CO2 sequestration by carbonation of steelmaking slags in an autoclave reactor

被引:153
作者
Chang, E. -E. [2 ]
Pan, Shu-Yuan [1 ]
Chen, Yi-Hung [3 ]
Chu, Hsiao-Wen [1 ]
Wang, Chu-Fang [4 ]
Chiang, Pen-Chi [1 ]
机构
[1] Natl Taiwan Univ, Grad Inst Environm Engn, Taipei, Taiwan
[2] Taipei Med Univ, Dept Biochem, Taipei, Taiwan
[3] Natl Taipei Univ Technol, Dept Chem Engn & Biotechnol, Taipei, Taiwan
[4] Natl Tsing Hua Univ, Hsinchu, Taiwan
关键词
Accelerated carbonation; Alkaline solid waste; Calcite; Surface coverage model; Life cycle assessment; ASH;
D O I
10.1016/j.jhazmat.2011.08.006
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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 (700 psig) and the supercritical condition (1300 psig). The carbonation conversion was determined quantitatively by using thermo-gravimetric analysis (TGA). The major factors that affected the conversion were reaction time (5 min to 12 h) and temperature (40-160 degrees C). The BHC was found to have the highest carbonation conversion of approximately 68%, corresponding to a capacity of 0.283 kg CO2/kg BHC, in 12 h at 700 psig and 160 degrees 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). (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:107 / 114
页数:8
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