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Experimental and Mechanism Research on Vacuum Carbothermal Reduction of Zinc-Containing Electric Arc Furnace Dust

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Abstract

The vacuum carbothermal reduction of Zn electric arc furnace dust (EAFD) was investigated using x-ray diffraction, SEM imaging, EDS-mapping, x-ray photoelectron spectroscopy, thermogravimetric analysis, and chemical titration. In vacuum, 96.29% of Zn in EAFD was reduced and volatilized, and the maximum mass loss of EAFD occurred at 1000°C, which was lower than that in argon. In vacuum, the reduction of ZnFe2O4 to Fe3O4 and ZnO was initiated at 700°C. As the temperature increased from 700°C to 800°C, the reduction of Fe3O4 to FeO was initiated, whereas K salts in EAFD were completely volatilized and accumulated in a condenser. At 850°C, ZnFe2O4 and Fe3O4 were completely reduced, and the reduction of FeO and ZnO was initiated. At 1000°C, ZnO and FeO were completely reduced, and Zn was volatilized and accumulated in a condenser, whereas metal Fe remained in the slag to form a Fe-rich slag.

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Acknowledgements

The authors are especially grateful for the financial support from the National Natural Science Fund of China (No. 52064010) and the cultivation project of Guizhou University (2019) No. 07.

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Authors and Affiliations

  1. School of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China

    Xuan He, Shufang Xie, Xianfen Li, Xiaodong Lv & Run Huang

  2. Guizhou Province Key Laboratory of Metallurgical Engineering and Energy Process Saving, Guiyang, 550025, China

    Xuan He, Shufang Xie, Xianfen Li, Xiaodong Lv & Run Huang

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  1. Xuan He
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Correspondence to Run Huang.

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He, X., Xie, S., Li, X. et al. Experimental and Mechanism Research on Vacuum Carbothermal Reduction of Zinc-Containing Electric Arc Furnace Dust. JOM 74, 3039–3048 (2022). https://doi.org/10.1007/s11837-022-05375-0

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  • DOI: https://doi.org/10.1007/s11837-022-05375-0

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