Abstract
Bayer red mud is characterized by its highly oxidizing nature and high alkalinity. It can act as an ideal flux and dephosphorizer in steelmaking. In this study, pilot-scale tests applying the Bayer red mud-based flux in steelmaking have been conducted in a 200-kg, medium-frequency induction furnace. Good slag fluidity and no rephosphorization phenomena are observed. High dephosphorization rates (~90%) and low final [P] (<0.02%) are obtained in the situation of high [C] of 2.0–3.0%, which are of great importance for the production of clean steel. The P2O5 content in the P-rich phase in the red mud-based slag can reach as high as 34.05 wt.%, far higher than the 6.73 wt.% in ordinary industrial slag. This suggests that the Al2O3, TiO2 in Bayer red mud can enhance the solid solubility of phosphorus in the P-rich phase. The data obtained are important for promoting the large-scale application of red mud in steelmaking.
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Acknowledgements
The authors would like to thank the National Natural Science Foundation of China (No. 51474021) and the Aluminum Corporation of China Limited for financial support.
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Li, F., Zhang, Y. & Guo, Z. Pilot-Scale Test of Dephosphorization in Steelmaking Using Red Mud-Based Flux. JOM 69, 1624–1631 (2017). https://doi.org/10.1007/s11837-017-2449-9
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DOI: https://doi.org/10.1007/s11837-017-2449-9