Influencing mechanism of Al ₂ O ₃ on sintered liquid phase of iron ore fines based on thermal and kinetic analysis

Abstract

The sintering behaviour of ore fines under different Al 2 O 3 content and different alkalinity was studied by DSC–TG method. The reaction kinetics of the sintering process was calculated. Simultaneously, the experimental products were analysed by microscopic analysis. The effects of different content of Al 2 O 3 and alkalinity on the sintered liquid phase were investigated. The results show that the increase of Al 2 O 3 ’s content promoted the formation of calcium ferrite and the increase of liquid phase's formation in a certain range. When the content of Al 2 O 3 is 2.5%, that is, A/S = 0.42, the heat flux is the largest, correspondingly, the maximum amount of liquid phase is formed under this condition. The liquid phase's formation during the reaction under high alkalinity conditions is greater than that under low alkalinity conditions. The influencing mechanism of Al 2 O 3 and alkalinity on the liquid phase of sintering is verified by the kinetic analysis.