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

Calculation of surfaces of liquidus and of isotherms in the phase-diagrams of the ternary-systems NaCl-NaF-Na₃FSO₄ and NaCl-Na₂SO₄- Na₃FSO₄

J. Gabčová, M. Malinovský, and P. Kottáš

Department of Chemical Technology of Inorganic Substances, Slovak Technical University, CS-812 37 Bratislava

Abstract: Phase diagrams of the ternary systems NaCl—NaF—Na₃FS0₄ and NaCl—Na₂S0₄—Na₃FS0₄ were investigated by the thermal analytical method. It was found that both systems are of simple eutectic type with one eutectic point. Coordinates of the eutectic points are following: The system NaCl—NaF—Na₃FS0₄: 62.0 mole % NaCl, 11.4 mole % NaF, 26.6 mole % Na₃FS0₄; T(E) = 898.2 К (625 °C). The system NaCl— Na₂S0₄—Na₃FS0₄: 54.6 mole % NaCl, 31.8 mole %  Na₂S0₄, 13.6 mole % Na₃FS0₄; T(E) = 869.2 К (596 °C). Calculation of the surfaces of liquidus and of the isotherms of the phase diagrams was carried out under the assumption that the compound  Na₃FS0₄ partly thermally dissociates under melting.

Full paper in Portable Document Format: 402a177.pdf

Chemical Papers 40 (2) 177–185 (1986)