Ways to Reduce the Interaction between Glass Melt and Refractory
Volume 3, Issue 2, Pages 69 - 72
Glass as a mass product is indispensable in daily life. The different properties and qualities are defined by the application of the finalproduct. However, at each glass furnace exists degraded material due to the interaction of the refractory and the glass melt. It is necessary to reduce this as a consequence of rising prices for raw materials and energy. The optimisation of the existing refractory by changing the composition (e.g. the ZrO2 weight percentage) will be the non-economical way. An alternative solution is the creation of an oxygen depression in the pores of the bricks. Based on this theory the surface tension of the glass melt increases and slows down the process of corrosion. Therefore a decrease of degraded material is possible due to the minimisation of bubbles and stones in the glass melt. Such an oxygen depression can be generated by materials with a high electronegativity. Crucible tests were done on an industrial corundum brick in contact with sodium silicate glass. Three characterisation methods to specify the corrosion effect were used. Different types of refining methods were used and described. They show that it is possible to decrease the process of corrosion by an economically after-treatment.
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