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Integrated CO2 Fixation, Waste Stabilization and Product Utilization via High-gravity Carbonation Process Exemplified by CFB Fly Ash Shu-Yuan Pan, Chen-Hsiang Hung, Yin-Wen Chan, Hyunook Kim, Ping Li, and Pen-Chi Chiang ACS Sustainable Chem. Eng., Just Accepted Manuscript • DOI: 10.1021/ acssuschemeng.6b00014 • Publication Date (Web): 18 Apr 2016 Downloaded from http://pubs.acs.org on April 24, 2016
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ACS Sustainable Chemistry & Engineering
Integrated CO2 Fixation, Waste Stabilization and Product Utilization via High-gravity Carbonation Process Exemplified by CFB Fly Ash Shu-Yuan Pan,‡ Chen-Hsiang Hung,‡ Yin-Wen Chan,∥ Hyunook Kim,§ Ping Li,† and Pen-Chi Chiang*,‡,† ‡
Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Road, Da-an District, Taipei City 10673, Taiwan
∥ Department
of Civil Engineering, National Taiwan University, 1, Sec. 4, Roosevelt Road, Da-an District, Taipei City 10617, Taiwan
§
Department of Environmental Engineering, University of Seoul, 163 Siripdaero, Dongdaemun-gu, Seoul 130-743, Korea
†
School of Environment and Energy, South China University of Technology, 382 Zhonghuan Road East, Panyu District, Guangzhou, Guangdong 510006, China.
Author Information Corresponding Author * Phone: +886-2-23622510; fax: +886-2-23661642; e-mail:
[email protected].
Notes The authors declare no competing financial interest.
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Abstract The valorization of industrial solid wastes in civil engineering is one of the main routes for enhancing resource cycle towards environmental and social sustainability. In this study, an integrated approach to capturing CO2 in flue gas and stabilizing solid wastes for utilization as supplementary cementitious material via a high-gravity carbonation (HiGCarb) process was proposed. The fly ash (FA) generated from a circular fluidized bed boiler in a petrochemical industry was used. The effect of different operating parameters on carbonation conversion was evaluated by the response surface methodology. The maximal carbonation conversion of FA was 77.2% at a rotation speed of 743 rpm and an L/S ratio of 18.9 at 57.3 oC. In addition, the workability, strength development, and durability of the blended cement with different substitution ratios (i.e., 10%, 15%, and 20%) of carbonated FA were evaluated. The results indicated that cement with carbonated FA exhibited superior properties, e.g., initial compressive strength (3,400 psi at 7 d in 10% substitution ratio) and durability (autoclave expansion
