期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 260, 期 -, 页码 937-946出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2013.06.052
关键词
Accelerated carbonation; Material balance; Mass balance; Reaction rate constant; Mass transfer coefficient
资金
- National Science Council (NSC) of Taiwan, Republic of China [NSC 102-3113-P-007-007]
In this study, direct and indirect carbonation of basic oxygen furnace slag (BOFS) coupled with cold-rolling wastewater (CRW) was carried out via a rotating packed bed (RPB). The solid products were qualitatively characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) and quantitatively analyzed with thermogravimetric analysis (TGA). The leachate was analyzed with inductively coupled plasma-optical emission spectroscopy (ICP-OES). The results indicate that the maximum achievable carbonation conversion (MACC) of BOFS was 90.7%, corresponding to a capture capacity of 0.277 g CO2/g of BOFS, by direct carbonation with CRW under a rotation speed of 750 rpm at 30 degrees C for 20 min. In addition, CO2 mass balance among the gas, liquid, and solid phases within an RPB was well-developed, with an error less than 10%, to confirm the actual CO2 capture capacity of BOFS with precision and accuracy. Furthermore, a reaction kinetic model based on mass balance was established to determine the reaction rate constant for various liquid agents (CRW and pure water). It was concluded that co-utilization of alkaline wastes including BOFS and CRW via the RPB is a novel approach for both enhancing CO2 capture capacity and reducing the environmental impacts of alkaline wastes. (C) 2013 Elsevier B.V. All rights reserved.
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