CaCO3 Nanopowder Production by Co-Precipitation of Aerosols of Precursor Solutions of Na2CO3 and CaCl2

Abstract

Submicron-sized calcium carbonate (CaCO3) particles were prepared using an aerosol method in which two commercial air humidifiers containing 0.05 M of Na2CO3 and CaCl2 aqueous solutions were utilized as aerosol suppliers. Two streams of aerosols evaporated from the separate humidifiers were allowed to meet in 17-meter long, spiral reaction tube where collisions between two types of droplets containing precursor reagents leaded to grow of CaCO3 particles and precipitate onto the inner walls. XRD and SEM analysis revealed that CaCO3 particles were formed in calcite phase almost entirely.