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本文研究了碱金属和氟或两者综合,以及它们的不同存在状态对球团矿还原膨胀的影响。在模拟包钢工业球团的碱金属和氟含量的条件下,通过分步还原,发现球团矿的异常还原膨胀主要发生在第一还原阶段,并出现了严重的铁氧化物晶体开裂。只有在含碱金属特高的样品中在第三还原阶段出现严重的铁须。此外还研究了碱金属和氟对球团矿渣相热稳定性的影响.采用x射线衍射及Mossbauer谱分析了碱金属在铁氧化物不同还原阶段的赋存状态及其对它们的晶体结构的影响,借助于TDA对含碱金属铁氧化物的还原进行动力学分析,提出了碱金腻导致铁氧化物晶体开裂及铁须生长的机理模型。
In this paper, the effects of the combination of alkali metals and fluorine or both on the reduction and expansion of pellets were investigated. Under the condition of simulating the content of alkali metal and fluorine in Baotou Steel Industry Group, it was found that the abnormal reduction and expansion of the pellet occurred mainly in the first reduction stage and the serious iron oxide crystal cracking occurred through the step reduction. Severe iron whiskers were only present in the third reduction stage in samples containing extremely high levels of alkali metals. In addition, the influence of alkali metals and fluorine on the thermal stability of pellets was also studied.The occurrences of alkali metals in different reduction stages of iron oxides and their influence on their crystal structure were analyzed by X-ray diffraction and Mossbauer spectroscopy , Kinetic analysis of the reduction of alkali metal-containing iron oxides by means of TDA was carried out, and a mechanism model of alkali iron-induced cracking of iron oxides and growth of iron whiskers was proposed.