Abstract
To realize efficient P removal and resource utilization of steelmaking slag, a synthetic slag with appropriate basicity was produced by co-processing the practical dephosphorization slag and basic oxygen furnace slag. The selective leaching behavior and dissolution kinetics of P were investigated. The results indicated that the P dissolution efficiency and reaction rate were significantly influenced by the variety in stirring rate and pH. However, the decreasing solid/liquid ratio and particle size can significantly enhance the reaction rate, while exerting a slight impact on the P dissolution efficiency. The leaching temperature had less influence on both P dissolution efficiency and reaction rate. Under the optimal leaching conditions, the leaching reaction of the P-condensed phase primarily occurred within the initial 3 min, and, finally, the P dissolution efficiency reached 87.5%, with an extremely low dissolved amount of Fe. After leaching, the Fe-rich residue consisted of massive Fe2O3, MgO, and MnO, with only 0.32% P2O5. This residue can be used as a raw material or flux in steel plants. Furthermore, it was found that the selective leaching of P was controlled by diffusion through the product layer, with the apparent activation energy of 5.80 kJ/mol. The empirical equation has been established.
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Funding
The funding was provided by National Natural Science Foundation of China (Grant No. 52104326) and Fundamental Research Funds for the Central Universities (Grant No. N2225016).
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YY: Data curation, Formal analysis, Investigation, Validation, Writing-original draft. CD: Conceptualization, Data curation, Project administration, Supervision, Writing-review & editing. YZ: Data curation, Formal analysis, Validation.
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Yu, Yh., Du, Cm. & Zhang, Yt. Acid Leaching for Phosphorus Separation from the Co-processing of Dephosphorization Slag and Basic Oxygen Furnace Slag: Kinetics Investigation. JOM 76, 2501–2512 (2024). https://doi.org/10.1007/s11837-024-06442-4
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DOI: https://doi.org/10.1007/s11837-024-06442-4