Influence of MgO Additive on Fluidized Bed Reduction of Iron Ore Fines under Simulate COREX Reducing Gas

Abstract:

Influence of mixing MgO additive on fluidized bed reduction of iron ore fines using simulate COREX reducing gas was investigated. Experiments were conducted at 1073 K in a visualization fluidized bed. Mixing MgO additive was carried out using powder method and solution method. It was found that mixing MgO into ore fines using solution method could increase fluidization time from 12 to 80 minutes, and improve the metallization ratio from 22% to 81%. Reason was that coating MgO could effectively insulate the contact of metallic iron on particles, which provided the reaction time for carbon deposition and the production of Fe3C with low stickiness. Therefore, the decrease of metallic iron on particle surface led to the decrease of particle stickiness in fluidized bed reduction

• Periodical: Advanced Materials Research (Volume 567)
• Pages: 96-101
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.567.96
• Online since: September 2012
• Authors: Jian Hua Shao, Hui Qing Tang, Zhan Cheng Guo
• Keywords: Defluidization, Fluidized Bed Reduction, Iron Ore Fines, Magnesium Oxide Additive, Sticking

References

[1] J. H. Shao: Energy for Metallurgical Industry, Vol. 29 (2010), pp.18-22.

[2] H. W. Gudenau, J. Fang and T. Hirata: Steel Research, Vol. 60 (1989), pp.138-144.

[3] J. Fang, S. J. Hao and Z. G. Li: Alternative processes for iron production (Metallurgy Industry Press, Beijing 2003).

[4] M. S. Guo, H. Z. Li and Y. C. Li: Handbook of fluidization (Chemical industry press, Beijing 2008).

[5] S. Hayashi, S. Sayama and Y. Iguchi: ISIJ Int., Vol. 30 (1990), pp.722-730.

[6] R. Nicolle and A. Rist: METALLURGICAL TRANSACTIONS B, Vol. 10B (1978), pp.429-438.

[7] S. Hayashi and Y. Iguchi: ISIJ Int., Vol. 29 (1989), pp.596-604.

[8] S. Hayashi, S. Sawai and Y. Iguchi: ISIJ Int., Vol. 33 (1993), pp.1078-1087.

[9] J. H. Shao, Z. C. Guo and H. Q. TANG: ISIJ Int., Vol. 51 (2011), pp.1290-1295.

[10] E. T. Turkdogan and J. V. Vinters: METALLURGICAL TRANSACTIONS, Vol. 5 (1974), pp.11-19.