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<p>The underground brines in Sichuan Basin contain abundant major elements (e.g., Na, K, Mg, Ca, Cl) and high-value trace elements such as Li, Sr and Br, representing significant exploitable resources. Comprehensive investigation of their physicochemical properties is crucial for integrated resource development. This study systematically examined the phase equilibrium behavior of the quinary system NaBr–KBr–CaBr<sub>2</sub>–SrBr<sub>2</sub>–H<sub>2</sub>O and its quaternary subsystem NaBr–CaBr<sub>2</sub>–SrBr<sub>2</sub>–H<sub>2</sub>O at 298.15&#xa0;K using the isothermal dissolution equilibrium method. The ionic compositions of saturated solutions and corresponding equilibrium solid phases were experimentally determined, enabling construction of complete solid–liquid equilibrium phase diagrams at 298.15&#xa0;K. Thermodynamic modeling was performed using the Pitzer model with ion-interaction parameters obtained from the literature. Results demonstrate agreement between predicted and experimental solubility values, with close correspondence between calculated and experimental phase boundaries, confirming the model’s applicability. This work provides the first fundamental phase equilibrium dataset for K/Ca/Sr/Br-containing poly-component systems of Sichuan Basin brines.</p>

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Phase Equilibria of the Quinary System NaBr–KBr–CaBr2–SrBr2–H2O and Its Quaternary Subsystem NaBr–CaBr2–SrBr2–H2O at 298.15 K

  • 期刊论文

  • 发表日期：

    2026年4月13日

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  • Guoliang Nie,
  • Ruizhi Cui,
  • Hongbao Ren,
  • Shihua Sang,
  • Qiuye Yang,
  • Wu Li

摘要

The underground brines in Sichuan Basin contain abundant major elements (e.g., Na, K, Mg, Ca, Cl) and high-value trace elements such as Li, Sr and Br, representing significant exploitable resources. Comprehensive investigation of their physicochemical properties is crucial for integrated resource development. This study systematically examined the phase equilibrium behavior of the quinary system NaBr–KBr–CaBr2–SrBr2–H2O and its quaternary subsystem NaBr–CaBr2–SrBr2–H2O at 298.15 K using the isothermal dissolution equilibrium method. The ionic compositions of saturated solutions and corresponding equilibrium solid phases were experimentally determined, enabling construction of complete solid–liquid equilibrium phase diagrams at 298.15 K. Thermodynamic modeling was performed using the Pitzer model with ion-interaction parameters obtained from the literature. Results demonstrate agreement between predicted and experimental solubility values, with close correspondence between calculated and experimental phase boundaries, confirming the model’s applicability. This work provides the first fundamental phase equilibrium dataset for K/Ca/Sr/Br-containing poly-component systems of Sichuan Basin brines.