The Enhancement of CO2 Sequestration of Limestone in Cement Industry By Carbon Black Modification

The CO₂ sequestration is becoming more and more important due the global warming.  The investigation of CO₂ sequestration in cement industry is becoming even more important in China. Limestone, as the raw material in cement industry, was used to sequestrate the CO₂ had been reported.  However, the efficiency was dramatically reduced due the surface “sintering” during the recycling. Here we report a promising method to increase the CO₂ sequestration ability of limestone by simply adding some carbon black. The efficiency was increased over 17% compare to the pure limestone. The mechanism of the improvement was discussed and analylized by SEM, XRD and optical microscope.