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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)

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