title: High-Gravity Carbonation Process for Enhancing CO2 Fixation and Utilization Exemplified by the Steelmaking Industry.
abstract: The high-gravity carbonation process for CO2 mineralization and product utilization as a green cement was evaluated using field operation data from the steelmaking industry. The effect of key operating factors, including rotation speed, liquid-to-solid ratio, gas flow rate, and slurry flow rate, on CO2 removal efficiency was studied. The results indicated that a maximal CO2 removal of 97.3% was achieved using basic oxygen furnace slag at a gas-to-slurry ratio of 40, with a capture capacity of 165 kg of CO2 per day. In addition, the product with different carbonation conversions (i.e., 0%, 17%, and 48%) was used as supplementary cementitious materials in blended cement at various substitution ratios (i.e., 0%, 10%, and 20%). The performance of the blended cement mortar, including physicochemical properties, morphology, mineralogy, compressive strength, and autoclave soundness, was evaluated. The results indicated that the mortar with a high carbonation conversion of slag exhibited a higher mechanical strength in the early stage than pure portland cement mortar, suggesting its suitability for use as a high early strength cement. It also possessed superior soundness compared to the mortar using fresh slag. Furthermore, the optimal operating conditions of the high-gravity carbonation were determined by response surface models for maximizing CO2 removal efficiency and minimizing energy consumption.
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University , 71 Chou-Shan Road, Da-an District, Taipei City, 10673 Taiwan (R.O.C.).
authors.forename: Shu-Yuan
authors.initials: SY
authors.lastname: Pan
authors.affiliation: Department of Chemical Engineering and Biotechnology, National Taipei University of Technology , No. 1, Section 3, Zhongxiao E Road, Taipei City, Taiwan 10608, Taiwan (R.O.C.).
authors.forename: Yi-Hung
authors.initials: YH
authors.lastname: Chen
authors.affiliation: China Steel Corporation, Kaohsiung, 1 Chung Kang Road, Hsiao Kang, Kaohsiung 81233, Taiwan (R.O.C.).
authors.forename: Chun-Da
authors.initials: CD
authors.lastname: Chen
authors.affiliation: China Steel Corporation, Kaohsiung, 1 Chung Kang Road, Hsiao Kang, Kaohsiung 81233, Taiwan (R.O.C.).
authors.forename: Ai-Lin
authors.initials: AL
authors.lastname: Shen
authors.affiliation: Carbon Cycle Research Center, National Taiwan University , 71 Fan-Lan Road, Da-an District, Taipei City, 10672 Taiwan (R.O.C.).
authors.forename: Michael
authors.initials: M
authors.lastname: Lin
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University , 71 Chou-Shan Road, Da-an District, Taipei City, 10673 Taiwan (R.O.C.).|Carbon Cycle Research Center, National Taiwan University , 71 Fan-Lan Road, Da-an District, Taipei City, 10672 Taiwan (R.O.C.).
authors.forename: Pen-Chi
authors.initials: PC
authors.lastname: Chiang
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D002254:Carbonates / Q000737:chemistry; D019245:Compressive Strength; D006112:Gravitation; D007220:Industrial Waste; D008669:Metallurgy / Q000379:methods*; D008855:Microscopy, Electron, Scanning; D013232:Steel; D014961:X-Ray Diffraction
chemical_list: D002254:Carbonates; D007220:Industrial Waste; D013232:Steel; D002245:Carbon Dioxide