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Journal of the Southern African Institute of Mining and Metallurgy

On-line version ISSN 2411-9717
Print version ISSN 0038-223X

J. S. Afr. Inst. Min. Metall. vol.108 n.5 Johannesburg May. 2008




Control of the grain size distribution of the raw material mixture in the production of iron sinter



E. Lwamba; A.M. Garbers-Craig

Department of Materials Science and Metallurgical Engineering, University of Pretoria, Pretoria




The aim of this study was to examine the effect of grain size distribution control of the raw material mixture on the permeability of the green sinter bed and the properties of the produced sinter. This was achieved by evaluating the granulation characteristics of the sinter mixture (moisture content, ranulation time and mean granule diameter) in terms of its green bed permeability, and evaluating the productivity of the sinter bed, the coke rate, tumble index (TI), abrasion index (AI), reduction disintegration index (RDI) and reducibility (RI) of the produced sinter. The raw sinter mixtures contained combinations of Thabazimbi iron ore, Sishen iron ore, coke, lime and return fines. The grain size distributions were controlled by removing the -0.5 mm size fractions of the return fines and coke, and the -1 mm size fraction of lime. Of the examined mixtures, a mixture of 20 mass% Thabazimbi iron ore, 80 mass% Sishen iron ore and fluxes where the coke, lime and return fines were all sized had the highest granulation effectiveness and permeability. The sintering properties of the mixtures in which the grain size distributions were controlled, were very similar for all the mixtures, but superior to the base case mixture in which the grain size distribution was not controlled.

Keywords: Thabazimbi iron ore; Sishen iron ore; granulation, permeability, grain size distribution; sinter



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1. BISWAS, A.K. Principles of Blast Furnace Ironmaking, University of Queensland, Brisbane, Australia, 1981. p. 194.         [ Links ]

2. VENKATARAMANA, R., GUPTA, S.S., and KAPUR, P.C. A combined model for granule size distribution and cold bed permeability in the wet stage of iron ore sintering process. Int. J. Miner. Process., vol. 57, 1999, pp. 43-58.         [ Links ]

3. RANKIN, W.J. and ROLLER, P.W. The measurement of void fraction in beds of granulated iron ore sinter feed. Trans. ISIJ, vol. 25, 1985, pp. 1016-1020.         [ Links ]

4. TEO, C.S., MIKKA, R.A., and LOO, C.E. Positioning coke particles in iron ore sintering, ISIJ Int., vol. 32, no. 10, 1992, pp. 1047-1057.         [ Links ]

5. LITSTER, J.D. and WATERS, A.D. Kinetics of iron ore sinter feed granulation, Powder Technology, vol. 62, 1990, pp. 125-134.         [ Links ]

6. BERGSTRAND, R., KHOSA, J., WATERS, A., and GARDEN, J. The effect of Marra Mamba ore addition on the granulation characteristics of pisolite based and hematite based sinter blends, ISIJ Int., vol. 45, no. 4, 2005, pp. 492-499.         [ Links ]

7. KHOSA, J. and MANUEL, J. Predicting granulating behaviour of iron ores based on size distribution and composition, ISIJ Int., vol. 47, no. 7, 2007, pp. 965-972.         [ Links ]

8. FORMOSO, A., MORO, A., PELLO, G.F., MENENDEZ, J.L., MUNIZ, M., and CORES, A. Influence of nature and particle size distribution on granulation of iron ore mixtures used in a sinter strand, Ironmaking and Steelmaking, vol. 30, no. 6, 2003, pp. 447-460.         [ Links ]

9. LITSTER, J.D. and WATERS, A.G. Influence of the material properties of iron ore sinter feed on granulation effectiveness. Powder Technology, vol. 55, 1988, pp. 141-151. 15        [ Links ]

10. LOO, C.E. and PENNY, G.C. Granulation behaviour of iron ore blends containing coarse, porous ore, Transactions of the Institution of Mining and Metallurgy, Section C (UK), vol. 107, Sept.-Dec. 1998, pp. C111-C122.         [ Links ]

11. ELLIS, B.G., LOO, C.E., and WITCHARD, D. Effect of ore properties on sinter bed permeability and strength, Ironmaking & Steelmaking, vol. 34, no. 2, 2007, pp. 99-108.         [ Links ]

12. XU, J.Q., ZOU, R.P., and YU, A.B. Quantification of the mechanisms governing the packing of iron ore fines, Powder Technology, vol. 169, 2006, pp. 99-107.         [ Links ]

13. MAEDA, T., FUKUMOTO, C., MATSUMURA, T., NISHIOKA, K., and SHIMIZU, M. Effect of adding moisture and wettability on granulation of iron ore, ISIJ Int., vol. 45, no. 4, 2005, pp. 477-484.         [ Links ]

14. LITSTER, J.D. and WATERS, A.D. Influence of the material properties of iron ore sinter feed on granulation effectiveness, Powder Technology, vol. 55, 1988, pp. 141-151.         [ Links ]

15. BHAGAT, R.P., CHATTORAJ, U.S., GOSWAMI, M.C., SINGH, D.P., and SIL, S.K. Effect of size parameters of mix ingredients on the porosity and reduction characteristics of sinter, Steel Research Int., vol. 78, no. 6, 2007, pp. 451-454.         [ Links ]

16. HOSOTANI, Y., KONNO, N., YAMAGUCHI, K., ORIMOTO, T., and INAZUMI, T. Reduction properties of sinter with fine dispersed pores at high temperatures of 1273K and above, ISIJ Int., vol. 36, no. 12, 1996, pp. 1439-1447.         [ Links ]

17. KASAI, E., RANKIN, W.J., and GANNON, J.F. The effect of raw mixture properties on bed permeability during sintering, ISIJ Int., vol. 29, no. 1, 1989, pp. 33-42.         [ Links ]

18. OTOMO, T., TAKASAKI, Y., and KAWAGUCHI, T. Properties of core ore in quasiparticle required for large amounts usage of limonitic ores in iron ore sintering process, ISIJ Int., vol. 45, no. 4, 2005, pp. 532-537.         [ Links ]

19. KAMIJO, C., MATSUMURA, M., and KAWAGUCHI, T. Sintering behaviour of raw material bed placing large particles, ISIJ Int., vol. 45, no. 4, 2005, pp. 544-550.         [ Links ]

20. OYAMA, N., SATO, H., TAKEDA, K., ARIYAMA, T., MASUMOTO, S., JINNO, T., and FUJII, N. Development of coating granulation process at commercial sintering plant for improving productivity and reducibility, ISIJ Int., vol. 45, no. 6, 2005, pp. 817-826.         [ Links ]

21. VENKATARAMANA, R., KAPUR, P.C., and GUPTA, S.S. Modelling of granulation by a twostage auto-layering mechanism in continuous industrial drums, Chem. Eng. Science, vol. 57, 2002, pp. 1685-1693.         [ Links ]

22. HSIEH, L.-H. Effect of raw material composition on the sintering properties. ISIJ Int., vol. 45, no. 4, 2005, pp. 551-559.         [ Links ]

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