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Corrosion Behavior of Ceramic Cup of Blast Furnace Hearth by Liquid Iron and Slag

机译：铁水和矿渣对高炉炉缸陶瓷杯的腐蚀行为

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摘要

Three kinds of sample bricks of ceramic cups for blast furnace hearth were studied by dynamic corrosion tests based on different corrosion systems, i.e., liquid iron system, liquid slag system and liquid iron–slag system. Considering the influence of temperature and sample rotational speed, the corrosion profiles and mass loss of the samples were analyzed. In addition, the microstructure of the corroded samples was observed by optical microscope (OM) and scanning electron microscope (SEM). It was found that the corrosion profiles could be divided into iron corrosion region, slag corrosion region and iron–slag corrosion region via corrosion degree after iron–slag corrosion experiment. The most serious corrosion occurred in iron–slag corrosion region. This is due to Marangoni effect, which promotes a slag film formed between liquid iron and ceramic cup and results in local corrosion. The corrosion of the samples deepened with increasing temperature of liquid iron and slag from 1,623 K to 1,823 K. The variation of slag composition had greater influence on the erosion degree than that of rotational speed in this experiment. Taking these results into account the ceramic cup composition should be close to slag composition to decrease the chemical reaction. A microporous and strong material should be applied for ceramic cup.
机译：通过基于不同腐蚀系统的动态腐蚀试验研究了三种高炉炉缸用陶瓷杯样砖，即铁水系统，铁水系统和铁渣系统。考虑到温度和样品转速的影响，分析了样品的腐蚀曲线和质量损失。另外，通过光学显微镜（OM）和扫描电子显微镜（SEM）观察腐蚀样品的微观结构。经铁渣腐蚀实验后，腐蚀程度可根据腐蚀程度分为铁腐蚀区，渣腐蚀区和铁渣腐蚀区。最严重的腐蚀发生在铁渣腐蚀区域。这是由于马兰戈尼效应引起的，该效应促进了铁水和陶瓷杯之间形成的渣膜并导致局部腐蚀。随着铁水和炉渣温度从1,623 K增加到1,823 K，样品的腐蚀加深。在该实验中，炉渣成分的变化对腐蚀程度的影响大于转速的影响。考虑到这些结果，陶瓷杯的成分应接近炉渣成分，以减少化学反应。微孔且坚固的材料应用于陶瓷杯。

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