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首页> 外文期刊>ISIJ international >Recycling of Blast Furnace Sludge to the Blast Furnace via Cold-Bonded Briquettes: Evaluation of Feasibility and Influence on Operation
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Recycling of Blast Furnace Sludge to the Blast Furnace via Cold-Bonded Briquettes: Evaluation of Feasibility and Influence on Operation

机译：通过冷压团块将高炉污泥再循环到高炉：可行性评估及其对操作的影响

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摘要

Ore-based steelmaking generates various residues including dusts, sludges, scales and slags. Recycling of these residues within the process or via other applications is essential for sustainable production of steel. In blast furnace (BF) ironmaking, the gas-cleaning equipment generally recovers the particles in the off-gas as dust and sludge. Traditionally, the dry dust is recycled via the sinter or, in the case of pellet-based BF operation, via cold-bonded briquettes and injection. As the BF sludge mainly consists of iron and carbon, this residue is of interest to recycle together with the BF dust. However, depending on how the BF is operated, these two residues are more or less the major outlet of zinc from the furnace. Thus, to limit the recycled load of zinc, both materials cannot be recycled without dezincing the sludge prior to recycling. Dezincing and recycling of the low-zinc fraction of BF sludge via sinter have been reported whereas recycling via cold-bonded briquettes has not been performed. In the present study, cold-bonded briquettes containing the low-zinc fraction of dezinced BF sludge were charged as basket samples to the LKAB Experimental Blast Furnace (EBF). The excavated basket samples from the quenched EBF suggested that additions of up to 20 wt.% of upgraded BF sludge was feasible in terms of reducibility and strength. Based on these results, BF sludge were added to cold-bonded briquettes and charged in industrial-scale trials. The trials indicated that the annual generation of BF sludge, after dezincing, could be recycled to the BF.
机译：基于矿石的炼钢会产生各种残留物，包括粉尘，污泥，水垢和炉渣。在过程中或通过其他应用程序回收这些残留物对于钢铁的可持续生产至关重要。在高炉炼铁中，气体净化设备通常将废气中的颗粒回收为粉尘和污泥。传统上，干燥粉尘是通过烧结炉再循环的，或者在以颗粒为基础的高炉操作的情况下，是通过冷粘合团块和注射进行再循环的。由于高炉污泥主要由铁和碳组成，因此有兴趣将该残留物与高炉粉尘一起再循环。但是，根据高炉的操作方式，这两种残留物或多或少是炉中锌的主要出口。因此，为了限制锌的再循环负荷，在再循环之前，如果不对污泥进行脱锌，则不能将两种材料再循环。据报道，通过烧结对高炉渣污泥中的低锌部分进行了脱锌和再循环处理，而未通过冷粘结团块进行再循环处理。在本研究中，将含锌含量低的高炉污泥的冷粘结团块作为篮子样品装入LKAB实验高炉（EBF）。从淬火的EBF挖出的篮子样品表明，就还原性和强度而言，添加高达20 wt。％的高炉高炉污泥是可行的。根据这些结果，将高炉污泥添加到冷粘合团块中，并进行工业规模的试验。试验表明，脱锌后，每年产生的高炉污泥可以循环回高炉。

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