Equilibrium Constant - Determination And Influence On Redox Reactions In Soda-Lime-Silica Glass Melts

The iron, arsenic and chromium redox equilibrium in an oxide glass-forming melt has been studied quantitatively. The equilibrium constant K(T) and the thermodynamic standard values were determined for the redox reaction in the melt at temperatures between 100 and 1450 deg C. These values were compared with values from the literature. The equilibrium constant is dependent on the temperature and on the concentration of the polyvalent elements. Possibilities to determine the equilibrium constants of the various polyvalent elements are described.