Abstract
Solid-liquid phase equilibria of the quaternary system (NaCl + NaBO2 + KCl + KBO2 + H2O) is very important for the separation of potassium and boron salts from the salt lake brines. In this paper, the solubilities, densities and refractive indices of the quaternary system (NaCl + NaBO2 + KCl + KBO2 + H2O) at 288.15 K were determined by the isothermal solution equilibrium method. The experimental results show that the (NaCl + NaBO2 + KCl + KBO2 + H2O) system contains three invariant points, seven univariate solubility curves, and five salt crystallization regions corresponding to halite (NaCl), sodium metaborate tetrahydrate (NaBO2·4H2O), hydrated potassium metaborate (KBO2·4/3H2O), sylvite (KCl), and the double salt teepleite (NaCl·NaBO2·2H2O, Te) existed in this system. KCl occupies the greatest part of phase region, while KBO2·4/3H2O covers the smallest. These results show that KCl could be easily crystallized and separated from this system. The physicochemical properties (refractive index and density) presents a regular variation with the increasing of Jänecke index values of \(J({\text{BO}}_{2}^{ - })\) in the solution.
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The work was supported by the Program of the National Natural Science Foundation of China (22078247, U1707602, and U1507109), the Natural Science Foundation of Hebei Province (B2021202058), and the Yangtze Scholars and Innovative Research Team in University of Ministry of Education of China (IRT-17R81).
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Jia-ying He, Wang, Dy., Wang, Mm. et al. Solubilities, Densities, and Refractive Indices of the Quaternary System (NaCl + NaBO2 + KCl + KBO2 + H2O) at 288.15 K. Russ. J. Inorg. Chem. 67, 2239–2246 (2022). https://doi.org/10.1134/S0036023622700127
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DOI: https://doi.org/10.1134/S0036023622700127