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

Crystallization of calcium sulfate dihydrate (CaSO 4·2H 2O 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 r...

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Bibliographic Details
Published in:Journal of crystal growth 2007-02, Vol.299 (1), p.146-151
Main Authors: Hamdona, Samia K., Al Hadad, Umaima A.
Format: Article
Language:English
Subjects:
A1. Crystallization
A2. Growth from solutions
B1. Additives
B1. Calcium sulfate
B1. Inhibitors
B1. Metal ions
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Growth from solutions
Materials science
Methods of crystal growth
physics of crystal growth
Physics
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Summary:Crystallization of calcium sulfate dihydrate (CaSO 4·2H 2O 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 (Cd 2++Arg, Cd 2++H 3PO 4 and Cd 2++PAA) has also been studied. Direct adsorption experiments of these metal ions on the surface of gypsum crystals have been made for comparison.
ISSN:0022-0248
1873-5002
DOI:10.1016/j.jcrysgro.2006.11.139