Abstract
A model of dissolution of chromia in binary Na2O-SiO2 liquids is presented in this work. Data available in the literature on the acid/base properties and the chemistry of chromium in such liquids were used in order to refine the model. Physical phenomena such as migration of ions and the resulting electric field, the mechanical equilibrium of the liquid and the interface recession caused by the dissolution of chromia are also implemented in the model. Numerical simulation has been compared to experimental measurements of Na2O, SiO2 and Cr2O3 concentration profiles after 1 h of immersion of chromia in a (Na2O)0.25(SiO2)0.75 liquid at 1150 °C. The phenomena having a significant influence on the dissolution rate of chromia are highlighted in the last part of this paper.
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