Converter slag attack on refractories of the system MgO-ZrO2-CaO-SiO2

Addition of zirconia to basic refractory materials has beneficial influence on their mechanical properties. This fact stimulated us to prepare new ceramic material (called DZ) containing MgO, CaO, ZrO2 and SiO2. It was found that addition of DZ to the magnesia products improves their density and thermomechanical properties. Due to phase composition of magnesia-DZ materials an increase of corrosion resistance of this materials can be predicted. This contribution presents results of recent research on chemical interactions of converter stags on magnesia products containing 15% of DZ material. Various slag samples of different CaO/SiO2 molar ratio and different iron oxides content were applied in corrosion tests. The obtained results confirmed a good corrosion resistance of magnesia-DZ product. (author)