High-rate behaviour of iron ore pellet

Gustaf Gustafsson,Masahiro Nishida,Pär Jonsén,Hans-Åke Häggblad,E Cadoni

doi:10.1051/epjconf/20159405003

Gustaf Gustafsson, Masahiro Nishida + Show 3 more

Open Access

https://doi.org/10.1051/epjconf/20159405003

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Abstract

Iron ore pellets are sintered, centimetre-sized spheres of ore with high iron content. Together with carbonized coal, iron ore pellets are used in the production of steel. In the transportation from the pelletizing plants to the customers, the iron ore pellets are exposed to different loading situations, resulting in degradation of strength and in some cases fragmentation. For future reliable numerical simulations of the handling and transportation of iron ore pellets, knowledge about their mechanical properties is needed. This paper describes the experimental work to investigate the dynamic mechanical properties of blast furnace iron ore pellets. To study the dynamic fracture of iron ore pellets a number of split Hopkinson pressure bar tests are carried out and analysed.

Highlights

Handling of iron ore pellets is an important part in the production chain for many producers of iron ore pellets
The pellets are exposed to different loadings, resulting in degradation of their strength and generation of fines
The results show that the stress state in an irregular test piece subjected to concentrated loads may be, in the vicinity of the axis of loading, much the same as that in a perfectly spherical test piece compressed diametrically

Summary

Introduction

Handling of iron ore pellets is an important part in the production chain for many producers of iron ore pellets. After production in the pelletizing plants, the iron ore pellets pass through a number of transportation and handling systems like conveyor belts, silo filling, silo discharging and transport by rail and ship. To study and optimize processes of transportation and handling of bulk material, traditionally half- or full-scale experiments have been used [1, 2] The focus of these studies is often the pressures on the surrounding structures and not the stresses in the bulk material. For iron ore pellets flow particle based methods like the smoothed particle hydrodynamics (SPH) method [6] can be used Such models give the flow, stresses and strains on a continuum length scale but not the stress state inside the individual granules. Such models are available for some granular materials in 2D, see for example [7] and for static loading of pellets, see [8]

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