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| Preparation of Fe3Si and FeSi intermetallic compounds from copper slag by electrochemical method |
| Hui Li1, Chao-long Xue1, Yu Yang2, Jing-long Liang1 |
| 1 Key Laboratory of Ministry of Education for Modern Metallurgy Technology and College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063009, Hebei, China 2 Comprehensive Testing and Analyzing Center, North China University of Science and Technology, Tangshan 063009, Hebei, China |
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Abstract Fe3Si and FeSi intermetallic compounds were prepared by CaCl2–NaCl melt electrolysis at 800 oC 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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| Cite this article: |
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Hui Li,Chao-long Xue,Yu Yang, et al. Preparation of Fe3Si and FeSi intermetallic compounds from copper slag by electrochemical method[J]. Journal of Iron and Steel Research International, 2023, 30(02): 305-316.
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2023, Vol. 30 
