Vapor鈥揕iquid Equilibria for the ZnSO4鈥揌2SO4鈥揌2O and MgSO4鈥揌2SO4鈥揌2O Systems at (30, 60, 90, and 101.3) kPa

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• 作者：Geng Li ; Yan Zhang ; Edouard Asselin ; Zhibao Li
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2014
• 出版时间：November 13, 2014
• 年：2014
• 卷：59
• 期：11
• 页码：3449-3460
• 全文大小：1255K
• ISSN：1520-5134

文摘

Vapor鈥搇iquid equilibria (boiling points) data for the ZnSO₄鈥揌₂SO₄鈥揌₂O and the MgSO₄鈥揌₂SO₄鈥揌₂O systems were determined by the quasi-static ebulliometric method at (30, 60, 90, and 101.3) kPa. The boiling points of the ZnSO₄鈥揌₂O and the ZnSO₄鈥揌₂SO₄鈥揌₂O systems were used to regress new chemical model parameters with the average absolute deviation of only 0.08 K. The model was verified by comparing its predictions of the solubility of zinc sulfate in water from (273.15 to 310.15) K and the activity of water in zinc sulfate solution at 298.15 K with literature data. Furthermore, the distributions of the ZnSO₄(aq) (ZnSO₄ neutral species), Zn²⁺, MgSO₄(aq) (MgSO₄ neutral species) and Mg²⁺ species were predicted. The ZnSO₄鈭扝₂SO₄鈭扝₂O system speciation provided a thermodynamic basis for the empirically optimized zinc sulfate concentrations currently employed in the Zn electrowinning industry.