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Isothermal Oxidation Kinetics of Artificial Magnetite Pellets

  • Hanquan Zhang (张汉泉)
  • Jintao Fu
  • Jian Pan (潘建)Email author
  • Feng Zhang (张峰)Email author
  • Zhengqi Guo
Metallic Materials
  • 8 Downloads

Abstract

In order to establish the kinetics of oxidation of artificial magnetite pellets, we comprehensively studied kinetics of the oxidation of artificial magnetite pellets from low temperature to high temperature using chemical analysis. The results show that when the oxidation temperature is below 1 073 K (800 °C), the reaction is controlled by the step of internal diffusion, and the model function is 2 G(a) = 1−3(1−x)2/3 + 2(1−x) (α, reaction degree). When the temperature is above 1 073 K (800 °C), the reaction mechanism was chemical reaction, and the model function is 1 G(a) = 1−(1−x)1/3. The apparent activation energy for the oxidation of artificial magnetite pellets was also determined, which was 8.90 kJ/mol for the low temperature and 67.79 kJ/mol for the high temperature. Based on the derived kinetic equation for the oxidation of artificial magnetite pellets, the calculated value is consistent with the experimental data. Compared with that of nature magnetite pellets, the apparent activation energy is decreased obviously, which indicates that the artificial magnetite pellets are oxidized more easily than nature magnetite pellets.

Key words

artificial magnetite pellets oxidation kinetics shrinking 

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References

  1. [1]
    Liu B. Research of the Mathematical Model and Development of the Simulation Software of the Pellet Productive Process[D]. Shenyang: Northeastern University, 2012(in Chinese)Google Scholar
  2. [2]
    Zhu DQ, Luo YH, Pan J, et al. Study on High Temperature Oxidation Kinetics of Magnetite[J]. Metal Mine, 2011, 04(04): 89–93 (in Chinese)Google Scholar
  3. [3]
    Zhang HQ, Lu MM, Fu JT. Oxidation and Roasting Characteristics of Artificial Magnetite Pellets[J]. Journal of Central South University (Science and Technology), 2016, 23(11): 2 999–3 005CrossRefGoogle Scholar
  4. [4]
    Zhang HQ, Wang FL. Analysis of Surface Wettability of Synthetic Magnetite[J]. Journal of Wuhan University of Technology–Materials Science Edition, 2014, 29(4): 679–683CrossRefGoogle Scholar
  5. [5]
    Zhu DQ, Yu W, Zhou XL, et al. Strengthening Pelletization of Manganese Ore Fines Containing High Combined Water by High Pressure Roll Grinding and Optimized Temperature Elevation[J]. Journal of Central South University, 2014, 21: 3 485–3 491CrossRefGoogle Scholar
  6. [6]
    Chen XL, Huang YX, Fan XH, et al. Oxidation Roasting Behavior and Concretion Properties of Vanadium–titanium Magnetite Pellet[J]. Journal of Central South University (Science and Technology), 2016, 47(2): 359–366Google Scholar
  7. [7]
    Lu MM. Study on Difference of Ballability between Artificial Magnetite and Natural Magnetite[D]. Wuhan: Wuhan Institute of Technology, 2015 (in Chinese)Google Scholar
  8. [8]
    Zhang HQ. Analysis on Thermal Operation of a Grate Kiln for Oxidized Pellet[J]. China Metallurgy, 2006, 16(2): 12–15(in Chinese)Google Scholar
  9. [9]
    Yur’ev BP, Spirin NA. Oxidation of Iron–ore Pellets[J]. Steel in Translation, 2011, 41(5): 400–403CrossRefGoogle Scholar
  10. [10]
    Chen KY, Jia YZ, Liang DL, et al. Influence of Pellet Preheating System on Pellet Strength[J]. Research on Iron and Steel, 2014, 42(6): 1–4 (in Chinese)Google Scholar
  11. [11]
    Forsmo SPE, Forsmo SE, Samskog PO, et al. Mechanisms in Oxidation and Sintering of Magnetite Iron Ore Green Pellets[J]. Powder Technology, 2008, 183(2): 247–259CrossRefGoogle Scholar
  12. [12]
    Qiu GZ, Zhu DQ, Pan J, et al. Improving the Oxidizing Kinetics of Pelletization of Magnetite Concentrate by High Press Roll Grinding[J]. ISIJ International, 2004, 44(1): 69–73CrossRefGoogle Scholar
  13. [13]
    Liang RQ, Yang S, Yan FS, et al. Kinetics of Oxidation Reaction for Magnetite Pellets[J]. Journal of Iron & Steel Research International, 2013, 20(9): 16–20CrossRefGoogle Scholar
  14. [14]
    Hua YX. Introduction to Kinetics of Process Metallurgy[M]. Beijing: Metallurgical Industry Press, 2004: 136–186 (in Chinese)Google Scholar
  15. [15]
    Papanastassiou F, Bitsianes G. Modelling of Heterogeneous Gas–solid Reactions[J]. Metallurgical Transactions, 1973, 4(2): 477–486CrossRefGoogle Scholar
  16. [16]
    Papanastassiou D, Bitsianes G. Mechanisms and Kinetics Underlying the Oxidation of Magnetite in the Induration of Iron ore Pellets[J]. Metallurgical & Materials Transactions B, 1973, 4(2):487–496Google Scholar
  17. [17]
    Fu JY, Li YT, Jiang CW, et al. Oxidation Kinetics of Magnetite Concentrate Pellets[J]. Journal of Central South University (Science and Technology), 2004, 35(6): 950–954 (in Chinese)Google Scholar
  18. [18]
    Sandeep Kumar TK, Viswanathan NNI, Ahmed HM, et al. Estimation of Sintering Kinetics of Oxidized Magnetite Pellet Using Optical Dilatometer[J]. Metallurgical and Materials Transactions B, 2015,46B (4): 635–642Google Scholar
  19. [19]
    Cho HJ, Tang M, Pistorius PC. Magnetite Particle Size Distribution and Pellet Oxidation[J]. Metallurgical and Materials Transactions B, 2014, 45B (8): 1 213–1 219Google Scholar
  20. [20]
    Han GH, Jiang T, Zhang YB, et al. High–Temperature Oxidation Behavior of Vanadium Titanium–Bearing Magnetite Pellet[J]. Journal of Iron and Steel Research, International, 2011, 18(8): 14–19CrossRefGoogle Scholar

Copyright information

© Wuhan University of Technology and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Xingfa Mining EngineeringWuhan Institute of TechnologyWuhanChina
  2. 2.Western Mining CompanyXiningChina
  3. 3.School of Minerals Processing and BioengineeringCentral South UniversityChangshaChina

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