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

82 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

Fingerprint

Hypergravity
Basic oxygen converters
Carbonation
Steelmaking
Packed beds
Carbon Monoxide
slag
Slags
Gravitation
Flow rate
gravity
Transmission electron microscopy
Transmission Electron Microscopy
Atmospheric temperature
Atomic absorption spectrometry
Scanning electron microscopy
carbon sequestration
X-Ray Emission Spectrometry
Oxygen
slurry

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

Cite this

Accelerated carbonation of steelmaking slags in a high-gravity rotating packed bed. / Chang, E. E.; Pan, Shu Yuan; Chen, Yi Hung; Tan, Chung Sung; Chiang, Pen Chi.

In: Journal of Hazardous Materials, Vol. 227-228, 15.08.2012, p. 97-106.

Research output: Contribution to journalArticle

Chang, E. E. ; Pan, Shu Yuan ; Chen, Yi Hung ; Tan, Chung Sung ; Chiang, Pen Chi. / Accelerated carbonation of steelmaking slags in a high-gravity rotating packed bed. In: Journal of Hazardous Materials. 2012 ; Vol. 227-228. pp. 97-106.
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