莱钢烧结、高炉锌的分布及平衡研究

Zinc Distribution and Balance Study in the Sinter and Blast Furnace of Laiwu Steel

对莱钢型钢区域的烧结、高炉进行了系统的锌分布及平衡研究。结果表明,265m2烧结机的锌金属带入量为0.88kg/t,主要由混匀料和冷返矿+灰带入(合计95.40%),由烧结矿和返矿带出(合计97.77%);1#高炉的锌金属带入量为0.85kg/t,主要由烧结矿和球团矿带入(合计92.45%),由重力灰和布袋灰排出(合计82.86%)。结合莱钢生产实际,提出了降低锌带入量及提高脱锌率的建议,如除尘灰、污泥等通过转底炉脱锌后再利用,通过高炉操作降锌等。

This article studied zinc distribution and balance in Laiwu Steel＇s Structure Steel sinter and the blast furnace.The results showed that：the zinc amount brought to the 265 m2 sintering machine was 0.88 kg/t;it was brought mainly by blending,cold return fines and ash（total 95.40%）and carried off by sinter ore and return fines（total 97.77%）;the zinc amount brought to the No.1 BF was 0.85 kg/t,and it was brought by sinter ore and pellet（total 92.45%）and removed by gravitational dust and bag dust（total 82.86%）.With the practice production of Laiwu Steel,the suggestion to reduce Zn-input and improve Zn-remove rate were proposed,such as,precipitator dust,sludge etc were reused after dezincing by rotary hearth furnace,reducing the zinc content by BF operation.