Accelerated carbonation of steelmaking slags in a high-gravity rotating packed bed

E. E. Chang, Shu Yuan Pan, Yi Hung Chen, Chung Sung Tan, Pen Chi Chiang

Research output: Contribution to journalArticle

97 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)97-106
Number of pages10
JournalJournal of Hazardous Materials
Volume227-228
DOIs
Publication statusPublished - Aug 15 2012

Keywords

  • Alkaline solid wastes
  • Basic oxygen furnace slag
  • Calcium carbonate
  • CO sequestration
  • Shrinking core model

ASJC Scopus subject areas

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

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