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Reduction Mechanism of P2O5 in Steel Slag

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Abstract

The high P content in steel slag limits its use in the next heats of steelmaking. Therefore, in this experiment, P2O5-containing slag was reduced by carbon at high temperatures in the flowing N2 and P-containing substances in the off-gas were water-cooled and collected. Both XRD analysis and thermodynamic calculations indicate that the reduction products are mainly composed of P2. The analysis with scanning electron microscope shows that the plate-like 2CaO·SiO2 and 3CaO·SiO2 phases in the steel slag were smashed into granular shape by the gas (P2 and CO) generated during the reduction. The reduction of P2O5 in the P-rich 2CaO·SiO2 and 3CaO·SiO2 phases in the steel slag is insufficient, while that in P-lean RO phase is complete. The single-factor experiments proves that the phosphorus vaporization rate increases with the moderate increase in temperature, FeO content and N2 flow rate, but decreases with the increase in of basicity.

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Acknowledgements

Funding was provided by Tangshan Key Laboratory of Special Metallurgy and Material Manufacture (Grant No. 17130202D).

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Authors and Affiliations

  1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan, 063009, Hebei, China

    Yuekai Xue, Chenxiao Li, Dingguo Zhao & Shuhuan Wang

  2. Tangshan City Special Metallurgy and Material Preparation Laboratory, Tangshan, 063009, Hebei, China

    Yuekai Xue, Chenxiao Li, Dingguo Zhao & Shuhuan Wang

  3. Tang Steel International Engineering Technology Corp, Tangshan, 063009, Hebei, China

    Peng Tian

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  1. Yuekai Xue
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  2. Peng Tian
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Correspondence to Shuhuan Wang.

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Xue, Y., Tian, P., Li, C. et al. Reduction Mechanism of P2O5 in Steel Slag. Trans Indian Inst Met 73, 251–258 (2020). https://doi.org/10.1007/s12666-019-01829-3

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