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
Preparation of Fe3Si and FeSi intermetallic compounds from copper slag by electrochemical method
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
摘要 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.
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.
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.