Induration mechanisms of oxidised pellets prepared from mixed magnetite

Abstract

The crystallisation behaviour of Fe₂O₃ during preheating and roasting of pellets made from mixed magnetite–haematite (M–H) concentrates has been studied. The results indicate that the strength of pellets is mainly provided by the crystalline connections between Fe₂O₃ particles during preheating. This occurs because the activity of Fe₂O₃ from secondary haematite (SH) (oxidised from magnetite concentrate, SH) is higher than from original haematite (OH). In the roasting process, when temperature is lower than 1250°C, the strength is mainly provided by the development, connection and growth of Fe₂O₃ crystalline grains from SH. Only if the temperature exceeds 1280°C does Fe₂O₃ recrystallisation in OH grains develop well with the iron ore particles in the pellets fully connected, so increasing pellet strength.

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Induration mechanisms of oxidised pellets prepared from mixed magnetite–haematite concentrates

Abstract

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References