Abstract
Achieving the highest degree of sintering of porcelain stoneware (W < 0.5%) is the main condition of obtaining highquality products with high resistance to the simultaneous action of mechanical and abrasive loads, aggressive reagents and signchanging temperature fluctuations. The main impact in this case is dependent upon quartzfeldspathic natural material. Unfortunately, domestic Ukraine’s deposits of feldspathes are almost exhausted, while the impact of alternative fluxes is not researched on the level of technological practice. For the stable functioning of domestic industry in the market economy it is crucial to expand raw materials base and solve energysaving problems. To solve the mentioned issues, it is required to find alternative fluxing materials, which should ensure the highest degree of sintering, and therefore complex high operational product properties, in conditions of energysaving quick sintering of technical porcelain stoneware.
 This study justifies the forecast estimate methodology of quartzfeldspathic materials’ usage efficiency taking into the account products’ sintering conditions. A set of theoretical and experimental studies was carried out, the results of which helped to determine the usage expediency of a range of domestic alkaline metasomatites in the production of technical porcelain stoneware tiles. The used approach to predicting the behavior of alternative raw materials made it possible to obtain data on their technological properties, in particular the characteristics of the melts formed under conditions of highspeed products firing at a temperature of 1200 °C: η = 102.05 ÷ 3.07 Pa·s, s = 0.304 ÷ 314 mN/m. The results of theoretical and experimental studies of the chemicalmineral composition and properties of six different occurrences of alkaline metasomatic rocks indicate the advisability of their use as an alternative to albite concentrates imported from Turkey. Obtained new data allowed to outline the transition ways from costly feldspathic concentrates to domestic substitutes, thus allowing to eliminate of import dependence of domestic producers of porcelain stoneware tiles and large format slabs.
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