Granulation behaviour of specularite fines in ferrous sinter mixtures

Abstract

The granulation behaviour of specularite fines which possess poor ballability was studied with limonite fines as a function of nuclei particles and adhering fines. The results show that the permeability of granules deteriorated as the ratio of specularite fines increased in the mixture, and the optimal granulation moisture content also decreased. The granulation kinetics results demonstrate that the adhering load of specularite fines increased rapidly within 3 minutes and then levelled off. With increasing specularite fines ratio, the adhering rate accelerated but the granulation duration needed to be longer to reach adhering balance. The microstructure of granule quasi-particles indicates that the fine limonite particles act as binders to bond together the specularite particles which are dispersed in the adhering layers. This can improve the adhering strength of the granules. Hence, the granulation behaviour of specularite fines can be improved by blending them with fine limonite ores which have high adhering capabilities.

Keywords

Specularite fines Limonite fines Granulation behaviour Sinter mixture

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References

Chen,

, Gao,

B. Y.

, Yang,

Y. B.

and Ma,

Y. G.

2012. Experimental study on sintering properties of specularite. Henan Metallurgy, 20(3), pp. 6–8.

Coasta,

, Coheur,

and Vanderheyden,

1995. Slag formation in the adhering layer of granules and its reaction with nuclei in iron sintering. ISIJ International, 35(2), pp. 138–47. doi: 10.2355/isijinternational.35.138

Fan,

X. H.

2013. Principle and technology of iron ore matching for sintering. Beijing: Metallurgical Industry Press, pp. 15.

Fu,

J. Y.

, Jiang,

and Zhu,

D. Q.

1996. Sintering and pelletizing. Changsha: Central South University of Technology Press, pp. 102–6.

Fu,

J. Y.

and Zhu,

D. Q.

2004. Iron oxide pellets basic principles, processes and equipment. Changsha: Central South University of Technology Press, pp. 127–9.

Huang,

X. B.

, Lv,

X. W.

, Bai,

C. G.

, Qiu,

G. B.

and Lu,

L. M.

2014. Effect of pre-wetting treatment on the granulation behavior of iron ore fines. ISIJ International, 54(12), pp. 2721–7. doi: 10.2355/isijinternational.54.2721

Iveson,

S. M.

and Litster,

J. D.

1998. Fundamental studies of granule consolidation Part 2: Quantifying the effects of particle and binder properties. Powder Technology, 99(3), pp. 243–50.

Iveson,

, Lister,

and Hapgood,

2001. Nucleation, growth and breakage phenomena in agitated wet granulation processes: a review. Powder Technology, 117(1–2), pp. 3–39. doi: 10.1016/S0032-5910(01)00313-8

Kapur,

P. C.

and Runkana,

2003. Balling and granulation kinetics revisited. International Journal of Mineral Processing, 72(1–4), pp. 417–27. doi: 10.1016/S0301-7516(03)00116-9

10.

Linkson,

, Glastonbury,

and Duffy,

1973. The mechanism of granule growth in wet pelletisation. Transactions of Institute of Chemical Engineering, 51(4), pp. 251–270.

11.

Litster,

J. D.

, Waters,

A. G.

1988. Influence of the material properties of iron ore sinter feed on granulation effectiveness. Powder Technology, 55(2), pp. 141–151. doi: 10.1016/0032-5910(88)80097-4

12.

Newitt,

D. M.

and Conway-Jones,

J. M.

1958. A contribution to the theory and practice of granulation. Transactions of Institute of Chemical Engineering, 36, pp. 422–42.

13.

Qiu,

G. Z.

, Jiang,

and Xu,

J. C.

2001. Direct reduction of cold-bonded pellets. Changsha: Central South University Press, pp. 100–104.

14.

Venkataramana,

, Kapur,

P. C.

and Gupta,

S. S.

2002. Modelling of granulation by a two-stage auto-layering mechanism in continuous industrial drums. Chemical Engineering Science, 57(10), pp. 1685–93. doi: 10.1016/S0009-2509(02)00070-2

15.

Wang,

S. P.

, Bi,

X. G.

and Li,

2008. Study on sintering properties of Canadian iron concentrates. Research on Iron & Steel, 36(6), pp. 1–4.

16.

Yamaguchi,

, Kamijo,

, Matsumura,

and Kawaguchi,

2013. Improvement of permeability of sintering bed by adding dry particles to granulated raw materials. ISIJ International, 53(9), pp. 1538–44. doi: 10.2355/isijinternational.53.1538

17.

Zhu,

D. Q.

, Wang,

Z. Y.

, Pan,

, Li,

and Xu,

X. F.

2006. Sintering behaviors of Brazilian hematite concentrate and its improvements. Journal of Central South University, 37(5), pp. 878–83.

18.

Zhao,

D. Y.

2013. The smelting feasibility test and application of the Canada fine ore. Henan Metallurgy, 21(5), pp. 5–8.