Metastable Phase Equilibria in the Aqueous Ternary Systems K₂B₄O₇-K₂SO₄-H₂O and K₂B₄O₇-KCl-H₂O at 273 K

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  • Zhang Tingting
    College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology
  • Yang Lei
    College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology
  • Zhang Wenyao
    College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology
  • Sang Shihua
    College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions
  • Cui Ruizhi
    College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology

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  • Metastable Phase Equilibria in the Aqueous Ternary Systems K<sub>2</sub>B<sub>4</sub>O<sub>7</sub>–K<sub>2</sub>SO<sub>4</sub>–H<sub>2</sub>O and K<sub>2</sub>B<sub>4</sub>O<sub>7</sub>–KCl–H<sub>2</sub>O at 273 K

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<p>The metastable phase equilibria for the ternary systems K2B4O7–K2SO4–H2O and K2B4O7–KCl–H2O at 273 K were studied using an isothermal evaporation crystallization method. The solubilities of salts and densities of solution in these systems were determined. According to the experimental data and the corresponding equilibrium solid phases, the metastable phase diagrams of the ternary systems K2B4O7–K2SO4–H2O and K2B4O7–KCl–H2O at 273 K were drawn and the density diagrams were constructed, respectively. Experimental results show that the two phase diagrams are both constituted of a eutectic point, two univariate solubility curves and two solid phase crystallization regions. The equilibrium solid phases at the eutectic point are K2SO4 and K2B4O7∙4H2O in the ternary system K2B4O7–K2SO4–H2O, and the equilibrium solid phases at the eutectic point are KCl and K2B4O7∙4H2O in the ternary system K2B4O7–KCl–H2O at 273 K. Therefore, the metastable phase diagrams for ternary systems K2B4O7–K2SO4–H2O and K2B4O7–KCl–H2O at 273 K both belong to a simple co-saturated type and neither double salt nor solid solution was formed.</p>

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