is necessary to fi nd the value υ in a kinetic regime. In assumption of electrochemical nature of interaction of reducing gas (CO) with an oxide melt, which contains metallic ions MenOm , a kinetic equation has been deduced for the calculation of the rate of a reduction process in the kinetic regime. The equation takes into account physical and chemical properties of interfacial phases. A good correspondence of the calculations and experimental data have been shown at the example of interaction of oxide melt system of CaO – SiO2 – Al2O3 containing up to 5.7 % (wt.) of Fe2O3 with a gas phase of carbon monoxide at partial pressure (5.0)102 MPa and 1623 K.