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Improvement of sinter productivity by control of magnetite ore segregation in sintering bed

机译：通过控制烧结床磁铁矿矿石偏析改善烧结生产力

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Recently, the quality of sinter feed ore used in sintering process has deteriorated. In particular, Fe has decreased and gangue component has increased in the sinter feed ore. Increase of gangue is not only the factor to influence sinter qualities, but also the factor to increase coke ratio in the blast furnace operation as the increase of slag ratio. Therefore, to cope with the deterioration of iron ore qualities, studies on alternative iron ore resources and development of its utilisation technology have been required.In that kind of new iron ore resources, authors focus on high-grade magnetite fine. High-grade magnetite fine decreases sinter productivity by the decrease of permeability of sintering bed. Therefore a new study for using large amount of magnetite fine is required. In the past, there are some studies about the effect of mixing ratio and size of magnetite fine on productivity and quality, but there are few studies about magnetite fine segregation in charging.In this research, the melting behaviour and interfacial reaction calcium-ferrite, which has important role as bonding agent among iron ores, melts into hematite substrate and magnetite substrate was studied. As the results, it was defined that upper segregation of high-grade magnetite fine is suitable for productivity of sintered ore. Based on this knowledge, the control method of high-grade magnetite fine segregation by magnetic force at charging was studied with DEM (discrete element method) and its verification experiments for magnetic segregation control was conducted in the laboratory.
机译：最近，烧结过程中使用的烧结饲料矿石的质量劣化。特别是，Fe降低，煤矿饲料矿石中的膨胀部件增加。煤矸石的增加不仅是影响烧结素质的因素，还是增加高炉运行中焦炭比的因素作为渣渣的增加。因此，为了应对铁矿石品质的恶化，需要研究替代铁矿石资源和利用技术的发展。在那种新的铁矿石资源中，作者侧重于高档磁铁矿。通过烧结床的渗透率降低，高级磁铁矿精细降低烧结生产率。因此，需要使用大量磁铁矿的新研究。在过去，有一些关于混合比和磁铁矿尺寸对生产率和质量的影响的研究，但是关于充电中的磁铁矿细偏析的研究很少。在该研究中，熔化行为和界面反应钙铁氧体，在铁矿石中作为粘合剂具有重要作用，研究了融化到赤铁矿底物和磁铁矿基板中。结果，定义了高档磁铁矿的上层偏析适用于烧结矿石的生产率。基于这种知识，研究了通过DEM（离散元素法）对充电时磁力进行充电的高等磁铁矿细偏析的控制方法，并在实验室进行了磁隔离控制的验证实验。

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