Isopiestic Measurements on Aqueous Solutions of Heavy Metal Sulfates: MSO4 + H2O (M = Mn, Co, Ni, Cu, Zn). 1. T = 323.15 K

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• 作者：Haitang Yang ; Dewen Zeng ; Wolfgang Voigt ; Glenn Hefter ; Shijun Liu ; Qiyuan Chen
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2014
• 出版时间：January 9, 2014
• 年：2014
• 卷：59
• 期：1
• 页码：97-102
• 全文大小：271K
• ISSN：1520-5134

文摘

The water activities of the systems MSO₄ + H₂O (M = Mn, Co, Ni, Cu, Zn) at higher temperatures are important for heavy metal hydrometallurgy processing of these metals. This paper reports water activity data for these binary systems at 323.15 K from isopiestic measurements. The reliability of the apparatus was verified by determination of the water activities of the test systems at 298.15 K and also two reference systems CaCl₂ + H₂O and H₂SO₄ + H₂O at 298.15 K and 323.15 K. The results obtained agree well with literature data, with maximum relative deviations of the water activities for the reference systems of less than 0.032 % at 298.15 K and 0.062 % at 323.15 K respectively. The water activities for the MSO₄ + H₂O (M = Co, Ni, Cu, Zn) systems at 323.15 K were found to be approximately the same up to high concentrations, but were significantly lower than the MnSO₄ + H₂O system. The relative deviation of isopiestic molality of parallel samples in each experimental run is better than 0.2 %. The measured water activities reported in this work can be used to parametrize thermodynamic models of heavy-metal hydrometallurgical processes.