Preparation of Fe_(3)Si and FeSi intermetallic compounds from copper slag by electrochemical method  

作　　者：Hui Li Chao-long Xue Yu Yang Jing-long Liang 

机构地区：[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

出　　处：《Journal of Iron and Steel Research International》2023年第2期305-316,共12页

基　　金：This work was supported by the National Natural Science Foundation of China(No.52174315).

摘　　要：Fe_(3)Si and FeSi intermetallic compounds were prepared by CaCl_(2)-NaCl melt electrolysis at 800℃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 Fe_(3)Si 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 Fe_(3)Si and FeSi intermetallic compounds is a gradual evolution process with the increase in Si content,following the formation law of Fe→FeSi→Fe_(3)Si+FeSi→FeSi.The metallic impurities of the final product were 1.29 wt.%Mg and 3.85 wt.%Al,respectively.

关 键 词：FERROALLOY Intermetallic compound Molten salt electrolysis Copper slag Formation process 

分 类 号：TG146[一般工业技术—材料科学与工程]