| Citation: |
PI Jianqing, WANG Mingli, ZHANG Yanling, ZHAO Hongbo, YU Kan, LI Geng. Influence of Al2O3/TiO2/Na2O on lime dissolution in steelmaking slag[J]. Nonferrous Metals Science and Engineering, 2025, 16(1): 1-7. DOI: 10.13264/j.cnki.ysjskx.2025.01.001
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A red mud-based flux containing Al2O3, TiO2, and Na2O constituents exhibits a pronounced flux-enhancing effect on traditional steelmaking slag systems. Therefore, the research on the dissolution mechanism of lime in steelmaking slag and the factors influencing its dissolution rate is significant in advancing the development of fluoride-free fluxes in steelmaking. In this experiment, the dissolution rate of lime in steelmaking slag containing Al2O3, TiO2, and Na2O was measured using the cylindrical rotation method, and analysis and demonstration of mineral phase changes during its melting process was conducted. The results indicates that the promotion coefficient for lime dissolution at 1 400 ℃ decreases in the order of Na2O > TiO2 > Al2O3, and adding 10 % Na2O can increase the promotion coefficient for lime dissolution by a factor of seven. Furthermore, this paper explores the effects of Al2O3, TiO2, and Na2O on the diffusion of CaO in the slag and the lime decomposition reaction at the boundary layer, elucidating the dissolution mechanism of lime under these conditions. The concurrent presence of A12O3/TiO2/Na2O in red mud-based flux has been identified as a suitable steelmaking flux.
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