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作为改善烧结矿低温还原粉化性能的基础,通过对不同氧分压下的赤铁矿进行热重分析,并结合显微镜下面积法,研究了赤铁矿的分解和二次赤铁矿的生成机理。实验结果表明:二次赤铁矿生成过程中自身存在大量裂纹,是产生低温还原粉化的主要因素,而气氛和温度是影响二次赤铁矿生成的重要因素;实验还获得了不同氧分压下二次赤铁矿的生成规律以及赤铁矿、磁铁矿、二次赤铁矿之间的转化关系,为降低烧结矿低温还原粉化率,合理控制烧结气氛和烧结温度提供了实验依据。
As the basis of improving the low-temperature reduction pulverization performance of sinter, the hematite decomposition and hematite formation were studied by thermogravimetric analysis of hematite with different partial pressure of oxygen and combined with the area under microscope mechanism. The experimental results show that there are a large number of cracks in secondary hematite, which are the main factors of low temperature reduction pulverization. However, the atmosphere and temperature are important factors affecting the secondary hematite formation. The formation of secondary hematite is suppressed and the transformation relationship between hematite, magnetite and secondary hematite is provided. Experiments are conducted to reduce the reduction rate of sinter ore and control the sintering atmosphere and sintering temperature reasonably in accordance with.