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烧结矿是现代高炉生产的主要含铁原料。合理控制入炉烧结矿的理化性能与冶金性能对高炉生产和稳定操作是很必要的。铁矿粉是烧结矿的主要原料,其化学成分和烧结料层内的热量条件在烧结过程中起着重要的作用。化学成分等参数也决定着烧结矿矿相结构和质量。由于含氧化铝原料的低反应性及其液相的高粘性,因此在人们的预料中高铝矿石对烧结矿结构组成的影响并不好。烧结混合料中的氧化铝在同化过程中需要消耗大量热量,延迟烧结过程。在确保高炉渣的流动性方面,氧化铝也需要消耗较大热量。不论是烧结还是高炉的生产实绩均表明,氧化铝是有害的。一般而言,高含铁量与低脉石的印度矿与其他矿石的不同特点就是氧化铝含量高。由于高品味铁矿石的消耗殆尽,使用可利用的烧结原料成为生产必需。因此,必须要掌握氧化铝的作用及其对烧结矿质量和生产过程的影响。实验室完成了不同氧化铝含量水平(2.00%～5.46%)的实验,可从中了解氧化铝在烧结矿矿物学、生产率、物理性能和冶金性能方面的影响。随着烧结矿中氧化铝含量的增加,残存赤铁矿、复合铁酸钙(SFCA)和孔隙率增加,而磁铁矿和硅酸盐比例下降。烧结生产率和烧结矿转鼓强度(TI)随着氧化铝含量上升而下降,反映烧结矿冶金性能的诸如低温还原粉化率(RDI)和还原率(RI)提高。
Sinter is the main ferrous raw material for the production of modern blast furnaces. Reasonable control of the physical and chemical properties and metallurgical properties of the sinter into the furnace is necessary for blast furnace production and stable operation. Iron ore powder is the main raw material for sinter. The chemical composition and thermal conditions in the sintering bed play an important role in the sintering process. Chemical composition and other parameters also determine the sinter ore phase structure and quality. Due to the low reactivity of the alumina-containing feedstock and the high viscosity of the liquid phase, it is not expected that high-alumina ores will have a significant effect on the composition of the sinter structure. The alumina in the sinter mix requires a significant amount of heat to be consumed in the assimilation process, delaying the sintering process. Alumina also needs to consume a large amount of heat to ensure the fluidity of blast-furnace slag. Whether it is sintered or blast furnace production results show that alumina is harmful. In general, the different characteristics of Indian and other ores with high iron content and low gangue are high alumina contents. Due to the depletion of high-taste iron ore, the use of available sinter raw materials becomes essential for production. Therefore, we must grasp the role of alumina and its impact on the quality and production of sinter. The laboratory completed experiments with different alumina levels (2.00% to 5.46%) to understand the effects of alumina on the mineralogy, productivity, physical properties and metallurgical properties of sinter. With the increase of alumina content in sinter, the residual hematite, composite calcium ferrite (SFCA) and porosity increase while the proportion of magnetite and silicate decreases. Sinter productivity and sinter drum strength (TI) decrease with increasing alumina content, reflecting improvements in metallurgical properties of the sinter such as low temperature reduction pulverization (RDI) and reduction rate (RI).