Process mechanism research on direct vortex melting reduction of vanadium–titanium magnetite  

作　　者：Yong-chao Han Zhi-he Dou Zhan-ning Yang Wei Xie Ting-an Zhang 

机构地区：[1]Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education),Shenyang,110819,Liaoning,China [2]School of Metallurgy,Northeastern University,Shenyang,110819,Liaoning,China

出　　处：《Journal of Iron and Steel Research International》2025年第3期536-549,共14页钢铁研究学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(U1908225);the Fundamental Research Funds for Central Universities(N2225012 and N232405-06).

摘　　要：In response to the new mechanism of direct vortex melting reduction of vanadium–titanium magnetite,the reaction control mechanism and the migration regularity of valuable components in the process of direct melting reduction were investigated using kinetic empirical equation by fitting and combining with X-ray diffraction,X-ray fluorescence,scanning electron microscopy,energy-dispersive spectrometry,and optical microscopy.The results show that iron reduction is controlled by the mass transfer process of(FeOx)in the slag,while vanadium reduction is controlled by both the mass transfer of(VOx)in the slag and the mass transfer of[V]in the molten iron,and the slag–metal interfacial reaction is the only pathway for vanadium reduction.The reduction of iron and vanadium is an obvious first-order reaction,with activation energy of 101.6051 and 197.416 kJ mol^(−1),respectively.Increasing the vortex rate and reaction temperature is beneficial to improving the reaction rate and reduction efficiency.The mineral phase variation of iron and vanadium in the slag during the reduction process is Fe_(2)O_(3)→Fe_(3)O_(4)/FeV_(2)O_(4)→FeTiO_(3) and FeV_(2)O_(4)→MgV_(2)O_(5);titanium in slag is mainly in the form of Mg_(x)Ti_(3−x)O_(5)(0≤x≤1)and CaTiO_(3).As the reaction time went on,the molar ratio(nTi/nMg)in Mg_(x)Ti_(3−x)O_(5)(0≤x≤1)and the Ti2O_(3) content in the slag gradually went up,while the area proportion of Mg_(x)Ti_(3−x)O_(5)(0≤x≤1)went up and then down,and the porosity of the slag and the grain size of Mg_(x)Ti_(3−x)O_(5)(0≤x≤1)got smaller.

关 键 词：Vanadium-titanium magnetite Vortex melting reduction KINETICS Reduction process mechanism 

分 类 号：TF55[冶金工程—钢铁冶金]