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Formation and aggregation of polymorphs in continuous precipitation .2. Kinetics of CaCO3 precipitation

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Title Formation and aggregation of polymorphs in continuous precipitation .2. Kinetics of CaCO3 precipitation
 
Creator CHAKRABORTY, D
BHATIA, SK
 
Subject calcium-carbonate crystallization
monolayers
ions
 
Description Experiments with the continuous precipitation of calcium carbonate are reported in this study. Particle size distributions were measured on-line and interpreted by means of the simultaneous nucleation and the transformation models developed in part 1 of this sequence. Three regimes of precipitation are reported in this study, governed by the supersaturation and liquid phase [Ca2+]/[CO32-] ionic ratio. These comprise of a heterogeneous regime involving calcite and vaterite nucleation at moderate [Ca2+]/[CO32-] ionic ratio in an unsealed reactor, homogeneous nucleation of vaterite followed by transformation to calcite in a scaled reactor at low and moderate [Ca2+]/[CO32-] ratio, and formation of stable vaterite at high [Ca2+]/[CO32-] ratio. The particle size distributions in the different regimes are well fitted by the applicable model from part 1 or earlier studies of single-species precipitation. Where appropriate, kinetic parameters obtained from the fits are correlated with supersaturation by power law models.
 
Publisher AMER CHEMICAL SOC
 
Date 2011-07-14T05:21:15Z
2011-12-26T12:48:12Z
2011-12-27T05:46:25Z
2011-07-14T05:21:15Z
2011-12-26T12:48:12Z
2011-12-27T05:46:25Z
1996
 
Type Article
 
Identifier INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 35(6), 1995-2006
0888-5885
http://dx.doi.org/10.1021/ie950402t
http://dspace.library.iitb.ac.in/xmlui/handle/10054/3866
http://hdl.handle.net/10054/3866
 
Language en