Phase equilibrium for the aqueous system containing lithium, sodium, potassium, chloride, and borate ions at 298.15 K
Phase equilibrium for the aqueous system containing lithium, sodium, potassium, chloride, and borate ions at 298.15 K
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DOI：
10.1021/je049975f
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发表时间：
2004-09-01
期刊：
影响因子：
--
通讯作者：
Deng, TL
中科院分区：
文献类型：
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作者：
Deng, TL
研究了含锂、钠、钾、氯和硼酸根离子的水溶液体系的溶解度以及该体系在298.15 K时的密度、粘度、折射率、电导率和pH值。根据Janeche指数值绘制了该体系的干盐、钠和水的相图。该体系的干盐相图包括两个四盐共饱和点、五条溶解度等温线和四个结晶区，均用氯化钠饱和，对应于氯化钾、氯化锂一水合物、氯化钠和硼酸锂三水合物。在Pitzer混合电解质水溶液半经验方程的基础上，采用Harvie化学平衡模型拟合了硼酸锂单盐Pitzer参数β（（0））、β（（1））和C-phi以及三重态混合参数Psi（Li，Cl，B45（OH）4）、Psi（Li，K，B4O5（OH）4）和Psi（Li，Na，B4O5（OH）4）等。然后演示了五组分体系中盐的溶解度的预测。计算的溶解度与实验值吻合较好。
The solubility of the aqueous system containing lithium, sodium, potassium, chloride, and borate ions and the densities, viscosities, refractive indexes, conductivities, and pH at 298.15 K of the system have been studied. On the basis of the Janeche index values, the phase diagrams of dry salt, sodium, and water of the system were plotted. The dry-salt phase diagram of the system includes two four-salt cosaturation points, five solubility isotherm curves, and four crystallization zones all saturated with sodium chloride corresponding to potassium chloride, lithium chloride monohydrate, borax, and lithium borate trihydrate. No solid solution and double salts were found. On the basis of Pitzer's semiempirical equation for a mixed aqueous electrolytic solution, the chemical equilibrium model of Harvie was used to fit the single-salt Pitzer parameters of lithium borate, beta((0)), beta((1)), and C-phi and the triplet mixed parameters Psi(Li,Cl,B45(OH)4), Psi(Li,K,B4O5(OH)4), and Psi(Li,Na,B4O5(OH)4) in this system, which are not reported in the literature. The prediction of the solubilities of salts in the five-component system was then demonstrated. The calculated solubilities agree well with the experimental values.