Phase Equilibria in the Ternary System (LiCl + Li2SO4 + H2O) at T = (288.15 and 308.15) K: Experimental Determination and Model Simulation

作者：Wang, Shiqiang^*; Han, Xunian; Jing, Yan; Guo, Yafei; Zhao, Meiling; Deng, Tianlong

来源：Journal of Chemical and Engineering Data, 2016, 61(3): 1155-1161.

DOI：10.1021/acs.jced.5b00805

• NATURAL-WATERS
• MINERAL SOLUBILITIES
• COPPER(II) SULFATES
• LIQUID-PHASE
• PREDICTION
• LITHIUM
• MAGNESIUM
• MODEL

The solubilities and physicochemical properties, including density, refractive index, and pH, of the ternary system (LiCl + Li2SO4 + H2O) at T = (288.15 and 308.15) K and p = 0.1 MPa were determined with the isothermal dissolution equilibrium method. The phase diagram in the ternary system at 288.15 K consists of one invariant point, two univariant solubility curves, and two crystallization regions corresponding to Li2SO4 center dot H2O and LiCl center dot H2O. A similar structure can be found in this system at 308.15 K. This ternary system belongs to hydrate type I at two temperatures, and neither double salts, nor solid solutions were formed at the investigated temperatures. The crystallized area of LiCl center dot H2O decreases with increasing temperature, while that of Li2SO4 center dot H2O increases obviously. The solution density, refractive index, and pH value of the ternary system (LiCl + Li2SO4 + H2O) at the two temperatures change regularly with the mass fraction of lithium. The Pitzer-Harvie-Weare thermodynamic model of aqueous electrolyte solutions was chosen to simulate the solubility of (LiCl + Li2SO4 + H2O) at (288.15 and 308.15) K. Reasonable agreement between the predicted solubilities and experimental data was found.

• 出版日期2016-3
• 单位天津科技大学