Acid-resistant articles made of granodiorite, felsite, and Buskul’skoe clay

The phase transitions that take place in firing of clay from the Buskul’skoe deposit, granodiorite from the Severskoe deposit, and felsite from the Pokrovskoe deposit and mixed clays with granodiorite and felsite in different ratios were investigated. The change in the content of crystalline phases (cristobalite, mullite, and quartz) in the initial materials and blends during firing was established by quantitative x-ray phase analysis.