ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Determination of the enthalpy of crystallization of eutectic melt in the system CaO.Al₂O₃.2SiO₂-CaO.SiO₂

K. Adamkovičová, L. Kosa, I. Proks, and I. Tarina

Institute of Inorganic Chemistry, Centre for Chemical Research, Slovak Academy of Sciences, CS-84236 Bratislava

Abstract: Melt of the eutectic composition in the system CaO • Al₂0₃ • 2Si0₂ —CaO Si0₂ (33.9 mass % CaO; 18.7 mass % Al₂0₃; 47.4 mass % Si0₂ ) was prepared by heating of oxide precursor. The temperature dependence of the specific relative enthalpy of the eutectic melt was determined using combina­ tion of the experimental data obtained in "drop" calorimeter and in the calorimeter for determination of heats of dissolution. On the basis of the values of the specific relative enthalpy of the eutectic melt, anorthite and wollastonite at the equilibrium temperature of crystallization of the eutectic melt at 1580 К and from the material balance of crystallization of this melt the specific enthalpy of crystallization of the eutectic melt was determined ∆ h_cryst(eut. melt; 1580 K) = (-297 ± 14) kJ kg^-1 The error was determined on the level of significance equal to 95 %.

Full paper in Portable Document Format: 434a481.pdf

Chemical Papers 43 (4) 481–487 (1989)