期刊
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
卷 49, 期 12, 页码 5569-5574出版社
AMER CHEMICAL SOC
DOI: 10.1021/ie902022b
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资金
- MOST of the People's Republic of China [2006AA06Z385]
- Science and Technology Department of Zhejiang Province, China [2007C23055]
The precipitation kinetics of the metastable calcium sulfate hemihydrate (HH) from aqueous solutions has seldom been addressed. For the first time, the nucleation kinetics of calcium sulfate (probably in alpha-HH form) in concentrated CaCl2 solutions at 90 degrees C and the effect of Mg2+ ions were investigated by spontaneous precipitation experiments and a turbidity monitoring method. The results indicate that, at a moderate supersaturation with respect to calcium sulfate, Mg2+ ions retard the nucleation with 0.01 M Mg2+ ions showing the strongest effect; at a higher supersaturation, the inhibition effect decreases when the concentration of Mg2+ ions increases from 0.001 to 0.10 M, and 0.20 M Mg2+ ions show a promoting effect on the precipitation. The interfacial tension values increase with the concentration of Mg2+ ions, resulting in a decrease in nucleation rate in Mg2+ ion-containing solutions compared to Mg2+ ion-free solutions. This may indicate an involvement of Mg2+ ions in the surface reaction during calcium sulfate precipitation.
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