Crystallization of calcium sulfate dihydrate in the presence of some metal ions

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• 作者：Samia K. Hamdona ; Umaima A. Al Hadad
• 关键词：A1. Crystallization ; A2. Growth from solutions ; B1. Additives ; B1. Calcium sulfate ; B1. Inhibitors ; B1. Metal ions
• 刊名：Journal of Crystal Growth
• 出版年：2007
• 期刊代码：49_00220248
• 类别：ch
• 出版时间：1 February 2007
• 卷：299
• 期：1
• 页码：146-151
• 文件大小：427 K

摘要

Crystallization of calcium sulfate dihydrate (CaSOb>4b>·2Hb>2b>O gypsum) in sodium chloride solutions in the presence of some metal ions, and over a range of relative super-saturation has been studied. The addition of metal ions, even at relatively low concentration (10⁻⁶ mol l⁻¹), markedly retard the rate of crystallization of gypsum. Retardation effect was enhanced with increase in the additives contents. Moreover, the effect was enhanced as the relative super-saturation decreases. Influence of mixed additives on the rate of crystallization (Cd²⁺+Arg, Cd²⁺+Hb>3b>POb>4b> and Cd²⁺+PAA) has also been studied. Direct adsorption experiments of these metal ions on the surface of gypsum crystals have been made for comparison.