Skip to main content
SpringerLink
Log in

Characterization and technology of fast reducing roasting for fine iron materials

  • Published:
Journal of Central South University Aims and scope Submit manuscript

Abstract

The features of the techniques of fast reducing roasting (FRR) and conventional magnetic roasting, as well as tremendous demands of iron ores in iron and steel industry of China, were briefly described. The test equipment suitable for FRR of fine-grained materials was introduced. Weakly magnetic materials with grain size of <0.30 mm were converted into strongly magnetic materials by FRR for several to dozens of seconds. In a weakly reducing atmosphere and at 740–800 °C, refractory powder iron material (<0.30 mm) which is rich in specularite, limonite and Mg-Mn siderite was subjected to FRR for a few seconds to 60 s. Concentrate with iron grade of 55.67%–55.21%, high contents of Mg and Mn in the ore is obtained and the yield of magnetic separation reaches 81.66%–86.57%. The results of X-ray diffraction (XRD) analysis and magnetism detection of the material before and after FRR indicate that weakly magnetic material is mainly converted into strongly magnetic material Fe3O4 with specific saturation magnetic moment. The efficiency of FRR is consistent with TFe recovery of magnetic separation; meantime, the specific saturation magnetic moment increases from 33 to 42 times after FRR. Calculations show that speeds of flash magnetic roasting are obtained from several dozen to two or three hundred times, compared with rotary kiln or shaft furnace. This indicates that it is practicable to use the fast reducing roasting technique to improve the comprehensive utilization of iron ore resources.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. LUO Li-qun, ZHANG Jing-sheng. Analysis of the ironmaking raw materials market in China [J]. Journal of Wuhan University of Technology, 2005, 27(9): 67–69. (in Chinese)

    MathSciNet  Google Scholar 

  2. CHENK J L. Recent status of fluidized bed technologies for producing iron input materials for steelmaking [J]. Particuology, 2011, 9(1): 14–21.

    Article  Google Scholar 

  3. LUO Li-qun, ZHANG Jing-sheng. Film-magnetic separation technique to strengthen the separation of complicated weak-magnetic minerals [C]// International Conference of Iron Ore 2005. Fremantle, Australia, 2005: 371–378.

  4. YU Yong-fu. Development trends of iron mines and status and problems of beneficiation technology in China [J]. Mining and Metallurgical Engineering, 2006, 26(1): 21–25. (in Chinese)

    Google Scholar 

  5. CUI Z, LIU Q, ETSELL T H. Magnetic properties of ilmenite, hematite and oilsand minerals [J]. Minerals Engineering, 2002, 15(12): 1121–1129.

    Article  Google Scholar 

  6. ZHANG Jing-sheng, LUO Li-qun. Actuality of magnetic separation technique [J]. Mining and Metallurgical Engineering, 2005, 25(3): 25–29. (in Chinese)

    Google Scholar 

  7. LUO Li-qun, ZHANG Jing-sheng, GAO Yuan-yang. Research on dry cooling magnetic roasting technology for siderite ore [J]. Metal Mine, 2004, (10): 28–31, 35. (in Chinese)

    Google Scholar 

  8. ÇIÇEK B, BILGESÜ, ŞENELTA A M, PAMUK V. Desulphurization of coals by flash pyrolysis followed by magnetic separation [J]. Fuel Processing Technology, 1996, 46(2): 133–142.

    Article  Google Scholar 

  9. SRINIVASAM N S, STAFFANSSON L I. A theoretical analysis of the fluidized-bed process for the reduction of iron ores [J]. Chemical Engineering Science, 1990, 45(15): 1253–1265.

    Article  Google Scholar 

  10. SRINIVASAM N S. Reduction of iron oxides by carbon in a circulating fluidized bed reactor [J]. Powder Technology, 2002, 124(1/2): 28–39.

    Article  Google Scholar 

  11. CAVANAGH P E. Autogenous roasting of iron ore [P]. US Patent 5244 494, 1993.

  12. YOUSSEF M A, MORSI M B. Reduction roast and magnetic separation of oxidized iron ores for production of blast furnace feed [J]. Canada Metallurgical Quarterly, 1998, 37(5): 419–428.

    Article  Google Scholar 

  13. LUO Li-qun, ZHANG Jing-sheng, YU Yong-fu. New technology and magnetic property of fast reducing roasting for fine iron bearing materials [C]// The 5th International Congress on the Science and Technology of Ironmaking (2009). Shanghai, China, 2009: 488–493.

  14. LIU Q F. Study on pro-concentration technique to Jingtieshan ore in Jiuquan iron and steel (group) Co. Ltd [D]. Xi’an: College of Metallurgical Engineering, Xi’an University of Architecture and Technology, 2003. (in Chinese)

  15. LUO Li-qun, ZHANG Jing-sheng, YU Yong-fu. Flash magnetic roasting and microstructure characteristics & phase transformation of iron minerals [J]. Journal of Central South University: Science and Technology, 2009, 40(5): 1172–1177. (in Chinese)

    Google Scholar 

  16. SUR S K. Measurement of magnetic susceptibility and magnetic moment of paramagnetic molecules in solution by high-field Fourier transform NMR spectroscopy [J]. Journal of Magnetic Resonance, 1989, 82(1): 169–173.

    Google Scholar 

  17. BERTINI I, LUCHINAT C, PARRIGI G. Magnetic susceptibility in paramagnetic NMR [J]. Progress in Nuclear Magnetic Resonance Spectroscopy, 2002, 40(3): 249–273.

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430070, China

    Li-qun Luo  (罗立群) & Yong-fu Yu  (余永富)

  2. School of Chemical Engineering, University of Queensland, Brisbane, QLD, 4072, Australia

    Li-qun Luo  (罗立群)

  3. Library of West Campus, Wuhan University of Technology, Wuhan, 430070, China

    Hong Huang  (黄红)

Authors
  1. Li-qun Luo  (罗立群)
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Hong Huang  (黄红)
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Yong-fu Yu  (余永富)
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Li-qun Luo  (罗立群).

Additional information

Foundation item: Project(20070497048) supported by China Scholarship Council, Ministry of Education of China

Rights and permissions

Reprints and permissions

About this article

Cite this article

Luo, Lq., Huang, H. & Yu, Yf. Characterization and technology of fast reducing roasting for fine iron materials. J. Cent. South Univ. 19, 2272–2278 (2012). https://doi.org/10.1007/s11771-012-1271-3

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s11771-012-1271-3

Key words

Search

Navigation