高炉富氢对钒钛矿软熔滴落性能的影响

doi:10.13228/j.boyuan.issn0449-749x.20220696

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摘要高炉富氢冶金是降低高炉能耗与碳排放重要途径,研究了富氢还原对钒钛矿软熔滴落过程的影响,并采用历程中断法分析表征了钒钛矿渣铁形成过程中的还原度与初渣渣量的变化。研究结果表明,钒钛矿的软熔收缩行为与其还原过程密切相关,富氢还原失氧率加快使钒钛矿500～900 ℃的还原膨胀有所加剧,温度小于1 100 ℃时,FeO的大量生成使钒钛矿中低温收缩变形率增加,温度为1 100 ℃时,H₂的还原速率是CO还原速率的8倍,逐渐增厚的铁壳及初渣熔点的升高导致钒钛矿的熔融滴落温度升高。富氢率为10%时,高炉初渣渣量由接近900 kg/t降低到460 kg/t左右,初渣渣量减少将近1/2,接近终渣渣量,这将使煤气阻力损失明显降低,大大改善高炉软熔滴落带的透气性。同时富氢还原减少了高温条件下钒钛矿中FeO与钛铁矿FeTiO₃、钛铁晶石Fe₂TiO₄等含钛矿物的相互结合与耦合反应,促进了软熔带渣铁的分离,有效减少了炉腹泛液现象。冶炼钒钛矿高炉富氢后软熔带位置下移、厚度减薄,尤其是透气性最差的熔融区间变窄、透气性增加,这表明冶炼钒钛矿高炉富氢还原不仅可以降低高炉碳消耗与CO₂排放,而且改善了高炉软熔带的分布状态,促进了高炉的顺行高产。

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	郄亚娜
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关键词 ：富氢还原, 软熔收缩, 高炉初渣, 软熔带, 钒钛矿冶炼

Abstract：Hydrogen-rich metallurgy in blast furnace(BF) is an important way to reduce energy consumption and carbon emission.The influence of hydrogen-rich reduction on the process of softening and melt dripping of vanadium titanium ore was studied, and the change of reduction degree and amount of primary of vanadium-titaniumd burden during the process was analyzed by the process interruption method. The results showed that,the softening and shrinkage behavior of vanadium titanium ore is closely related to its reduction process. With the acceleration of hydrogen-rich reduction rate, the reduction expansion of vanadium-titanite at 500-900 ℃ is intensified. With the increase of FeO, the shrinkage deformation rate of vanadium-titanium ore increases below 1 100 ℃. The reduction rate of H₂ is 8 times of that of CO at 1 100 ℃. The gradually thickening iron shell and the increase of the melting point of the primary slag lead to the increase of the melting and droping temperature. When the hydrogen enrichment rate is 10%, the amount of primary smelting slag with vanadium titanium ore is reduced by half, from nearly 900 kg/t to about 460 kg/t, it is close to the final slag amount, which will reduce the gas resistance loss and greatly improve the permeability of cohensive zone of BF. Hydrogen-rich reduction reduces the interaction and coupling reaction between FeO and ilmenite FeTiO₃ and ilmenite SPAR Fe₂TiO₄ at high temperature, which promotes the separation of melting slag and metal iron in cohensive zone, and effectively reduces the flooding phenomenon of melt in the bosh.The hydrogen-rich operation of BF with vanadium titanium ore will make the cohensive zone move down and the thickness thin, especially the melting zone with the worst permeability become narrowed. This indicates that hydrogen-rich reduction of BF with vanadium titanite ore not only reduces the carbon consumption and CO₂emission, but also improves the state of cohensive zone and promotes the anterograde high yield of BF.

Key words： hydrogen-rich reduction sofening and shrinkage BF primary slag cohensive zone vanadium titanium ore

收稿日期: 2022-11-11

引用本文:

郄亚娜, 靳亚涛, 康媛, 李丽芬, 王艺帆, 王新东. 高炉富氢对钒钛矿软熔滴落性能的影响[J]. 钢铁, 2023, 58(5): 31-38. QIE Ya-na, JIN Ya-tao, KANG Yuan, LI Li-fen, WANG Yi-fan, WANG Xin-dong. Influence of hydrogen-rich on softening and melting property of blast furnace burden with vanadium and titanium[J]. Iron and Steel, 2023, 58(5): 31-38.

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