Abstract
Due to the accumulation of solid wastes, more and more attention has been paid to the recycle and reuse of basic oxygen furnace (BOF) slag. However, CaO contained in the slag will cause cracks, which has limited the use of the slag as raw material in architecture to a large extent. In this study, the preparation of cementitious material with BOF slag has been conducted in lab scale and was enlarged in a 50 kg submerged arc furnace to figure out the feasibility of using it. Through reduction and binary basicity modification, effects of C/O (mole), processing time, and metal recovery have been studied. At 1500 ℃, the higher the C/O, the greater the reduction of Fe, P, and Mn, and the proper C/O was 1.5. With more and more ore tailings added, the slag reduction deteriorated. The reduction speed was lower, while the binary basicity (mass(CaO)/mass(SiO2)) climbed up. The vitrification rate of the modified slag was also lower, so the ore tailing should be more than 17.5% considering the limit of vitrification rate (90.3%). Finally, cementitious properties such as flexural and compressive strength can reach 5.2 and 45.3 MPa separately, which fulfills the request of Portland cement.
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Wang, L., Ren, W., Zhang, X., Han, Z., Li, J. (2022). Modification of Basic Oxygen Furnace Slag Using Iron Ore Tailing and Blast Furnace Dust. In: Peng, Z., et al. 12th International Symposium on High-Temperature Metallurgical Processing. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-92388-4_12
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DOI: https://doi.org/10.1007/978-3-030-92388-4_12
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