Oxidising roasting behaviours of anthracite containing haematite pellets

Abstract

In this investigation, the roasting features of haematite pellets to which a small amount of anthracite was added and the effects of carbon on the induration behaviours of the pellets were studied. The results indicate that the suitable dosage of pulverised anthracite is 1·0–1·5%. During the roasting, part of the original haematite grains in the pellets are reduced to magnetite, and some original haematite grains are decomposed into magnetite. Then, the newborn magnetite is oxidised to secondary haematite, which is beneficial to the recrystallisation of Fe₂O₃ in the fired pellets. Therefore, adding a certain proportion of anthracite is an effective way to improve the roasting strength of haematite pellets, as well as to reduce the roasting temperature and the total energy consumption of the pellet production.