Redox Behaviour Of Selenium In Industrial Soda-Lime-Silica Glasses

A thermodynamic model for the calculation of the redox distribution of polyvalent elements which is based on the balance of chemically bonded oxygen in glass melts has been applied to the redox reaction of selenium. A set of reliable thermodynamic data of the selenium oxidation reaction has been derived using results of electrochemical, optical and wet-chemical investigation. Calculation results showed that selenium is reduced during cooling by iron as well as by sulfur.