https://scholars.lib.ntu.edu.tw/handle/123456789/78673
標題: | CO2 sequestration by carbonation of steelmaking slags in an autoclave reactor | 作者: | Chang, E.-E. Pan, Shu-Yuan Chen, Yi-Hung Chu, Hsiao-Wen Wang, Chu-Fang PEN-CHI CHIANG |
公開日期: | 2011 | 起(迄)頁: | 107-114 | 來源出版物: | Journal of Hazardous Materials | 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 (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). © 2011 Elsevier B.V. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/242665 | DOI: | 10.1016/j.jhazmat.2011.08.006 | SDG/關鍵字: | Accelerated carbonation; Alkaline solid waste; Autoclave reactors; Carbon footprint; Initial pH; Life cycle assessment; Life-cycle assessments; Major factors; Normal condition; Steelmaking slag; Supercritical condition; Surface coverage model; Surface coverages; XRD; Alkalinity; Autoclaves; Carbonate minerals; Carbonation; Gravimetric analysis; Life cycle; pH effects; Pressure vessels; Rating; Reaction kinetics; Scanning electron microscopy; Slag cement; Slags; Solid wastes; Steelmaking; X ray powder diffraction; Carbon dioxide; carbon dioxide; carbon; carbon dioxide; steel; carbon dioxide; carbon sequestration; cement; experimental study; fly ash; life cycle analysis; numerical model; reaction kinetics; scanning electron microscopy; slag; steel; thermogravimetry; transformation; X-ray diffraction; article; autoclave; blended hydraulic slag cement; carbon dioxide tension; carbon footprint; carbonation; chemical reaction; chemical reaction kinetics; fly ash; iron and steel industry; life cycle assessment; pH; pressure; reaction analysis; reaction time; reactor; slag; ultra fine slag; waste minimization; building material; chemistry; heat; kinetics; scanning electron microscopy; Carbon; Carbon Dioxide; Construction Materials; Hot Temperature; Kinetics; Microscopy, Electron, Scanning; Steel |
顯示於: | 環境工程學研究所 |
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