Advertisement

Thermal performance and reduction kinetic analysis of cold-bonded pellets with CO and H2 mixtures

  • Rong-rong Wang
  • Jian-liang Zhang
  • Yi-ran Liu
  • An-yang Zheng
  • Zheng-jian Liu
  • Xing-le Liu
  • Zhan-guo Li
Article

Abstract

Cold-bonded pellets, to which a new type of inorganic binder was applied, were reduced by H2–CO mixtures with different H2/CO molar ratios (1:0, 5:2, 1:1, 2:5, and 0:1) under various temperatures (1023, 1123, 1223, 1323, and 1423 K) in a thermogravimetric analysis apparatus. The effects of gas composition, temperature, and binder ratio on the reduction process were studied, and the microstructure of reduced pellets was observed by scanning electron microscopy–energy-dispersive spectrometry (SEM-EDS). The SEM-EDS images show that binder particles exist in pellets in two forms, and the form that binder particles completely surround ore particles has a more significant hinder effect on the reduction. The reduction equilibrium constant, effective diffusion coefficient, and the reaction rate constant were calculated on the basis of the unreacted core model, and the promotion effect of temperature on reduction was further analyzed. The results show that no sintering phenomenon occurred at low temperatures and that the increasing reaction rate constant and high gas diffusion coefficient could maintain the promotion effect of temperature; however, when the sintering phenomenon occurs at high temperatures, gas diffusion is hindered and the promotion effect is diminished. The contribution of the overall equilibrium constant to the promotion effect depends on the gas composition.

Keywords

cold-bonded pellets inorganic binder reduction fraction reduction kinetic model sintering phenomenon 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Notes

Acknowledgements

This work was financially supported by the National Key Research and Development Program of China (2017YFB0304300 and 2017YFB0304302) and the 111 Project (No. B13004).

