Tecnologia em Metalurgia, Materiais e Mineração
https://tecnologiammm.com.br/article/doi/10.4322/2176-1523.20181524
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

INFLUENCE OF CARBON CONTENT ON MECHANICAL PROPERTIES OF IRON ORE PELLETS

Priscilla Messias Pereira, Maurício Covcevich Bagatini

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Abstract

Solid fuels are added during the pelletizing process in order to reduce the natural gas consumption in the firing process and to obtain better temperature distribution inside the pellets for its induration. The purpose of this research was to evaluate the effect of the amount of carbon added to mixtures containing different types of pellet feed on the mechanical strength. The pellet mixtures were prepared with different dosages of anthracite (1, 1.2 and 1.4% of fixed carbon) and two different sorts of pellet feed. The mixing, pelletizing and firing stages were done on a pilot scale, and the fired pellets were subjected to the mechanical properties evaluation and microstructural analyses. It was found that when increasing the amount of anthracite, the compression and tumbler strength of the fired pellets decreased, which seemed to be related to the formation of a large number of pores and magnetite in the core of the pellets. When a larger amount of porous hematite and goethite were used in the pellet feed, larger quantities of magnetite were found in the microstructure of the pellets.

Keywords

Iron ore; Pelletizing; Anthracite; Mechanical strength.

Referências

1 Meyer K. Pelletizing of iron ores. Düsseldorf: Springer – Verlag Berlin, Heidelberg and Verlag Stahleissen mbH; 1980.

2 Dwarapudi S, Umadevi T, Mohan-Rao S, Ranjan M. Influence of pellet size on quality and microstructure of iron ore pellets. ISIJ International. 2008;6:768-776.

3 Umadevi T, Lobo NF, Desai S, Mahapatra PC, Sah R, Prabu M. Optimization of firing temperature for hematite pellets. ISIJ International. 2013;9:1673-1682.

4 Carvalho MO, Cardoso M, Vakkilianen EK. Biomass gasification for natural gas substitution in iron ore pelletizing plants. Renewable Energy. 2015;81:566-577.

5 Suopajärvi H, Fabritius T. Effects of biomass use in integrated steel plant – gate-to-gate life cycle inventory method. ISIJ International. 2012;52:779-787.

6 Pownceby MI, Clout JMF. Importance of fine ore chemical composition and high temperature phase relations: applications to iron ore sintering and pelletising. Mineral Processing and Extractive Metallurgy. 2003;112(1):44-51.

7 Pal J, Ghorai S, Rajshekar Y, Koranne VM. Development of blast furnace quality pellet optimising blue dust, hard ore and friable ore ratio. Ironmaking & Steelmaking. 2016;44(8):568-576.

8 Strezov V, Evans TJ, Zymla V, Strezov L. Structural deterioration of iron ore particles during thermal processing. International Journal of Mineral Processing. 2011;100:27-32.

9 Li GH, Li XQ, Zhang YB, He GQ, Jiang T. Induration mechanisms of oxidised pellets prepared from mixed magnetite-haematite concentrates. Ironmaking & Steelmaking. 2009;36(5):393-396.

10 Powncebt MI, Webster NAS, Manuel JR, Ware N. The influence of ore composition on sinter phase mineralogy and strength. Mineral Processing and Extractive Metallurgy. 2016;125(3):140-148.

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