Experimental Determination and Modeling of the Solubility of CaSO4路2H2O and CaSO4 in the Quaternary System CaSO4 + MgSO4 + H2SO4<

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• 作者：Wenlei Wang ; Dewen Zeng ; Juntao Wang ; Hongliang Li ; Lichao Wu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：August 13, 2014
• 年：2014
• 卷：53
• 期：32
• 页码：12839-12847
• 全文大小：643K
• ISSN：1520-5045

文摘

A theoretical and experimental investigation of solubility of gypsum and anhydrite II in the complex system CaSO₄ + MgSO₄ + H₂SO₄ + H₂O was conducted from 298.1 to 363.1 K. The solubility of anhydrite II in (MgSO₄ + H₂SO₄) aqueous solutions was determined at 348.1 and 363.1 K by an isothermal method. A Pitzer thermodynamic model was selected to predict the solubility of gypsum and anhydrite II in the titled quaternary system. Good agreement between the experimental and the model values was observed, which supports the reliability of the model prediction. As predicted by the model, the transfer temperature from gypsum to anhydrite II decreases with increasing H₂SO₄ and MgSO₄ concentrations, and the solubilities of gypsum and anhydrite II decrease monotonically with increasing MgSO₄ concentration if H₂SO₄ concentration is higher than 0.5 mol路kg^鈥?. On the basis of the results obtained, several suggestions for avoiding calcium sulfate scaling in the industrial process were proposed.