Study on preparation and crystalline transformation of nano- and micro-CaCO3 by supercritical carbon dioxide

Calcium carbonate (CaCO3) microparticles with controlled size and morphology were prepared by carbonization method in a closed reactor under high pressure and supercritical conditions. The saturated calcium hydroxide solution (Ca(OH)2) and CO2 were used as the reactants, and ethanolamine was used as the chemical additive. The optimal reaction conditions including the concentration of ethanolamine, temperature, time and pressure were...