CO2 Capture Using Basic Oxygen-Furnace Slag with Cold-Rolling Wastewater in a Rotating Packed Bed
Date Issued
2012
Date
2012
Author(s)
Chen, Tse-Lun
Abstract
Basic oxygen furnace (BOF) slag, a residue from basic oxygen converter in the steelmaking process, is a potential material for CO2 capture due to it abundance in calcium species. Moreover, the cold-rolling wastewater (CRW), a residue from the same process, is highly alkaline and suitable for CO 2 capture. Co-utilization of alkaline waste is a novel approach for CO2 capture. The objectives of this study were to determine the degree of leaching and carbonation kinetics of BOF slag in different liquid agents. The mass balance of CO2 among gas, liquid, and solid phases was established as well. Two types of liquids, e.g., alkaline CRW and DIW, were selected to evaluate the degree of various metal ions leached from the BOF slag at different particle sizes with mechanical stirring up to 90 minutes. After that, the accelerated carbonation reaction was carried out with pure CO2 stream for 20 minutes in a rotating packed bed (RPB). The solid products were qualitatively analyzed with scanning electron microscopy and X-ray diffraction (XRD) and quantitatively with thermo-gravavimetric analysis (TGA). In addition, the leachate was analyzed with inductively coupled plasma-optical emission spectroscopy (ICP-OES). The results revealed that Ca2+ had the highest concentration than other ions in BOF slag. A model based on mass balance results and reaction constant k c was established to describe the carbonation kinetics. Consequently, carbonation of BOF slag in CRW was a promising method to enhance the CO2 capture capacity and reduce the environmental impact of alkaline wastes.
Subjects
alkaline wastes
accelerated carbonation
CO2 sequestration
calcium carbonate
mass balance
kinetics model development
SDGs
Type
thesis
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