Effect of mineral composition of iron ore on metallurgical properties of sinter 铁矿粉矿物组成对烧结矿冶金性能的影响

In order to study the effect of the micro-mineral composition of the blended ore on the properties of sinter, the mineral composition of the iron ore powder was first analyzed by XRD refinement, then the sintering pot test was designed, and the metallurgical properties of the obtained sinter were detected and the microstructure of the sinter was observed. The obtained results are as follows. The hematite and quartz could increase the softening start temperature. The hematite is also beneficial to the reducibility of sinter. The kaolinite is not conducive to the maintenance of reducibility of sinter, and also reduces the softening start temperature of sinter, and makes the melting temperature interval increase. As the content of goethite increasing, the low-temperature RDI of sinter decreases first and then increases. In terms of mineral phase structure, the goethite is more likely to form the acicular calcium ferrite than hematite. The SiO2 produced by kaolinite decomposition is more active than quartz and is more likely to form the silicate phase. It is concluded that the hematite, goethite, kaolinite and quartz in the blended ore have a significant impact on the properties of sinter.