The Role of Basicity in the Formation of the Structure and Properties of Iron Ore Agglomerates

Abstract:

Metallurgical characteristics of iron ore agglomerates of various basicity (reducibility, strength after reduction (LTD_+6.3), temperatures of the beginning and ending of softening) have been investigated. The phase composition (XRD) of iron ore agglomerates and their microstructure were analyzed by optical microscopy. Various dependences of influence of the basicity of iron ore agglomerates on their metallurgical characteristics with respect to the proportion of phase components that have been obtained. It has been shown that an increase in the proportion of stabilized silicoferrite (SFCA) in the agglomerate has a positive effect on their strength after reaction, which will further increase the productivity of the blast furnace and significantly reduce dust emission.

• Periodical: Defect and Diffusion Forum (Volume 413)
• Pages: 201-208
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.413.201
• Online since: December 2021
• Authors: Andrey N. Dmitriev*, Elena A. Vyaznikova, Galina Yu. Vitkina, Roman V. Alektorov, Alexey B. Shubin
• Keywords: Agglomerates, Basicity, Blast Furnace Smelting, Characteristics, Phase Composition, Structure

References

[1] T.Ya. Malysheva, Influence of natural ore formation on mineral composition and cold strength of fluxed iron-ore agglomerates, Ferrous Metallurgy, 58,3 (2015), 180-185.

DOI: 10.17073/0368-0797-2015-3-180-185

[2] T. Honeyands, J. Manuel, L. Matthews, D. O'Dea, D. Pinson, J. Leedham, G. Zhang, H. Li, B. Monaghan, X. Liu, E. Donskoi, N.A.S. Webster, M.I. Pownceby, Comparison of the mineralogy of iron ore sinters using a range of techniques, Minerals, 9 (6) (2019), 333-349.

DOI: 10.3390/min9060333

[3] N.A.S. Webster, M.I. Pownceby, I.C. Madsen, A.J. Studer, J.R. Manuel, J.A. Kimpton, Fundamentals of silico-ferrite of calcium and aluminum (SFCA) and SFCA-I iron ore sinter bonding phase formation: effects of CaO:SiO2 ratio, Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, 45 (6) (2014), 2097-2105.

DOI: 10.1007/s11663-014-0137-5

[4] S. Nicol, J. Chen, M.I. Pownceby, N.A.S. Webster, A review of the chemistry, structure and formation conditions of silico-ferrite of calcium and aluminum (SFCA,) phases, ISIJ International, 58 (12) (2018), 2157-2172.

DOI: 10.2355/isijinternational.isijint-2018-203

[5] N.A.S. Webster, M.I. Pownceby, I.C. Madsen, J.A. Kimpton, Silico-ferrite of calcium and aluminum (SFCA) iron ore sinter bonding phases: new insights into their formation during heating and cooling, Metallurgical and Materials Transactions B, 43 (2012), 1344-1357.

DOI: 10.1007/s11663-012-9740-5

[6] J.D.G. Hamilton, B.F. Hoskins, W.G. Mumme, W.E. Borbidge, M.A. Montagie, The crystal structure and crystal chemistry of Ca2,3Mg0,8Al1,5Si1,1Fe8,3 O20 (SFCA): solid solution limits and selected phase relationships of SFCA in the SiO2 – Fe2O3 – CaO(– Al2O3) system, Neues Jahrb.Miner. Abh., 161 (1989), 1-26.

DOI: 10.1127/0077-7757/2003/0178-0307

[7] M. Sasaki, Yu. Hida, Consideration on the properties of sinter from the point of sintering reaction, 鉄 と 鋼 (Iron and Steel), 68 (1982), 563-571.

[8] A.N. Dmitriev, G.Yu. Vitkina, Yu.A. Chesnokov, Methodical basis of investigation of influence of the iron ore materials and coke metallurgical characteristics on the blast furnace smelting efficiency, Advanced Materials Research, 602-604 (2013), 365-375.

DOI: 10.4028/www.scientific.net/amr.602-604.365

[9] G.Yu. Vitkina, A.N. Dmitriev, R.V. Alektorov, E.A. Vyaznikova, Processing of agglomerates and pellets containing various amounts of titanium dioxide, Materials Science Forum, 1026 (2021), 102-108.

DOI: 10.4028/www.scientific.net/msf.1026.102

[10] A.N. Dmitriev, G.Yu. Vitkina, R.V. Alektorov, E.A. Vyaznikova, Physical-chemical and pyrometallurgical estimation of processing of complex ores with extraction of iron, vanadium, titanium, Defect and Diffusion Forum, 407 (2021), 41-50.

DOI: 10.4028/www.scientific.net/ddf.407.41

[11] G.Yu. Vitkina, A.N. Dmitriev, R.V. Alektorov, Study of the main metallurgical characteristics of iron ore raw materials (sinter and pellets), IOP Conference Series: Materials Science and Engineering, 966 (2020), 347-362.

DOI: 10.1088/1757-899x/966/1/012061

[12] M. Zhang, M.S. Coe, M.W. Andrade, Effect of sinter basicity on sinter productivity and quality with high rate of recycled materials, Drying, Roasting, and Calcining of Minerals, Springer, Cham, 2015, 259-267.

DOI: 10.1007/978-3-319-48245-3_32