Abstract
Solid–liquid phase equilibria of the quaternary system (Li+,K+//\({\text{SO}}_{4}^{{2 - }}\),\({\text{CO}}_{3}^{{2 - }}\)–H2O) and its subsystem are very important for the separation of lithium and potassium salts from the salt lake brines. In this paper, the solubilities, densities, refractive indices and pH values of the reciprocal quaternary system (Li+,K+//\({\text{SO}}_{4}^{{2 - }}\),\({\text{CO}}_{3}^{{2 - }}\)–H2O) at 308.15 K were determined experimentally using the isothermal dissolution method. The dry-salt diagram and water-phase diagram were plotted based on the experimental data. The stable phase diagram contains four invariant points, nine univariant curves and six crystallization regions corresponding to Li2CO3, Li2CO3⋅K2CO3, K2CO3⋅1.5H2O, Li2SO4⋅H2O, K2SO4, and Li2SO4⋅K2SO4. Li2CO3 has the largest crystallization field, whereas the Li2CO3⋅K2CO3 crystallization field is the smallest one.
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Financial support from National Natural Science Foundation of China (22078247), and the 2023 Kunlun Talents Program: High-End Innovative and Entrepreneurial Talents of Qinghai Province are greatly acknowledged.
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Cheng, H., Zhang, S., Han, S. et al. Solid–Liquid Stable Phase Equilibria of the Quaternary System (Li+,K+//\({\text{SO}}_{4}^{{2 - }}\),\({\text{CO}}_{3}^{{2 - }}\)–H2O) at 308.15 K. Russ. J. Phys. Chem. (2024). https://doi.org/10.1134/S0036024424020079
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DOI: https://doi.org/10.1134/S0036024424020079