废钢在高炉内软熔性能研究及应用

为了研究废钢在高炉内的软熔滴落行为,为高炉使用轻薄型废钢冶炼提供技术支撑,采用RDL-2000型熔滴炉对废钢的软熔性能进行了研究,并与烧结矿的性能进行了对比分析。研究表明,废钢在高炉内会发生明显的渗碳反应,其滴落温度远低于纯铁及常规烧结矿,1 000 ℃以前有明显的体积膨胀,其明显的体积收缩均发生在1 200 ℃以上,没有明显的压差陡升现象,没有明显的熔融区间,可以降低炉料的软熔区间,有利于改善软熔带的透气性。梅钢高炉生产实践表明,高炉配加一定比例的废钢后,能够显著提高生产效率,降低燃料消耗,在120 kg/t的使用量时,增产率达到近20%,燃料比降低近30 kg/t。

Research on cohesive characteristic of scrap and utilization practice

In order to study the scrap characteristics supporting the BF production with scrap, the scrap cohesive characteristic is researched with the RDL-2000 melt furnace.The result shows that the scrap can be carburized in the BF; its drop temperature is far lower than pure iron and sinter. There is obvious volume expansion before 1 000 ℃, and the obvious volume shrinkage occurs above 1 200 ℃. There is no obvious sharp rise of pressure difference and no obvious melting zone,so that it can decrease the pressure of cohesive region of BF charge volume.In practice, when Meigang BF runs with some light scrap charging, the BF maintains steady and direct for long, its efficiency increased almost 20%. And the fuel ratio decreased 30 kg/t, with 120 kg/t scrap.