Abstract
Volume properties of salt lake solution are of great significance in constructing the thermodynamic model of the salt lake brine system and promote the comprehensive utilization of salt lake resources. In this paper, LiBO2(aq) densities from 0.08083 to 0.75731 mol·kg−1 were determined experimentally at 5 K temperature intervals from 283.15 to 363.15 K and 101 kPa using a precise digital vibrating-tube densimeter. The apparent molar volume (Vϕ) and the thermal expansion coefficient (α) were derived based on the experimental data. The 3D diagrams of the apparent molar volume and the thermal expansion coefficient against molality and temperature were demonstrated. According to the Pitzer thermodynamic model of apparent molar volume of electrolyte, the Pitzer single-salt parameters βMX(0)ν, βMX(1)ν, βMX(2)ν,CMXν of LiB(OH)4 and their temperature-dependence coefficients (p = Co + C1lnT/298.15 + C2(T-298.15) + C3/(620-T) + C4/(T-227) were established for the first time. A comparison between the predictive and experimental data indicates that the experimental data and the parameters obtained in this work are reliable.
Published Version
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