Abstract
The solubilities in the quaternary system (LiCl + NaCl + KCl + H2O) at 288.15 K were investigated with the method of isothermal dissolution equilibrium. The phase diagram includes one cosaturated point, three isotherm dissolution curves, and three crystallization regions corresponding to sodium chloride, potassium chloride, and lithium chloride dihydrate. The area of the crystallization region of LiCl · 2H2O is the smallest, and it has a strong salting-out effect to NaCl and KCl. Comparing the phase diagrams of the quaternary system at 288.15 and 298.15, 373.15 K, it was found that solid mineral LiCl · 2H2O at 288.15 K transformed to LiCl · H2O at 298.15 K and LiCl at 373.15 K. Moreover, the area of the crystallization region of lithium chloride and sodium chloride increase with the increasing temperature, while that of potassium chloride decrease dramatically. Meanwhile, on the base of Pitzer model and its extended HW model, the solubilities in this quaternary system at 288.15 K were calculated and it shows that the predicted solubility result agree well with the experimental data.
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Funding
The work was supported by the Key Research and Development Program of Hebei Province, National Natural Science Foundation of China (21406048 and U1507109), applied basic research plan of Hebei Province (13963103D), the Natural Science Foundation of Hebei Province (B2017202198), and the Natural Science Foundation of Tianjin (17JCYBJC19500, 15JCQNJC06100).
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Ji-jun Zhang, Ren, My., Li, Dc. et al. Solid–Liquid Phase Equilibrium in the Quaternary System (LiCl + NaCl + KCl + H2O) at 288.15 K. Russ. J. Phys. Chem. 94, 1565–1572 (2020). https://doi.org/10.1134/S0036024420080348
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DOI: https://doi.org/10.1134/S0036024420080348