Phase Equilibria in the Ternary Systems Li2B4O7–MgB4O7–H2O and K2B4O7–MgB4O7–H2O at 273 K

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• 作者：Chao Fu ; Shi-hua Sang ; Mei-fang Zhou ; Qing-zhu Liu ; Ting-ting Zhang
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2016
• 出版时间：March 10, 2016
• 年：2016
• 卷：61
• 期：3
• 页码：1071-1077
• 全文大小：393K
• ISSN：1520-5134

文摘

Phase equilibria and phase diagram always play an important role to utilize the salt lake brine resources. In this paper, the phase equilibria in two ternary systems Li₂B₄O₇–MgB₄O₇–H₂O and K₂B₄O₇–MgB₄O₇–H₂O at 273 K were studied using the isothermal solubility equilibrium method. The densities and solubilities of the components in these systems listed above were measured. Based on the determined equilibrium data and the corresponding equilibrium solid phase, the phase diagram of the ternary systems were shown, respectively. The results show that the two ternary systems at 273 K are simple total saturated type and there are no complex salt and solid solution found. Besides, the phase diagrams of the two ternary systems are both constituted of a eutectic point, two univariant solubility curves, and two solid crystalline phase regions. The two equilibrium solid phases corresponding to the eutectic point of the Li₂B₄O₇–MgB₄O₇–H₂O ternary system are Li₂B₄O₇·3H₂O and MgB₄O₇·9H₂O. In the K₂B₄O₇–MgB₄O₇–H₂O ternary system, K₂B₄O₇·4H₂O and MgB₄O₇·9H₂O are the two equilibrium solid phases relevant to the eutectic point. Furthermore, the experimental results of densities were simply discussed, and the phase diagrams at different temperatures were compared.