The crystallisation behaviour of Fe 2 O 3 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 Fe 2 O 3 particles during preheating. This occurs because the activity of Fe 2 O 3 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 1250uC, the strength is mainly provided by the development, connection and growth of Fe 2 O 3 crystalline grains from SH. Only if the temperature exceeds 1280uC does Fe 2 O 3 recrystallisation in OH grains develop well with the iron ore particles in the pellets fully connected, so increasing pellet strength.
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