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.

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