为了模拟高炉块状带内矿石还原过程对料层透气性的影响,根据实际高炉料层的运动升温及煤气成分的变化情况,设计了模拟矿石在高炉块状带行程的试验方法,建立了能够实时监测料层压差和矿石还原度的试验装置,给出了矿石逐渐升温还原对料层透气性影响的量化评价指标,并实测了某高炉烧结矿、球团矿、块矿、混合矿石在逐渐升温过程中的料层压差和还原度变化,得出逐渐升温还原后的粉化指标和料层压差增加率具有很好的一致性。与原有的低温还原粉化测试方法相比,该方法更适合用于判断高炉整个块状带内矿石还原对料层透气性的影响,更有利于评价矿石性能对高炉操作的影响。试验还研究了原始粒径、还原失重、还原温度、还原时间、加热、转鼓、泡水对矿石粉化程度的影响。
To simulate the effect of iron ore reduction in lumpy zone on the permeability of stock column in BF,the experimental methods were designed according to the actual movement of burden,temperature distribution and gas compositions.The equipments were built which could monitor the pressure drop of burden column and reduction index of ore at real-time.The evaluating indicators for the effects of gradually temperature rise and reduction of ore on the permeability of burden column were given.The pressure drop of burden column and the reduction index of sinter,pellet,lump ore and mixed ores were tested.It is found that the degradation index after gradually temperature rise and reduction has good correlation with the increment rate of pressure drop of burden column,which is more proper to judge the effect of ore reduction in the entire lumpy zone in BF on the permeability of burden column and to evaluate the effect of ore property on BF operation than conventional low temperature test of reduction degradation.The influences of testing factors on the ore degradation were also studied,including original particle size,weight loss by reduction,reduction temperature,reduction time,heating,drumming and soaking.
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