Study of Temperature Profile in the Induration of Magnetite Iron Ore Pellets
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The pelletisation study of magnetite iron ore fines starts with green balling using limestone and bentonite as additives. Heating cycle of iron ore pellets is one of the prime segments of the whole pelletisation process. Drying, pre-heating, firing and cooling processes are collectively named as heating cycle of the process. A temperature profile is maintained throughout the induration process to meet the required specification of the pellet quality. This paper emphasizes on the effect of temperature profile on the mineralogical, physical and chemical properties of fired pellet in the heating cycle. This study includes the green balling and heating cycle at different temperatures from 800 to 1250 °C in batch processes of magnetite iron ore fines. The mineralogical phase conversion mainly from magnetite to hematite at different temperatures is evaluated by XRD study. The microstructural characterisation, compressive strength and chemical analysis of the indurated pellets are used to analyse the effect of increasing temperature during pellet induration.
KeywordsGreen ball kinetics Heating cycle Temperature profile Cold compressive strength (CCS) Pellet morphology
The authors are thankful to Prof. B.K. Mishra, Director of CSIR-Institute of Minerals and Materials Technology, Bhubaneswar for giving permission to publish this paper.
- 1.Mayer K, Pelletizing of Iron Ores, Springer, Berlin (1980).Google Scholar
- 4.Mohindra M, Prusti P, Sahu S N, Beuria P C, Sahu A K, and Biswal S K, in International Symposium on MRMMPI, Bhubaneswar (2013), p 143.Google Scholar
- 7.Kumar T K S, Investigation of Sintering Kinetics of Magnetite pellets during Induration, Ph D Thesis, Luleå University of Technology, (2015).Google Scholar
- 10.Forsmo S, Influence of Green Pellet Properties on Pelletizing of Magnetite Iron Ore, Doctoral Thesis, Luleå University of Technology Department of Chemical Engineering and Geosciences, Division of Process Metallurgy (2007).Google Scholar
- 14.Kapur P C, and Fuerstenau D W, Trans AIME 229 (1964) 348.Google Scholar
- 18.Gupta R C, Theory and Laboratory Experiments in Ferrous Metallurgy, PHI Learning Private Limited (2010).Google Scholar
- 21.Umadevi T, Kumar P, Lobo N F, Mahapatra P C, Prabhu M, and Ranjan M, Steel Res Int 80 (2009) 709.Google Scholar