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

研究成果: 雜誌貢獻文章同行評審

147 引文 斯高帕斯(Scopus)


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).
頁(從 - 到)107-114
期刊Journal of Hazardous Materials
出版狀態已發佈 - 11月 15 2011

ASJC Scopus subject areas

  • 健康、毒理學和誘變
  • 污染
  • 廢物管理和處置
  • 環境化學
  • 環境工程


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