转炉COMI技术对冶炼过程铁损失的影响研究

Study on the Influence of Converter COMI Technology on Iron Loss in Smelting Process

主要研究了转炉顶底复吹CO_(2)工艺(COMI技术)对冶炼过程铁损失的影响,综合考虑了渣中铁损失、烟尘中铁损失等对转炉铁损的影响。首先基于CO_(2)参与炼钢氧化反应的热力学和动力学研究,分析了喷吹CO_(2)对转炉冶炼的影响;其后,在一座120 t转炉进行工业试验,通过对渣中FeO含量、粗灰产量、冷却剂用量的综合分析,研究了应用转炉COMI技术对120 t转炉冶炼过程铁损的影响。工业试验结果表明,转炉顶吹混掺CO_(2)总量为200 m^(3)/炉(标准),CO_(2)试验炉次相比常规冶炼炉次的炉渣(FeO)含量平均减少了0.61%,则渣中铁损减少了0.1 kg/吨钢,粗灰产生量减少了94.88 kg/炉,粗灰产生量降幅达到21.4%,则粗灰中的铁损降低了0.5 kg/吨钢,烧结矿消耗量减少了5.93 kg/t。最后,在综合分析渣中铁损、粗灰中的铁损和烧结矿消耗量,使用COMI技术可以降低铁损3.54 kg/t。

The influence of the CO_(2)process(COMI technology)on the iron loss in the smelting process is mainly studied,and the effects of iron loss in slag and iron loss in soot on the iron loss of converter are comprehensively considered.Firstly,based on the thermodynamic and kinetic studies of CO_(2)involved in the oxidation reaction of steelmaking,the influence of CO_(2)injection on converter smelting was analyzed.Subsequently,industrial experiments were carried out in a 120 t converter,and the influence of COMI technology on the iron loss of the 120 t converter smelting process was studied through a comprehensive analysis of the FeO content in the slag,the coarse ash yield and the coolant dosage.The results show that the total amount of CO_(2)mixed with converter top blowing is 200 Nm^(3)/furnace,the slag(FeO)content of the test furnace is reduced by 0.61%on average compared with the conventional furnace,and the iron loss in the slag is reduced by 0.1 kg/ton steel;the amount of coarse ash produced decreased by 94.88 kg/furnace,and the reduction rate of production reached 21.4%,and the iron loss in coarse ash was reduced by 0.5 kg/ton steel;the sinter consumption was reduced by 5.93 kg/t compared with the conventional furnace,Finally,comprehensive analysis of iron loss in slag,iron loss in coarse ash and sinter consumption showed that the iron loss could be reduced by 3.54 kg/t using COMI technology.