Reduction mechanism of high-chromium vanadium-titanium magnetite pellets by H2-CO-CO2 gas mixtures

Jue Tang, Man-sheng Chu, Feng Li, Ya-ting Tang, Zheng-gen Liu, Xiang-xin Xue

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    Jue Tang, Man-sheng Chu, Feng Li, Ya-ting Tang, Zheng-gen Liu, and Xiang-xin Xue, Reduction mechanism of high-chromium vanadium-titanium magnetite pellets by H2-CO-CO2 gas mixtures, Int. J. Miner. Metall. Mater., 22(2015), No. 6, pp.562-572. https://dx.doi.org/10.1007/s12613-015-1108-9
    Jue Tang, Man-sheng Chu, Feng Li, Ya-ting Tang, Zheng-gen Liu, and Xiang-xin Xue, Reduction mechanism of high-chromium vanadium-titanium magnetite pellets by H2-CO-CO2 gas mixtures, Int. J. Miner. Metall. Mater., 22(2015), No. 6, pp.562-572. https://dx.doi.org/10.1007/s12613-015-1108-9
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    Reduction mechanism of high-chromium vanadium-titanium magnetite pellets by H2-CO-CO2 gas mixtures

    • School of Material and Metallurgy, Northeastern University, Shenyang, 110819, China

    基金项目: 

    This work was financially supported by the National Natural Science Foundation of China (No. 51090384), the National High-Tech Research and Development Program of China (No. 2012AA062302), and the Fundamental Research Funds for the Central Universities of China (Nos. N110202001 and N130602003).

      通信作者:

      Man-sheng Chu E-mail: chums@smm.neu.edu.cn

    中文摘要

    The reduction of high-chromium vanadium-titanium magnetite as a typical titanomagnetite containing 0.95wt% V2O5 and 0.61wt% Cr2O3 by H2-CO-CO2 gas mixtures was investigated from 1223 to 1373 K. Both the reduction degree and reduction rate increase with increasing temperature and increasing hydrogen content. At a temperature of 1373 K, an H2/CO ratio of 5/2 by volume, and a reduction time of 40 min, the degree of reduction reaches 95%. The phase transformation during reduction is hypothesized to proceed as follows:Fe2O3 → Fe3O4 → FeO → Fe; Fe9TiO15 + Fe2Ti3O9 → Fe2.75Ti0.25O4 → FeTiO3 → TiO2; (Cr0.15V0.85)2O3 → Fe2VO4; and Cr1.3Fe0.7O3 → FeCr2O4. The reduction is controlled by the mixed internal diffusion and interfacial reaction at the initial stage; however, the interfacial reaction is dominant. As the reduction proceeds, the internal diffusion becomes the controlling step.

     

    Reduction mechanism of high-chromium vanadium-titanium magnetite pellets by H2-CO-CO2 gas mixtures

    Author Affilications

      • School of Material and Metallurgy, Northeastern University, Shenyang, 110819, China

    • Funds: 

      This work was financially supported by the National Natural Science Foundation of China (No. 51090384), the National High-Tech Research and Development Program of China (No. 2012AA062302), and the Fundamental Research Funds for the Central Universities of China (Nos. N110202001 and N130602003).

    • Received: 30 October 2014; Revised: 23 December 2014; Accepted: 28 February 2015;
    The reduction of high-chromium vanadium-titanium magnetite as a typical titanomagnetite containing 0.95wt% V2O5 and 0.61wt% Cr2O3 by H2-CO-CO2 gas mixtures was investigated from 1223 to 1373 K. Both the reduction degree and reduction rate increase with increasing temperature and increasing hydrogen content. At a temperature of 1373 K, an H2/CO ratio of 5/2 by volume, and a reduction time of 40 min, the degree of reduction reaches 95%. The phase transformation during reduction is hypothesized to proceed as follows:Fe2O3 → Fe3O4 → FeO → Fe; Fe9TiO15 + Fe2Ti3O9 → Fe2.75Ti0.25O4 → FeTiO3 → TiO2; (Cr0.15V0.85)2O3 → Fe2VO4; and Cr1.3Fe0.7O3 → FeCr2O4. The reduction is controlled by the mixed internal diffusion and interfacial reaction at the initial stage; however, the interfacial reaction is dominant. As the reduction proceeds, the internal diffusion becomes the controlling step.

     

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