TY - JOUR
T1 - Accelerated carbonation of steelmaking slags in a high-gravity rotating packed bed
AU - Chang, E. E.
AU - Pan, Shu Yuan
AU - Chen, Yi Hung
AU - Tan, Chung Sung
AU - Chiang, Pen Chi
N1 - Funding Information:
This study was support by National Science Council of Taiwan, R.O.C., under Grant No. NSC-101-3113-E-007-005. The China Steel Corporation and CHC Resources Corporation were highly appreciated by authors for providing the steelmaking slag in this investigation.
Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/8/15
Y1 - 2012/8/15
N2 - 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.
AB - 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.
KW - Alkaline solid wastes
KW - Basic oxygen furnace slag
KW - Calcium carbonate
KW - CO sequestration
KW - Shrinking core model
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U2 - 10.1016/j.jhazmat.2012.05.021
DO - 10.1016/j.jhazmat.2012.05.021
M3 - Article
C2 - 22633879
AN - SCOPUS:84862644936
VL - 227-228
SP - 97
EP - 106
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
SN - 0304-3894
ER -