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- Title
Acid Leaching for Phosphorus Separation from the Co-processing of Dephosphorization Slag and Basic Oxygen Furnace Slag: Kinetics Investigation.
- Authors
Yu, Yao-hui; Du, Chuan-ming; Zhang, Yu-tang
- 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.
- Subjects
BASIC oxygen furnaces; SLAG; LEACHING; STEEL mills; ACTIVATION energy; RAW materials; DIFFUSION control
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2024, Vol 76, Issue 5, p2501
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-024-06442-4