Carbon dioxide (CO 2) sequestration using the accelerated carbonation of basic oxygen furnace (BOF) slag in a high-gravity rotating packed bed (RPB) under various operational conditions was investigated. The effects of reaction time, reaction temperature, rotation speed and slurry flow rate on the CO 2 sequestration process were evaluated. The samples of reacted slurry were analyzed quantitatively using thermogravimetric analysis (TGA) and atomic absorption spectrometry (AAS) and qualitatively using X-ray diffraction (XRD), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX), and transmission electron microscopy (TEM). The sequestration experiments were performed at a liquid-to-solid ratio of 20:1 with a flow rate of 2.5Lmin -1 of a pure CO 2 stream under atmospheric temperature and pressure. The results show that a maximum conversion of BOF slag was 93.5% at a reaction time of 30min and a rotation speed of 750rpm at 65°C. The experimental data were utilized to determine the rate-limiting mechanism based on the shrinking core model (SCM), which was validated by the observations of SEM and TEM. Accelerated carbonation in a RPB was confirmed to be a viable method due to its higher mass-transfer rate.
ASJC Scopus subject areas
- Health, Toxicology and Mutagenesis
- Waste Management and Disposal
- Environmental Chemistry
- Environmental Engineering
Chang, E. E., Pan, S. Y., Chen, Y. H., Tan, C. S., & Chiang, P. C. (2012). Accelerated carbonation of steelmaking slags in a high-gravity rotating packed bed. Journal of Hazardous Materials, 227-228, 97-106. https://doi.org/10.1016/j.jhazmat.2012.05.021