7TH EUROPEAN COKE AND IRONMAKING CONGRESS - ECIC 2016

Effects of MgO on the sintering liquid, the properties and mineralogical morphology of the high-basicity sinter were investigated in this paper. The results show that the assimilability and the infiltration area index of original liquid (IAO) decreases with increasing MgO content. The tumbler index (T), the low temperature break-down (RDI+3.15) and softening start temperature (T10%) of the sinter increases first and then decreases with increasing MgO content, whereas the reduction degree (RI) and softening interval (∆T) of the sinter exhibit the opposite behavior. With increasing MgO content, the content of the SFCA and hematite in sinter decrease, but magnetite content increase, the mineral distribution becomes uneven. the cracks and the pores in bonding phase increase; The metallic phase composed of hematite, SFCA and silicate calcium and the metallic phase composed of magnetite and glassiness transforms to the phase of interlaced corrosion structure composed by magnetite, SFCA and merwinite. To improve the high-basicity sinter properties and decrease the fuel consumption, the MgO content should be kept within 3.30wt% in ore proportioning.