We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Enhanced Carbonation of Free CaO in Basic Oxygen Furnace Slag Under High Temperature and Moderate Pressure and Its Kinetics.
- Authors
Wang, Zhenghao; Zheng, Songming; Duan, Huamei; Chen, Dengfu; Long, Mujun; Li, Yandong
- Abstract
Basic oxygen furnace (BOF) slag is an industrial waste produced from steel-making. It can be utilized as building material, but its high content of free CaO (f-CaO) causes volume expansion of materials and limits its utilization. However, carbonation of BOF slag can decrease the f-CaO content, improve stability, and reduce carbon emissions. This study investigated the influence of temperature, pressure, liquid to solid, reaction time, and stirring pattern on f-CaO consumption and CO2 sequestration, which reached a maximum f-CaO consumption and CO2 sequestration of 99.58% and 5.12% (51.2 g CO2/Kg BOF slag), respectively, under optimum conditions. According to the results of the XRD patterns of carbonated slag, no peaks of CaO were detected, the peaks of Ca2Fe2O5 and Ca2SiO4 were slightly reduced, and new peaks of CaCO3 were detected. The reaction process has been described by a shrinking core model revealing that the diffusion of reactants through the product layer was the rate-limiting step for carbonation. The kinetic equation for CO2 sequestration was derived as: InK = − 2132.83·T−1–9.1543. This approach presents a green, cost-effective, and rapid method for enhancing steel slag utilization while capturing and storing CO2. The method proposed in this paper holds significant potential for wider adoption.
- Subjects
BASIC oxygen furnaces; HIGH temperatures; CARBONATION (Chemistry); SLAG; INDUSTRIAL wastes; CARBON emissions; X-ray diffraction
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2024, Vol 76, Issue 7, p3415
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-024-06593-4