Characterization of Fluxed Iron Ore Pellets as Compared to Feed Material for Blast Furnace

Arup Kumar Mandal

Abstract


The effect of lime addition in hematite iron ore pelletson its physico-chemical as well as mechanical properties with respect to blast furnace requirement was studied in a laboratory scale with varying basicity i.e. 0-2.0.Increasing addition lime produced more calcium-alumino-silicate phases (slag)asevidenced by SEM-EDAX analysis. These phases have low melting points which enhances sticking behaviourof pellets, as well as imparting strength to the pellets(resulting increasingcompressive strength,tumbler, abrasionand shatter index)anddecreasing the porosity.The low basicity pellets were predominantly oxide-bonded, while high basicity pellets were mostly slag bonded. This means that pellets should be fired at sufficiently high enough temperature to generate liquid phases to get the sufficient strength but not so high as to cause pellets to stick. The properties of fluxed pellets were compared with the properties of iron ore lump and pellets, which are being used in blast furnace for production of iron and steel.



Keywords


Calcium Aluminium silicate, Lime Fluxed pellets, Characterization, Strengthening behavior, Shatter and tumbler test

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References


ASTM Standard C20-00, 2010,Standard test methods for apparent porosity, water absorption, apparent specific gravity, and bulk density of burned refractory brick and shapes by boiling water, ASTM International, West Conshohocken, PA, doi: 10.1520/C0020-00R10, www.astm.org

ASTM Standard C135 - 96(2009), Standard test method for true speci?c gravity of refractory materials by water immersion, ASTM International, West Conshohocken, PA, doi: 10.1520/C0135-96R09E01, www. astm.org

Chizhikov V.M, Vainshtein R.M, Zorin S.N, Zainetdinov T.I, Zinyagin G.A, Shevchenko A.A., 2003, Production of iron ore-pellets with an organic binder, Metallurgist ,47, pp. 3-4

de Souza R.P, de Mendonca C.F, Kater T., 1984, Production of acid iron ore pellet for direct reduction using an organic binder. Mining Eng. Magn., 36, pp.1437-1441

Dwarapudi S, Ghosh T K, Shankar A, Tathavadkar V, Bhattacharjee D, Venugopal R., 2010,Effect of pyroxenite flux on the quality and microstructure of hematite pellets International Journal of Mineral Processing, 96, pp.45-53

Dwarapudi S, Ghosh T K, Shankar A, Tathavadkar V, Bhattacharjee D, Venugopal R., 2011, Effect of pellet basicity and MgO content on the quality and microstructure of hematite pellets. International Journal of Mineral Processing, 99, pp. 4353

Eisele T.C., Kawatra, S.K.,2003, A review of binders in iron ore pelletization, Miner. Process. Extr. Metall. Rev, 24 , pp. 190; DOI:10.1080/08827500306896

Firth A.R., Garden J.F. , Douglas J.D., 2008,Phase Equilibria and Slag Formation in the Magnetite Core of Fluxed Iron Ore Pellets ISIJ International, 48 , pp. 1485-1492

Forsmo S.P.E.. Apelqvist A.J , Bjrkman B.M.T., Samskog P.O., 2006, Binding mechanisms in wet iron ore green pellets with a bentonite binder, Powder Technology, 169 , pp.147 158; doi:10.1016/j.powtec.2006.08.008

Frazer F.W, Westenberger H, Boss K.H, Thumm W., 1975,The relationship between basicity and swelling on reduction of iron-ore pellets, International Journal of Mineral Processing, 2 ,pp. 353-365

Friel J.J., Erickson E. S., 1980, Chemistry, microstructure, and reduction characteristics of dolomite-fluxed magnetite pellets, Metallurgical Transactions B, 11, pp 233-243

Gupta R.C., 2010, Theory and Laboratory Experiments in Ferrous Metallurgy, PHI Learning Pvt. Ltd, New Delhi, pp.64-84

Heerema R.H., Kortmann H., Kater T., ven den Boogaard V.C., 1989, Improvements of acid, olivine and dolomite fluxed iron ore pellets using an organic binder. In:5th International Symposium on Agglomeration, Brighton, 227-239.

IBM 2012, Iron and Steel Vision 2020 Chapter 4; Agglomaration ( http://ibm.gov.in/ch4.pdf)

Mandal A.K, Sarkar, A, Sinha, O.P., 2012, Conversion of solid waste fines of comminution process into feeding material of Blast Furnace grade iron ore pellets, SGAT Bulletin,139, pp. 95-113.

Onoda M., Tsuchiya O., Sugiyama T., Fujita I., 1980, Quality improvements of lime fluxed pellets, In: Proc of ISS-AIME 40th Iron making conference, Toronto, Ontario CANADA, pp. 286-298

Pal J, Ghorai S, Goswami M.C, Ghosh S, Ghosh D, Bandyopadhyay D., 2009, Development of fluxed iron oxide pellets strengthened by CO2 treatment for use in Basic Oxygen Steel Making. ISIJ International, 49, pp.210-219

Panigraphy S.C, Verstraeten P, Dilewijns J., 1984, Influence of MgO addition on the mineralogy of iron ore sinter,Metall. Trans. B, 15, pp. 23-32

Panigraphy S.C., Jena B.C., Rigaud M., 1990,Characterization of bonding and crystalline phases in fluxed pellets using peat moss and bentonite as binders Metall. Trans. B, 21, pp. 463-474

Sarkar A, Mandal A.K, Sinha O.P., 2013, Pelletisation Behavior of Fluxed Iron Ore Pellets of Varying Basicities Made with Waste Fines, International Journal of Science and Engineering, 5,pp. 9-14

Schmitt J., 2005,A method for improving the process and quality of iron ore pellets made with organic binders. In: 66th Annual University of Minnesota Mining Symposium, Duluth, MN, USA. pp. 1920

Sinha K. M. K., Sharma T., 2014, Reduction of iron ore pellets by statistical design of experiments, Int. J. Engg. Res. & Sci. & Tech., 3, pp. 1-6, http://www.ijerst.com/currentiss ue.php

Specht M., Seaton C., Morales A., 1992, Self reduced iron ore pellets using Plexicoke as reductant. In: Symposium on chemistry, structure and reactivity of coals, tar sands and oil shale. (San Francisco), 37(2):pp 608-618

Takashi A., Kiyoshi F., Hidekazu F., 2009,Development of carbon iron composite process, JFE Technical Report, 13,pp.20-24 (www.jfe-steel.co.jp/en/research/report/013/pdf/013-02.pdf)

Tupkary, R. H., Tupkary, V. R., 2003, An Introduction to Modern Ironmaking, Khanna Publishers ,New Delhi, ISBN : 8174090215

Umadevi T, Kumar P, Lobo N F, Prabhu M, Mahapatra P.C, Ranjan M., 2011,Influence of Pellet Basicity (CaO/SiO2) on Iron Ore Pellet Properties and Microstructure. ISIJ International, 51, pp. 14-20

United Nations Conference on Trade and Development (UNCTAD), 2010, The Iron Ore Market 2009?2011, Geneva, Switzerland, (http://www.unctad.org/infocomm/Iron/Flyer_ 2010_English.PDF).

United States Geological Survey (USGS), 2013,Iron Ore Statistics and Information, Reston, VA, (http://minerals.usgs.gov/ minerals/pubs/commodity/iron_ore/2012)


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