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As the main iron ore importing country for China, the abundant mineral resources of Australian are the primary raw materials for the sintering production. To better understand the properties of different iron ore from Australia and then guide the sintering production, this study selected four types ore from Australian and one type ore from domestic, and their properties were investigated under different condition. The experiment of single iron ore sintering was studied to examine the influence of different iron ore on metallurgical properties of sinter. From this study, the following results were obtained: GG showed poor fluidity and higher assimilability temperature, but the bonding phase strength was the highest; YD showed better fluidity and lower assimilability temperature, whereas SJY (domestic ore) showed better fluidity and higher bonding phase strength, lower assimilability temperature. The influence mechanism of iron ore on the fluidity was further analyzed by using SEM and ion theory of slag. With the increase SiO2 content of iron ore, the fluidity index increased, the main reason was that the amount of liquid phase increased and melting point decreased during sintering. However, an excessive amount of SiO2 caused the decrease of fluidity index of iron ore, the main reason was that the fluidity of the liquid phase itself decreased and secondary hematite appeared. In the case of the SiO2 content of iron ore was higher, the main bonding phase was calcium silicate. With the decrease of SiO2 content, the calcium silicate transformed into calcium ferrite. This main reason was that the Gibbs free energy of calcium ferrite and dicalcium ferrite (2CaO·SiO2) was higher than that of calcium silicate in the temperature ranges of 400-1600 K. The reduction degree of YD was the highest in all the cases and that of GG was the lowest. Activation energies of 5.39, 3.14, 3.51, 4.47 and 2.92 kJ/mol were obtained for the reduction of GG, PB, BH, SJY, and YD, respectively. In all the cases, the reaction corresponded to the model function of F1(α), and the integral form was -ln(1-α)=kt. Through this investigation, it could be concluded that the most appropriate ore category for sinter pot was YD.

Influence of iron ore concentrate on the characteristics of sintering and reduction of sinter