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 2CaO.Al2O3.SiO2 - CaO.Al2O3. 2SiO2

L. Kosa, O. Žigo, K. Adamkovičová, and I. Proks

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

 

Abstract: Using a precursor method the melt of eutectic composition in the system 2CaO • Al2O3 • SiO2 - CaO • Al2O3 • 2SiO2 (30.34 mass % CaO; 36.91 mass % Al2O3 ; 32.75 mass % Si02 ) and one of the products of its crystallization, viz. CaO • Al2O3 .2SiO2, were prepared. The temperature dependence of the spe­ cific relative enthalpy of the eutectic melt was determined using combination of the experimental data obtained in "drop" calorimeter and in the cal­orimeter for determination of heats of dissolution. The temperature depen­ dences of the specific relative enthalpy of the products of crystallization of the eutectic melt (these products being 2CaO •  Al2O3 • Si02 (gehlenite) and CaO •  Al2O3 • 2Si02 (anorthite)) were determined on the basis of literature data and the measured value of the specific heat of dissolution of CaO • Al2O3 • 2Si02 . On the basis of the values of the specific relative enthalpy of the eutectic melt and of the phases 2CaO • Al2O3  • Si02 and CaO • Al2O3 • 2Si02 related to the equilibrium temperature of crystallization of the eutectic melt 1658 К and from the material balance of the crystallization process the value of the specific enthalpy of crystallization of the eutectic melt was determined ∆hcryst(eut. melt; 1658K) = (- 441 ± 23) kJ kg-1 The error was determined on the level of significance equal to 95 %.

Full paper in Portable Document Format: 413a289.pdf

 

Chemical Papers 41 (3) 289–298 (1987)

Sunday, November 28, 2021

IMPACT FACTOR 2020
2.097
SCImago Journal Rank 2020
0.344
SEARCH
Advanced
VOLUMES
XXVIII. International Conference on Coordination and Bioinorganic Chemistry
© 2021 Chemical Papers