CALCULATION OF MELTING CURVES OF MULTI COMPONENT SILICATE SYSTEMS

The work is devoted to the study of non-equilibrium processes of melting silicate systems with varying silica content from 50 to 99%. The calculation of the melting curves of materials based on the actual chemical composition and determination of their melting temperature using state diagrams was carried out. Melting curves were constructed for the analysis of non-stationary processes investigated raw materials using a consistent method of melting eutectics and their comparison with the melting curves, created by traditional method whereby the conversion to the ternary system. Principles of the melting curves for materials taking into account their actual chemical composition are reduced to consider all options for the binary and ternary systems included in the studied multicomponent. Further eutectic arranged to increase the melting temperature and the amount of liquid phase is determined for each of them. With increasing temperatures the formation of the liquid phase is not due to eutectic melting followed by dissolution refractory components. According to calculations, the melting point of the raw material increases with the content of silicon oxide It was confirmed by experimental research by comparison of the phase diagrams of equilibrium processes and by the formation of a melt of multi-component systems and their real chemical composition. It was found that during slow heating rates both in the real and in model systems the increase in the liquid phase is carried out by melting eutectics and further by melting the refractory components. The melting experiments carried out on silicate systems using the plasma energy (fast blend heating) revealed the melt preparation connects with the simultaneous melting of all phases.