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Abstract <p>To achieve efficient separation of lithium and potassium resources from the brines of the salt lake to provide a theoretical basis, this paper adopts the isothermal dissolution equilibrium method to study the solid-liquid phase equilibrium and phase diagram of the quaternary system (LiCl + KCl + LiB<sub>5</sub>O<sub>8</sub> + KB<sub>5</sub>O<sub>8</sub> + H<sub>2</sub>O) at 308.15 K and 0.1 MPa. The experimental results show that the phase diagram contains two invariant points, five univariate solubility curves, and four salt crystallization regions corresponding to KCl, LiCl·H<sub>2</sub>O, LiB<sub>5</sub>O<sub>8</sub>·5H<sub>2</sub>O, and KB<sub>5</sub>O<sub>8</sub>·4H<sub>2</sub>O, respectively. KB<sub>5</sub>O<sub>8</sub>·4H<sub>2</sub>O occupies the greatest part of phase region, while LiCl·H<sub>2</sub>O covers the smallest. These results indicate that KB<sub>5</sub>O<sub>8</sub> can be readily crystallized and separated from the system (LiCl + KCl + LiB<sub>5</sub>O<sub>8</sub> + KB<sub>5</sub>O<sub>8</sub> + H<sub>2</sub>O).</p>

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Solid–Liquid Phase Equilibrium of the Quaternary System (LiCl + KCl + LiB5O8 + KB5O8 + H2O) at 308.15 K and 0.1 MPa

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Jia-Hui Lv,
  • Hang-Yu Wang,
  • Sen-Jian Han,
  • Dong-Chan Li,
  • Hui-Fang Zhang,
  • Shi-Qiang Wang

摘要

Abstract

To achieve efficient separation of lithium and potassium resources from the brines of the salt lake to provide a theoretical basis, this paper adopts the isothermal dissolution equilibrium method to study the solid-liquid phase equilibrium and phase diagram of the quaternary system (LiCl + KCl + LiB5O8 + KB5O8 + H2O) at 308.15 K and 0.1 MPa. The experimental results show that the phase diagram contains two invariant points, five univariate solubility curves, and four salt crystallization regions corresponding to KCl, LiCl·H2O, LiB5O8·5H2O, and KB5O8·4H2O, respectively. KB5O8·4H2O occupies the greatest part of phase region, while LiCl·H2O covers the smallest. These results indicate that KB5O8 can be readily crystallized and separated from the system (LiCl + KCl + LiB5O8 + KB5O8 + H2O).