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首页> 外文期刊>ISIJ international >Reaction Behaviors of Mixed Burdens Consisting of Pellets and Sintered Ores in an Experimental Blast Furnace
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Reaction Behaviors of Mixed Burdens Consisting of Pellets and Sintered Ores in an Experimental Blast Furnace

机译：在实验高炉中由颗粒和烧结矿石组成的混合负担的反应行为

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Low-MgO sintered ores have developed into dominant burden materials for large blast furnaces operating under high pulverized coal injection in Japan, because of their low gangue content and high strength. Mixing MgO-bearing burdens with low-MgO sintered ores is an effective approach to satisfy the MgO requirement of blast furnaces. Therefore, a basket-evaluation test was performed in an experimental blast furnace (EBF) to investigate the reduction behavior of olivine pellets mixed with low-MgO sintered ores. The reduction behavior with lime-fluxed pellets was also evaluated as a reference. Softening-melting tests were also conducted under the same mixing conditions as those in the EBF tests. Olivine pellets exhibited smaller pores and contained finer hematite grains before reduction. These microstructural features influenced their reduction behavior, with low size disintegration observed in the lumpy zone in the EBF. Numerous cohesive masses with slag formed at the interface between sintered ores and lime-fluxed pellets in the EBF, facilitating their melting. In contrast, a small amount of slag was found at the interface between sintered ores and olivine pellets. The results of the softening-melting tests also revealed the superiority of olivine pellets during melting. Despite the low temperature of the initial melt formation during reduction, olivine pellets exhibited lower liquid ratios at high temperatures, resulting in a decrease in exuded slag when mixed with low-MgO sintered ores. This work proposes a general mechanism for the melting behaviors of mixed burden materials for blast furnaces.
机译：低MgO烧结矿石已经开发成在日本高粉煤喷射下运行的大型高炉的主控材料，因为它们的煤矸石含量低，强度高。用低MgO烧结矿石混合MgO负担是满足高炉MgO要求的有效方法。因此，在实验高炉（EBF）中进行篮子评估试验，以研究橄榄石颗粒与低MgO烧结矿石混合的还原行为。还评估了利润率粒料的减少行为作为参考。在与EBF测试中的相同的混合条件下也进行软化熔化试验。橄榄石颗粒表现出较小的毛孔，并且在还原之前含有更精细的赤铁矿颗粒。这些微观结构特征影响了它们的减少行为，在EBF的块状区域中观察到低尺寸的崩解。在EBF的烧结矿石和石灰助熔剂之间形成的炉渣中的许多粘性肿块，促进了它们的熔化。相反，在烧结矿石和橄榄石颗粒之间的界面中发现了少量渣。软化 - 熔化试验的结果还揭示了熔化过程中橄榄石颗粒的优越性。尽管还原过程中初始熔体形成的低温，但橄榄石颗粒在高温下表现出较低的液体比率，导致与低MgO烧结矿石混合时渗出渣的减少。这项工作提出了一种用于高炉混合负荷材料的熔化行为的一般机制。

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