Preparation of Plate-like Calcium Carbonate

A fast carbonation process was developed to synthesis plate-like calcium carbonate in dilute lime slurry. The influence of some process factors, such as the solid concentration of lime slurry, the orifice diameter of gas distributor, the flow rate of CO2, and the reaction temperature on the morphology of CaCO3 was investigated. The experimental results and the thermodynamic calculation indicate that lower pH, stronger absorbing of CO2, and lower Ca2+/CT values are favorable for the formation of plate-like CaCO3. The suitable carbonation conditions are as follows: 0.1%(m) of the solid concentration of lime slurry, 0.7-1.5mm of the orifice diameter of the gas distributor, 100-400mL/min of CO2 flow rate, and temperature 20-30℃.