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Oxidized pellets, consisting of Brazilian specularite fines and coke fines, were prepared by disc pelletizer using bentonite as binder. The roasting process of pellets includes preheating stage and firing stage. The compressive strength of preheated pellets and fired pellets reached the peak value at 1.5% coke fines dosage. During the initial stage of preheating, some original Fe 2 O 3  was reduced to Fe 3 O 4  because of partial reduction atmosphere in pellet. During the later stage of preheating and firing stage, coke fines were burnt out, and the secondary Fe 2 O 3  (new generation Fe 2 O 3 ) was generated due to the re-oxidization of Fe 3 O 4 , which improved the recrystallization of Fe 2 O 3 . Compared with the fired pellets without adding coke fines, fired pellets with 1.5% coke fines exhibited the comparable RSI (reduction swelling index) and RDI +3.15 mm  (reduction degradation index), and slightly lower RI (reducibility index).

Oxidizing Roasting Performances of Coke Fines Bearing Brazilian Specularite Pellets