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Effect of physicochemical properties and feed mix ratios on the carbothermic reductions of iron ore with coke

  • S.R.R. Munusamy (Faculty of Chemical Engineering & Technology (FKTK), Universiti Malaysia Perlis) ;
  • S. Manogaran (Faculty of Chemical Engineering & Technology (FKTK), Universiti Malaysia Perlis) ;
  • F. Abdullah (Faculty of Chemical Engineering & Technology (FKTK), Universiti Malaysia Perlis) ;
  • N.A.M. Ya'akob (Faculty of Chemical Engineering & Technology (FKTK), Universiti Malaysia Perlis) ;
  • K. Narayanan (Faculty of Chemical Engineering & Technology (FKTK), Universiti Malaysia Perlis)
  • 투고 : 2023.07.31
  • 심사 : 2024.01.05
  • 발행 : 2024.06.25

초록

This study aimed to investigate the effect of physicochemical properties and mix ratios of iron ore (oxide feed): coke (reductant) on the carbothermic reductions of iron ore. Coke size was fixed at ≤63 ㎛ while iron ore size varied between 150-63 ㎛ and ≤63 ㎛ respectively. Mix ratios were changed from 100:0 (reference) to 80:20 and 60:40 while the temperature, heating rate and soaking duration in muffle furnace were fixed at 1100 ℃, 10 ℃/min and 1 hour. Particle size analyzer, XRF, CHNS and XRD analyses were used for determination of raw feed characteristics. The occurrence of phase transformations from various forms of iron oxides to iron during the carbothermal reductions were identified through XRD profiles and supported with weight loss (%). XRF analysis proved that iron ore is of high grade with 93.4% of Fe2O3 content. Other oxides present in minor amounts are 2% Al2O3 and 1.8% SiO2 with negligible amounts of other compounds such as MnO, K2O and CuO. Composite pellet with finer size iron particles (≤63 ㎛) and higher carbon content of 60:40 exhibited 45.13% weight lost compared to 32.30% and 3.88% respectively for 80:20 and 100:0 ratios. It is evident that reduction reactions can only occur with the presence of coke, the carbon supply. The small weight loss of 3.88% at 100:0 ratio occurs due to the removal of moisture and volatiles and oxidations of iron ore. Higher carbon supply at 60:40 leads into better heat and mass transfer and diffusivity during carbothermic reductions. Overall, finer particle size and higher carbon supply improves reactivity and gas-solid interactions resulting in increased reductions and phase transformations.

키워드

과제정보

The authors would like to thank Universiti Malaysia Perlis (UNIMAP) and Faculty of Chemical Engineering & Technology (FKTK) for lab equipment and testing machines.

참고문헌

  1. Babich, A. and Senk, D. (2013), "Coal use in iron and steel metallurgy", The Coal Handbook: Towards Cleaner Production, Woodhead Publishing Limited, Sawston, Cambridge, UK.
  2. Balasubramaniam, A. (2015), "Overview of mineral processing methods", Technical Report of Centre for Advanced Studies in Earth Science, University of Mysore, Mysore, India.
  3. Dworzanowski, M. (2013), "The role of metallurgy in enhancing beneficiation in the South African mining industry", J. South. Africa Inst. Min. Metall., 113(9), 677-683.
  4. Ghosh, A. and Chatterjee, A. (2010), Ironmaking and Steelmaking, Theory and Practice, PHI Learning Private Limited, New Delhi, India.
  5. Gupta, C.K. (2003), Chemical Metallurgy Principles and Practice, Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, Germany.
  6. Habashi, F. (1997), Handbook of Extractive Metallurgy, Vol. I: The Metal Industry Ferrous Metals, WileyVCH, Weinheim, Germany.
  7. Heidari, A., Niknahad, N., Iljana, M. and Fabritius, T. (2021), "A review on the kinetics of iron ore reduction by hydrogen", Mater., 14(24), 7540. https://doi.org/10.3390/ma14247540.
  8. Hou, B., Zhang, H., Li, H. and Zhu, Q. (2012), "Study on kinetics of iron oxide reduction by hydrogen", Chin. J. Chem. Eng., 20(1), 10-17. https://doi.org/10.1016/S1004-9541(12)60357-7.
  9. Li, Y., Han, Y., Sun, Y., Gao, P., Li, Y. and Gong, G. (2018), "Growth behavior and size characterization of metallic iron particles in coal-based reduction of oolitic hematite-coal composite briquettes", Minerals, 8(5), 177. https://doi.org/10.3390/min8050177.
  10. Liu, Y., Zhang, X., Gao, M., Hu, X. and Guo, Q. (2019), "Effect of coal ash on Fe-based oxygen carrier in coal char chemical looping gasification", Int. J. Chem. Reactor Eng., 17(8), 20180270. https://doi.org/10.1515/ijcre-2018-0270.
  11. Man, Y. and Feng, J.X. (2016), "Effect of iron ore-coal pellets during reduction with hydrogen and carbon monoxide", Powder Tech., 301, 1213-1217. https://doi.org/10.1016/j.powtec.2016.07.057.
  12. Man, Y., Feng, J.X., Chen, Y.M. and Zhao, J.Z. (2014a), "Mass loss and direct reduction characteristics of iron ore-coal composite pellets", J. Iron Steel Res. Int., 21(12), 1090-1094. https://doi.org/10.1016/S1006-706X(14)60188-6.
  13. Man, Y., Feng, J.X., Li, F.J., Ge, Q., Chen, Y.M. and Zhao, J.Z. (2014b), "Influence of temperature and time on reduction behavior in iron ore-coal composite pellets", Powder Tech., 256, 361-366. https://doi.org/10.1016/j.powtec.2014.02.039.
  14. Palaniandy, S. and Azizli, K.A.M. (2009), "Mechanochemical effect on talc during fine grinding process in a jet mill", Int. J. Min. Pro., 92, 22-33. https://doi.org/10.1016/j.minpro.2009.02.008.
  15. Pineau, A., Kanari, N. and Gaballah, I. (2006), "Kinetics of reduction of iron oxides by H2. Part 1: Low temperature reduction of hematite", Thermochim. Acta, 447, 89-100. https://doi.org/10.1016/j.tca.2005.10.004.
  16. Pourghahramani, P. and Forssberg, E. (2007), "Effects of mechanical activation on the reduction behavior of hematite concentrate", Int. J. Min. Pro., 82, 96-105. https://doi.org/10.1016/j.minpro.2006.11.003.
  17. Spreitzer, D. and Schenk, J. (2019), "Reduction of iron oxides with hydrogen-A review", Steel Res. Int., 90(10), 1900108. https://doi.org/10.1002/srin.201900108.
  18. unal, H.I., Turgut, E., Atapek, S.H. and Alkan, A. (2015), "Direct reduction of ferrous oxides to form an ironrich alternative charge material", High Temp. Mater. Pr., 34(8), 751-756. https://doi.org/10.1515/htmp2014-0125.
  19. Whitworth, A.J., Vaughan, J., Southam, G., Van der Ent, A., Nkrumah, P.N., Ma, X. and Parbhakar-Fox, A. (2022), "Review on metal extraction technologies suitable for critical metal recovery from mining and processing wastes", Minerals Eng., 182, 107537. https://doi.org/10.1016/j.mineng.2022.107537.
  20. Wills, B.A. and Munn, T.N. (2006), Mineral Processing Technology: An Introduction to the Practical Aspect of Ore Treatment and Mineral Recovery, 7th Edition, Elsevier Science and Technology Books, Amsterdam, Netherlands.