Kinetics of Chromium Oxide Transformations in Glass Melting

The kinetics of chromium oxide transformations in glass batch under heating and in glass melt has been studied. The different degrees of transformation of CrO3 and Cr2O3 is demonstrated. The conditions of equilibrium between chromium oxides in the case of their simultaneous presence in glass melt is determined. The conditions of the interaction between chromium and iron oxides in the glass melt are investigated, including the surface layer in which an equilibrium between the colorant oxides can be achieved in accordance with the reaction conditions and the composition of the gaseous atmosphere. The low reaction velocities in the glass melt are due to its high viscosity and low values of diffusion coefficients.