Effects of edta and ethanol on the morphology of CaCO3 particle

Micron calcium carbonate (CaCO₃) particles with different morphologies were prepared using calcium chloride and sodium carbonate (Na₂CO₃) aqueous solutions containing various amounts of ethylenediamine tetraacetic acid (EDTA) or ethanol. The products were characterised by X-ray diffraction and scanning electron microscopy. A spindle CaCO₃ particle was synthesised in 25% ethanol solution at room temperature. In the presence of 5%g EDTA, CaCO₃ hemispheres could be vastly obtained in a highly morphological yield. A twin-sphere CaCO₃ particle was obtained when 5 g EDTA and 25 ethanol solution was used in all. The growing mechanism of CaCO₃ particles was discussed.