Search

Background. The study of complex water-salt systems is one of the urgent tasks of inorganic chemistry. It is necessary to establish regularities in the state of phase equilibria and their solubility, which determine the optimal conditions for the processing of polymineral natural and complex technical raw materials. Purpose. Determination of possible phase equilibrium in the five-component system Na,Ca//SO4,CO3,НCO3-H2O, at 75 °С, construction of its closed phase diagram by translation and fragmentation of the constructed diagram by divariant fields. Methodology. The phase equilibrium in the Na,Ca//SO4,CO3,HCO3-H2O system at 750 °C were studied by the translation method, which follows from the principle of compatibility of structural elements of n and n+1 component systems in one diagram. Originality. The possible phase equilibrium in the five-component system Na,Ca//SO4,CO3,НCO3-H2O at 75 ° С were determined by translation, followed by the construction of its closed phase diagram (phase complex) and the construction of the diagram is fragmented by the crystallization regions of individual equilibrium solid phases. Findings. The method of translation is used to predict phase equilibrium on geometric images of the five-component system Na,Ca||SO4,CO3,HCO3-H2O at 75 °C and its phase complex diagram at a given temperature was first constructed. The constructed phase complex of the studied system is fragmented by divariant fields. It was established that the system under study at 75 ° C is characterized by the presence of 12 invariant points, 30 monovariant curves, and 27 divariant fields. [ABSTRACT FROM AUTHOR]