Measurement of solid-liquid equilibria in quaternary system Li⁺, K⁺//SO₄ ^2–, B₄O₇ ^2–-H₂O at 288 K

Abstract

In order to utilize the brine resources in China, the solid-liquid equilibria in quaternary system Li⁺, K⁺//SOO₄ ^2–, B₄O₇ ^2–-H₂O at 288 K was studied by the isothermal solution equilibrium method. Solubilities and densities of solutions were determined experimentally. According to the experimental data, the equilibrium phase diagrams, density-composition diagram and corresponding water content diagram of the quaternary system were plotted. Double salt KLiSO₄ was found in the reciprocal quaternary system Li⁺, K⁺//SOO₄ ^2–, B₄O₇ ^2–-H₂O at 288 K. The quaternary system has three invariant points, seven univariant curves and five fields of crystallization. The five crystallization regions correspond to Li₂B₄O₇·3H₂O, Li₂SO₄·H₂O, K₂B₄O₇·4H₂O, K₂SO₄ and KLiSO₄, respectively. The crystallization field of salt Li₂B₄O₇·3H₂O is the largest, whereas that of Li₂SO₄·H₂O is the smallest. The experimental results show that Li₂SO₄·H₂O has a strong salting-out effect on other salts.

Keywords

Solid-liquid equilibria / Borate / Double salt / Salting-out effect

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