Kinetic modeling on CO2 capture using basic oxygen furnace slag coupled with cold-rolling wastewater in a rotating packed bed

E. E. Chang, Tse Lun Chen, Shu Yuan Pan, Yi Hung Chen, Pen Chi Chiang

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

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 0.277g CO2/g of BOFS, by direct carbonation with CRW under a rotation speed of 750rpm at 30°C for 20min. 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.

Original languageEnglish
Pages (from-to)937-946
Number of pages10
JournalJournal of Hazardous Materials
Volume260
DOIs
Publication statusPublished - Sep 15 2013

Keywords

  • Accelerated carbonation
  • Mass balance
  • Mass transfer coefficient
  • Material balance
  • Reaction rate constant

ASJC Scopus subject areas

  • Health, Toxicology and Mutagenesis
  • Pollution
  • Waste Management and Disposal
  • Environmental Chemistry
  • Environmental Engineering

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