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The processes of phase formation in the ternary system CaO–Al2O3–ZrO2 under conditions of high-temperature solid-phase reactions as applied to the production of refractory high-alumina cements were studied. It has been established that in mixtures of “chalk – technical alumina – zirconium oxide” when heated to 900°C, rapid decomposition of CaCO3 occurs and the resulting CaO interacts with Al2O3 to form C12A7. At 1000-1100°C, the appearance of the ternary compound 7CaO*3Al2O3*ZrO2 is recorded in reaction mixtures. It has been shown that firing the raw mixture at 1200-1400°C allows obtaining high-alumina clinker with predominant phases CA2, CA and C7A3Z; CaZrO3, Al2O3 and ZrO2 are present in small quantities in the roasting products. The introduction of aluminum oxochloride AlOCl into the mixture accelerates the mineral formation processes.
high alumina cement, zirconium oxide, calcium aluminum zirconate, clinker formation.
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