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首页> 外文期刊>Ironmaking & Steelmaking >Mixed burden softening and melting phenomena in blast furnace operation Part 2 - Mechanism of softening and melting and impact on cohesive zone
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Mixed burden softening and melting phenomena in blast furnace operation Part 2 - Mechanism of softening and melting and impact on cohesive zone

机译：高炉操作中的混合炉料软化和熔化现象第2部分-软化和熔化的机理及其对粘结区的影响

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摘要

The present work was designed to improve the current understanding of the softening and melting (SM) mechanism of ferrous materials and to identify their potential impact on the cohesive zone in the blast furnace (BF). The lump ore, direct reduced iron (DRI) and hot briquetted iron (HBI) were individually subjected to industrial trials and their results were compared with those obtained in the laboratory (SM) tests described in first part of the present paper. The difference between melting and 10 percent bed shrinkage temperature obtained from the results of laboratory and industrial tests was compared and it was found within 10 percent limits. The SM temperatures were also correlated to the basicity, gangue and flux contents of the mixed burden. The liquid slag mass fraction was computed using FactSage software and compared with the deformation of the burden bed. These results indicated presence of a small amount of liquid at temperatures close to the softening temperature of the burden suggesting that the deformation of solid phases is the primary cause for softening of the burden. The melting of the mixed burden is dependent on the melting point of DRI and melt exudation occurs close to the meltdown of the burden. The impact of ferrous burdens on the cohesive zone was predicted on the basis of experimental results which indicated DRI/HBI is an excellent blast furnace feed material to improve the productivity and decrease the coke rate in the BF.
机译：当前的工作旨在提高对含铁材料软化和熔化（SM）机理的当前了解，并确定它们对高炉（BF）内聚区的潜在影响。将块矿，直接还原铁（DRI）和热压块铁（HBI）分别进行工业试验，并将其结果与在本文第一部分所述的实验室（SM）测试中获得的结果进行比较。比较了实验室和工业测试结果得出的熔融温度与床缩温度的10％之间的差异，发现差异在10％的范围内。 SM温度还与混合物料的碱度，脉石和通量含量相关。使用FactSage软件计算液态炉渣的质量分数，并将其与炉料床的变形进行比较。这些结果表明在接近物料的软化温度的温度下存在少量液体，这表明固相的变形是物料软化的主要原因。混合物料的熔化取决于DRI的熔点，熔体渗出发生在物料熔化附近。根据实验结果预测了铁负载对内聚区的影响，表明DRI / HBI是提高生产效率和降低高炉焦炭率的出色高炉原料。

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