Products of carbonation of cement kiln dust

Cement kiln dust (CKD), a by-product of cement clinker manufacturing, embodies considerable amounts of alkali and alkaline-earth compounds, presenting a potential route for CO2 sequestration. The study aims to clarify the potential of CKD for CO2 capture and storage. Two experimental schemes were used: (1) direct carbonation of dry CKD and (2) carbonation of hydrated CKD. Analytical techniques such as XRF, XRD, FT-IR, SEM and DSC/TG were employed to characterize the mineralogical and morphological transformations of hydratation and carbonation of CKD. The findings reveal that even in the dry state, the CKD has the ability to react with carbon dioxide at normal pressure to form stable mineral phases such as calcite and vaterite. The study confirms that CKD, both in raw and hydrated forms, holds promise for CO2 capture and storage applications.