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We have carried out some laboratory experiments to establish possibilities to melt 16Na2O*10CaO*74SiO2 glasses from consisting of mainly quarz sands of Buir nuur lake. When the sands used directly, the formed glasses had slight blue colour, the origin of which may be connected with aluminium and iron impurities in the sands. Presence of these impurities is confirmed by chemical analyse and ESR study data. Allso have been studied liquid gas extraction phenomena in the sands and melted glass samples and determined some physical properties of them.
Literature data on the effect of water on the glass transition in silicate melts are gathered for a broad range of total water content cw from 3 × 10-4 to 27 wt%. In terms of a reduced glass transition temperature Tg*=Tg/TgGN, where TgGN is Tg of the melt containing cw?0.02 wt% total water, a uniform dependence of Tg* on total water content (cw) is evident for silicate melts. Tg* decreases steadily with increasing water content, most strongly at the lowest water content where H2O is dominantly dissolved as OH. For water-rich melts, the variation of Tg* is less pronounced, but it does not vanish even at the largest water contents reported (?27 wt%). Tg* vs. cw is fitted by a three-component model. This approach accounts for different transition temperatures of the dry glass, hydroxyl and molecular water predicting Tg* as a weighted linear combination of these temperatures. The required but mostly unknown water speciation in the glasses was estimated using IR-spectroscopy data for hydrous sodium trisilicate and rhyolite.