铁矿粉矿物组成对烧结矿冶金性能的影响

Effect of mineral composition of iron ore on metallurgical properties of sinter

为了研究混匀矿的微观矿物组成对烧结矿性能的影响,首先使用XRD精修手段定量分析了矿粉的矿物组成,进而设计烧结杯试验。通过检测试验所得烧结矿的冶金性能和观察所得烧结矿的矿相结构得到,赤铁矿、石英能促使软化开始温度升高,赤铁矿对烧结矿的还原性也是有利的,而高岭石不利于烧结矿还原性的维持,还会降低烧结矿的软化开始温度,使熔融温度区间增大。随着针铁矿含量增加,烧结矿低温还原粉化指数先降低后增高。在矿相结构方面,相较于赤铁矿,针铁矿更容易生成针状铁酸钙,高岭石分解产生的SiO2产生了硅酸盐相。由此可知,混匀矿中赤铁矿、针铁矿FeO(OH)、高岭石、石英等矿物对烧结矿的性能有着较为显著的影响。

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.