Abstract
At present various naturally available minerals containing MgO viz. olivine, pyroxenite, dunite, dolomite etc. are widely used in different plants to reduce RDI of iron ore pellets and improve other properties. However, properties of each of the above fluxes are physically and chemically different and they contain different types and quantities of gangue materials, such as silica, alumina (Al2O3), CaO etc. Although, MgO has some specific roles, other gangue materials carried by MgO bearing fluxes also have a significant effect on phase formation or slag bonding in pellet and pellet properties. Thus, different MgO bearing fluxes show different behavior in pellets. It is very imperative to study the actual role of MgO and the effect of different gangue materials in it. This study has examined the actual role of MgO and its optimum requirement as well as the effect of other gangue materials in MgO bearing fluxes. For this purpose, pure MgO, olivine and waste magnesite brick powder have been used separately in pellet making with a high Al2O3 hematite ore and their characteristics have been compared. It has been found that 0.9 % pure MgO in pellet can reduce the reduction degradation index to as low as 7.5 %, but it shows a little deterioration in strength property. Other two fluxes provide good strength properties at lower induration temperature but, cannot reduce degradation index to sufficiently low level. Olivine has shown better performance than magnesite because of its different gangue content.
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Higuchi K, Tanaka T, and Sato T, ISIJ Int 47 (2007) 669.
Dwarapudi S, Ghosh T K, Shankar A, Tathavadkar, V, Bhattacharjee D, and Venugopal R, Int J Miner Process 96 (2010) 45.
Dwarapudi S, Ghosh T K, Kumar T K, Tathavadkar V, Bhattacharjee D, and Venugopal R, Steel Tech 6 (2011) 27.
Pal J, Ghorai S, Agarwal S, Nandi B, Chakraborty T, Das, G, and Prakash S, Miner Process Extr Metall Rev 36 (2015) 83.
Qiang-Jian G, Feng-Man S, Guo W, Xin J, and Hai-Yan Z, J Iron Steel Res Int 20 (2013) 25.
Dwarapudi S, Ghosh T K, Tathavadkar V, Bhattacharjee D, Venugopal R, and Denys Mark B, Int J Miner Process 112–113 (2012) 55.
Sugiyama T, Shirouchi S, Tsuchiya O, Onoda M, and Fujita I, Trans ISIJ 23 (1983) 146.
Sugiyama T, Shirouchi S, Tsuchiya O, Onoda M, and Fujita I, Trans ISIJ 23 (1983) 153.
Zhu D, Chun T, Pan J, and Zhang J, Int J Miner Process 125 (2013) 51.
Friel J J, and Erickson E S Jr, Metall Trans B 11B (1980) 233.
Panigraphy S C, Jena B C, and Rigaud M, Metall Trans B 21B (1990) 463.
Narita K, Maekawa M, and Shigaki I, Trans ISIJ 18 (1977) 712.
Semberg P, Andersson C, and Bjorkman B, ISIJ Int 53 (2013) 391.
Lingtan K, and Yang L, Scand J Metall 4 (1983) 166.
Eisele T C, and Kawatra S K, Miner Process Extr Metall Rev 24 (2003)1.
Von Bogdandy L, and Enngell H J, The Reduction of Iron Ore, 1 st ed, Springer, New York (1971), p 34.
Lu L, Holmes R J, and Manuel J R, ISIJ Int 47 (2007) 349.
Pimenta H P, and Seshadri V, Ironmak Steelmak 29 (2002) 175.
Inglethorpe S D, Morgan D J, Highley D E, and Bloodworth A J, Industrial Mineral Laboratory Manual on ‘BENTONITE’, British Geological Survey, Keyworth, (1993), p 5. http://www.bgs.ac.uk/research/international/dfid-kar/WG93020_col.pdf. Accessed on 05.05.2014.
Umadevi T, Kumar P, Naveen F L, Prabhu M, Mahapatra P C, and Ranjan M, ISIJ Int 51 (2011) 14.
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Authors thankfully express their sincere gratitude to the Director, CSIR-National Metallurgical Laboratory to accord permission in publishing the paper.
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Meraj, M., Pramanik, S. & Pal, J. Role of MgO and Its Different Minerals on Properties of Iron Ore Pellet. Trans Indian Inst Met 69, 1141–1153 (2016). https://doi.org/10.1007/s12666-015-0676-8
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DOI: https://doi.org/10.1007/s12666-015-0676-8