莱钢高炉解剖软熔带含铁炉料特性分析

Dissection analysis of soft-melting zone of blast furnace in Laisteel

基于莱钢2007年120 m3生产高炉科学解剖研究内容,系统分析了含铁炉料在软熔带位置物化属性。结果表明,高炉软熔带呈不规则倒V形分布,软熔层矿石还原度由低温侧向高温侧逐渐增加,其中烧结矿的还原度由40%~70%增加至80%~95%,球团矿的还原度由40%~50%增加至70%。软熔层低温侧烧结矿金属化率为20%~45%,球团矿的金属化率为10%~20%,在高温侧烧结矿的金属化率为70%~95%,球团矿的金属化率约为50%~70%。含铁炉料在软熔带区域发生了剧烈的还原反应,其中烧结矿金属化率增加的幅度大于球团矿的主要原因为烧结矿的还原性好于球团矿的还原性。矿相分析表明软熔带中球团矿已没有Fe2O3、Fe3O4存在,铁主要以FeO和金属铁存在,在软熔带区域存在被还原生成中空的铁壳球团矿。

Based on the dissection of 120 m3 blast furnace on Laisteel in 2007, the phy-chemical properties of furnace charge in the cohesive zone were systematically analyzed. According to the result, it is found that the cohesive zone was irregular inverted V-shape, and the reduction of ore at the cohesive layer increased from the cooler side to the hotter side. The reduction degree of sinter increased from 40%-70% to 80%-95%, and the reduction of pellets increased from 40%-50% to 70%. The metallization rate of sinter and pellets at low temperature side was 20%-45% and 10%-20%, respectively, while at the high temperature side, it was 70%-95% and 50%-70%, respectively. A violent reduction reaction was of iron bearing furnace material was occurred in the cohesive zone, and the increase amplitude of the metallization rate in sinter was higher than the pellet, which caused that the reduction of sinter was better than the pellet. According to the observation of mineral phases, there was no Fe2O3and Fe3O4 in the pellet in the cohesive zone, FeO and metallic iron mainly existed in the iron phase, and there were the hollow iron shell pellets after the reduction in the cohesive zone.