References

  1. [1]
    R. Petela, W. Hutny, and J.T. Price, Energy and exergy consumption and CO2 emissions in an ironmaking process, Adv. Environ. Res., 6(2002), 2, p. 157.CrossRefGoogle Scholar
  2. [2]
    C.H. Rhee, J.Y. Kim, K. Han, C.K. Ahn, and H.D. Chun, Process analysis for ammonia-based CO2 capture in ironmaking industry, Energy Procedia, 4(2011), p. 1486.CrossRefGoogle Scholar
  3. [3]
    K.J. Li, J.L. Zhang, Y.P. Zhang, Z.J. Liu, and X. Jiang, Analysis on development of iron-making process based on the principle of energy-saving and emission reduction, Chin. J. Process Eng., 14(2014), 1, p. 162.CrossRefGoogle Scholar
  4. [4]
    F. Chen, Y. Mohassab, T. Jiang, and Y.S. Hong, Hydrogen reduction kinetics of hematite concentrate particles relevant to a novel flash ironmaking process, Metall. Mater. Trans, B, 46(2015), 3, p. 1133.CrossRefGoogle Scholar
  5. [5]
    G.Z. Qiu, T. Jiang, Z.C. Huang. D.Q. Zhu, and X.H. Fan, Characterization of preparing cold bonded pellets for direct reduction using an organic binder, ISIJ Int., 43(2003), 1, p. 20.CrossRefGoogle Scholar
  6. [6]
    R.R. Wang, J.L. Zhang, Y.R. Liu, Z.J. Liu, X.L. Liu, and N.Y. Li, Effects of an inorganic binder on the strength property of cold-bonded pellets, Metall. Res. Technol., 114(2017), 6, p. 604.CrossRefGoogle Scholar
  7. [7]
    Z.C. Huang, L.Z. Zhao, L.Y. Yi, and T. Jiang, Research of the behavior of iron ore pellet on low temperature reduction degradation in gas-based direct reduction process, Met. Mine, (2013), No. 3, p. 69.Google Scholar
  8. [8]
    P. Wang, Z.Y. Jiang, X.X. Zhang, X.Y. Geng, and S.Y. Hao, Long-term scenario forecast of production routes, energy consumption and emissions for Chinese steel industry, J. Univ. Sci. Technol. Beijing, 36(2014), 12, p. 1683.Google Scholar
  9. [9]
    B.B. Agrawal, K.K. Prasad, S.B. Sarkar, and H.S. Ray, Cold bonded ore-coal composite pellets for sponge ironmaking: Part 1. Laboratory scale development, Ironmaking Steelmaking, 27(2000), 6, p. 421.CrossRefGoogle Scholar
  10. [10]
    B.B. Agrawal, K.K. Prasad, S.B. Sarkar, and H.S. Ray, Cold bonded ore-coal composite pellets for sponge ironmaking: Part 2. Plant trials in rotary kiln, Ironmaking Steelmaking, 28(2001), 1, p. 23.CrossRefGoogle Scholar
  11. [11]
    N.A. El-Hussiny and M.E.H. Shalabi, A self-reduced intermediate product from iron and steel plants waste materials using a briquetting process, Powder Technol., 205(2011), No. 1–3, p. 217.CrossRefGoogle Scholar
  12. [12]
    E. Cevik, H. Ahlatci, and Y. Sun, Characterization and reduction behavior of cold-bonded composite pellets for direct reduction using an organic binder, Metallurgist, 57(2013), No. 5–6, p. 468.CrossRefGoogle Scholar
  13. [13]
    R. Robinson, High temperature properties of by-product cold bonded pellets containing blast furnace flue dust, Thermochim. Acta, 432(2005), 1, p. 112.CrossRefGoogle Scholar
  14. [14]
    A. Pineau, N. Kanari, and I. Gaballah, Kinetics of reduction of iron oxides by H2: Part I: Low temperature reduction of hematite, Thermochim. Acta, 447(2006), 1, p. 89.CrossRefGoogle Scholar
  15. [15]
    A. Pineau, N. Kanafi, and I. Gaballah, Kinetics of reduction of iron oxides by H2: Part II.Low temperature reduction of magnetite, Thermochim. Acta, 456(2007), 2, p. 75.CrossRefGoogle Scholar
  16. [16]
    E.A. Mousa, A. Babich, and D. Senk, Reduction behavior of iron ore pellets with simulated coke oven gas and natural gas, Steel Res. Int., 84(2013), 11, p. 1085.CrossRefGoogle Scholar
  17. [17]
    Q.J. Gao, F.M. Shen, X. Jiang, G. Wei, and H.Y, Zheng, Gas-solid reduction kinetic model of MgO-fluxed pellets, Int. J. Miner. Metall. Mater., 21(2014), 1, p. 12.CrossRefGoogle Scholar
  18. [18]
    H.B. Zuo, C. Wang, J.J. Dong, K.X. Jiao, and R.S. Xu, Reduction kinetics of iron oxide pellets with H2 and COmixtures, Int. J. Miner. Metall. Mater., 22(2015), 7, p. 688.CrossRefGoogle Scholar
  19. [19]
    Z.L. Zhang, Q. Li, and Z.S. Zou, Reduction properties of high alumina iron ore cold bonded pellet with CO-H2 mixtures, Ironmaking Steelmaking, 41(2014), 8, p. 561.CrossRefGoogle Scholar
  20. [20]
    T. Usui, M. Naito, T. Murayama, and Z. Morita, Kinetic analysis on gaseous reduction of agglomerates, Part 1, Reaction models for gaseous reduction of agglomerates, Tetsu-to-Hagane, 80(1994), 6, p. 431.CrossRefGoogle Scholar
  21. [21]
    T. Murayama, T. Usui, M. Naito, and Y. Ono, Kinetic analysis on gaseous reduction of agglomerates, Part 2, Rate parameters included in the mathematical model for gaseous reduction of agglomerates, Tetsu-to-Hagane, 80(1994), 7, p. 493.CrossRefGoogle Scholar

Copyright information

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

Authors and Affiliations

  • Rong-rong Wang
    • 1
  • Jian-liang Zhang
    • 1
  • Yi-ran Liu
    • 2
  • An-yang Zheng
    • 1
  • Zheng-jian Liu
    • 1
  • Xing-le Liu
    • 1
  • Zhan-guo Li
    • 1
  1. 1.School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijingChina
  2. 2.School of Chemical EngineeringUniversity of New South WalesSydneyAustralia

Personalised recommendations