CO2 sequestration by carbonation of steelmaking slags in an autoclave reactor

E. E. Chang, Shu Yuan Pan, Yi Hung Chen, Hsiao Wen Chu, Chu Fang Wang, Pen Chi Chiang

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Carbon dioxide (CO2) sequestration experiments using the accelerated carbonation of three types of steelmaking slags, i.e., ultra-fine (UF) slag, fly-ash (FA) slag, and blended hydraulic slag cement (BHC), were performed in an autoclave reactor. The effects of reaction time, liquid-to-solid ratio (L/S), temperature, CO2 pressure, and initial pH on CO2 sequestration were evaluated. Two different CO2 pressures were chosen: the normal condition (700psig) and the supercritical condition (1300psig). The carbonation conversion was determined quantitatively by using thermo-gravimetric analysis (TGA). The major factors that affected the conversion were reaction time (5min to 12h) and temperature (40-160°C). The BHC was found to have the highest carbonation conversion of approximately 68%, corresponding to a capacity of 0.283kgCO2/kgBHC, in 12h at 700psig and 160°C. In addition, the carbonation products were confirmed to be mainly in CaCO3, which was determined by using scanning electron microscopy (SEM) and X-ray powder diffraction (XRD) to analyze samples before and after carbonation. Furthermore, reaction kinetics were expressed with a surface coverage model, and the carbon footprint of the developed technology in this investigation was calculated by a life cycle assessment (LCA).

Original languageEnglish
Pages (from-to)107-114
Number of pages8
JournalJournal of Hazardous Materials
Volume195
DOIs
Publication statusPublished - Nov 15 2011

Fingerprint

Carbonation
Steelmaking
Autoclaves
slag
carbon sequestration
Slags
Carbon Footprint
Coal Ash
Conversion Disorder
Powder Diffraction
Pressure
Temperature
Slag cement
Life Cycle Stages
Carbon Dioxide
X-Ray Diffraction
Electron Scanning Microscopy
Technology
cement
Hydraulics

Keywords

  • Accelerated carbonation
  • Alkaline solid waste
  • Calcite
  • Life cycle assessment
  • Surface coverage model

ASJC Scopus subject areas

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

Cite this

Chang, E. E., Pan, S. Y., Chen, Y. H., Chu, H. W., Wang, C. F., & Chiang, P. C. (2011). CO2 sequestration by carbonation of steelmaking slags in an autoclave reactor. Journal of Hazardous Materials, 195, 107-114. https://doi.org/10.1016/j.jhazmat.2011.08.006

CO2 sequestration by carbonation of steelmaking slags in an autoclave reactor. / Chang, E. E.; Pan, Shu Yuan; Chen, Yi Hung; Chu, Hsiao Wen; Wang, Chu Fang; Chiang, Pen Chi.

In: Journal of Hazardous Materials, Vol. 195, 15.11.2011, p. 107-114.

Research output: Contribution to journalArticle

Chang, E. E. ; Pan, Shu Yuan ; Chen, Yi Hung ; Chu, Hsiao Wen ; Wang, Chu Fang ; Chiang, Pen Chi. / CO2 sequestration by carbonation of steelmaking slags in an autoclave reactor. In: Journal of Hazardous Materials. 2011 ; Vol. 195. pp. 107-114.
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