Controlled precipitation of CaCO3 sub-micro crystals of well-defined structure in a multiphase system

Karolina Kędra-Królik 1Paweł Gierycz 1Janusz J. Bucki 2

1. Polish Academy of Sciences, Institute of Physical Chemistry, Kasprzaka 52/56, Warszawa 01-224, Poland
2. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland

Abstract

In this paper we present the new method that allows obtaining of super fine calcium carbonate particles in a (CO2 - Ca(OH)2 - H2O) system. A new rotating disc reactor was employed as a processing unit to run this multiphase process. The device enables to control inter- and intraface mass and energy transfer as well as the macro- and micromixing effects in the reacting system.

The system can be controlled by the rate of discs revolutions speed and mixing conditions in the system, reagents contact area or gas flow rate. The influence of different parameters on the reaction kinetics and precipitated powders properties were investigated.

The average particles diameter (hydrodynamic diameter) and the particles size distribution were determined with the Dynamic Light Scattering method. Crystals and agglomerates morphology was examined with the Scanning Electron Microscopy (SEM). SEM studies allowed also for particle and agglomerate size distribution measurements.

The testing with X-ray diffraction analysis confirmed that we have obtained a pure calcite, which is the most thermodynamically stable polymorph of CaCO3.

Our investigations results of produced powders properties confirm effectiveness of the applied technique for the controlled precipitation of superfine calcite crystals with well-defined and controlled size, shape and structure.

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Presentation: Poster at E-MRS Fall Meeting 2006, Symposium I, by Janusz J. Bucki
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-15 19:26
Revised:   2009-06-07 00:44
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