The interaction between slowly reacting components of batch i.e. quartz, K-feldspar and Al_2O_3 and alkalies carbonates was studied. Processes occurring at the minerals and carboantes interface were investigated. Corrosion of the minerals surface, migration of chemical components and formation of layer of carbonates enriched in SiO_2 and Al_2O_3 was determined. Rate of this layer formation and its thickness and composition are dependent on the rate of interaction of alkalies on the mineral surface. Deep diffusion of Na into K-feldspar accelerating its melting was observed.
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