铁焦与铁矿石混装对高炉初渣形成的影响  

Effect of Ferro-Coke and Iron Ores Mixing Charging on Primary Slag Formation in Blast Furnace

作　　者：程向明[1] 毕学工[1] 史世庄[2] 马毅瑞 李鹏[1] 张慧轩[1] 

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081 [2]武汉科技大学湖北省煤转化与新型炭材料重点实验室,湖北武汉430081

出　　处：《钢铁》2014年第8期9-14,共6页Iron and Steel

基　　金：国家自然科学基金资助项目(51174149)

摘　　要：软熔带的形状和位置是影响高炉稳定运行的关键因素之一。研究了综合炉料中混入高反应性铁焦对高炉初成渣形成过程的影响。针对综合炉料进行研究,结果表明,铁焦的加入导致试样的变形开始温度降低,这是由于在较低温度下铁焦即开始与CO2反应,增加了煤气中的CO浓度与平衡浓度的差值,加速了铁矿石的间接还原。铁焦的加入一般使软化结束温度升高、滴落温度下降,使得软熔区间大幅度收窄,表明向铁矿石中混入铁焦能够显著改善高炉料柱的透气性。加入铁焦还使滴落熔铁中的碳含量明显提高。优先考虑对料柱透气性的影响,建议使用加入20%(质量分数)矿粉A的铁焦。The profile and position of the cohesive zone is one of the key factors affecting the blast furnace stable operation. The effect of ferro-coke mixing into the burden materials on primary slag formation process in the blast furnace was experimentally studied. Seven kinds of iron-bearing burden were studied. The results demonstrated that the addition of ferro-coke can lower the compression starting temperature of all samples. This is because ferro-coke starts to react with CO2 at lower temperatures and increases the difference between the CO concentration in gas and the equilibrium content, accel- erating the indirect reduction of iron ore. Moreover, the addition of ferro-coke would generally increase the softening-end temperature and decrease the melt-down temperature, leading to smaller softening-melting temperature range by a large margin. This suggests the mixing of ferro-coke into iron ores can remarkably improve the permeability of blast furnace stock. The addition of ferro-coke increased significantly the carbon content in dropped liquid iron. Giving priority to the effect on the stock permeability, it was suggested to use the ferro-coke prepared with 20% iron ore A.

关 键 词：高炉 铁焦混装 初成渣 

分 类 号：TF542[冶金工程—钢铁冶金]