Behaviour Of Earth-Alkali Sulphates During Glass Melting (In Italian)

The sulphates of Mg, Ca and Ba, whose decomposition temperatures very considerably, are considered. An examination is made of their behaviour during the heating up of glasses and batch mixtures in order to evaluate whether there are any differences between the quantity of SO3 which passes into the glass and that released in the form of bubbles. The examination has been made as a function of temperature and time using analytical and thermogravimetric methods. An attempt has been made to verify whether the results obtained, which show a similar behaviour for the three sulphates considered at high temperatures, can be related to the refining action of the sulphates themselves.