Abstract
Fe3Si and FeSi intermetallic compounds were prepared by CaCl2–NaCl melt electrolysis at 800 °C from the non-magnetic copper slag compound. The phase transition of the cathode particles with different electrolysis voltages and durations was investigated by X-ray fluorescence spectroscopy, inductively coupled plasma spectroscopy, X-ray diffraction, and scanning electron microscopy. The results showed that Fe3Si and FeSi intermetallic compounds can be obtained by one-step electrolysis for 10 h at 3.2 V and two-step electrolysis of 2.5 V for 4 h and 3.2 V for 6 h. However, the current efficiency increased from 31.70% of one-step electrolysis to 39.87% of two-step electrolysis. The formation of Fe3Si and FeSi intermetallic compounds is a gradual evolution process with the increase in Si content, following the formation law of Fe → FeSi → Fe3Si + FeSi → FeSi. The metallic impurities of the final product were 1.29 wt.% Mg and 3.85 wt.% Al, respectively.
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This work was supported by the National Natural Science Foundation of China (No. 52174315).
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Li, H., Xue, Cl., Yang, Y. et al. Preparation of Fe3Si and FeSi intermetallic compounds from copper slag by electrochemical method. J. Iron Steel Res. Int. 30, 305–316 (2023). https://doi.org/10.1007/s42243-022-00880-7
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DOI: https://doi.org/10.1007/s42243-022-00880-7