Determination of carbonation rate of precipitated calcium carbonate in carbonation process based on headspace gas chromatography.

This paper reports a method for determining the carbonation rate (CR) of precipitated calcium carbonate (PCC) during carbonation process based on headspace gas chromatography technique. The method was carried out by simultaneously detecting the signal values of carbon dioxide and oxygen. Then the carbonation rate of precipitated calcium carbonate in the carbonation process can be calculated by the ratio (γ) of carbon dioxide to oxygen based on a new mathematical model. The results showed that the employed method has good precision (the relative standard deviation < 5 %) and accuracy under the optimized equilibrium temperature and time (60 °C and 10 min). The method is simple and has a large measurable range, which can be an reliable tool for determining the carbonation rate in the carbonation process of PCC.