Resumen

YANG, F.; ZHANG, S.P.; TANG, T.  y  HU, Sh.Y.. Effects of oolitic haematite ore additions on the compressive strength of iron ore pellets. J. S. Afr. Inst. Min. Metall. [online]. 2018, vol.118, n.8, pp.879-882. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/2018/v118n8a11.

The effects of oolitic haematite ore additions on the compressive strength of iron ore pellets were investigated in a preliminary study. It was found that additions of oolitic haematite at levels of up to 15% by mass decreased the compressive strength from about 3250 N to 1729.1 N, which is below the minimum requirement of 2500 N for use in a blast furnace. As the oolitic haematite content increases, the Fe2O3 recrystallizes, forming frangible, unevenly distributed crystallites that are incompletely interlinked, thus reducing the compressive strength of the pellets. At the same time, as the oolitic haematite content is increased from zero to 15%, the porosity of the pellets increases from 13.11% to 19.85%, again resulting in a decrease in strength. It was found that the maximum amount of oolitic haematite should be 10% in order for the pellets to be suitable for blast furnace feed.

Palabras clave : iron ore; pelletization; oolitic haematite ore; compressive strength.

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