Li Zhexi, Li Tingle, Sun Changyu, Yang Songtao, Wang Qi
School of Materials and Metallurgy, University of Science and Technology, Anshan 114051, China.
Materials (Basel). 2023 Aug 6;16(15):5490. doi: 10.3390/ma16155490.
The softening-melting properties of mixed ferrous burden made from high-basicity sinter with increased MgO and AlO content and acid pellets was investigated for optimization. The influences of MgO and AlO are discussed with the aid of phase analysis. The results showed that, with decreasing MgO mass%/AlO mass% in mixed burden, all the softening-melting characteristic temperatures decreased, which can be attributed to the low melting temperature and viscosity of the slag caused by MgO and AlO. The permeability of the melting zone deteriorated again when MgO mass%/AlO mass% decreased to a certain content. The softening interval widened slightly at first and then narrowed, while the melting interval first increased slightly and then increased greatly later. It can be deduced that the softening properties were improved, but the melting properties were worsened. Under comprehensive consideration of its softening-melting properties, permeability, iron ore reduction and the thermal state of the blast furnace hearth, the optimal softening-melting properties of a mixed ferrous burden with MgO mass%/AlO mass% of 0.82 is optimal.
为实现优化，对由MgO和Al₂O₃含量增加的高碱度烧结矿与酸性球团制成的混合含铁炉料的软化-熔化特性进行了研究。借助相分析讨论了MgO和Al₂O₃的影响。结果表明，随着混合炉料中MgO质量分数/Al₂O₃质量分数的降低，所有软化-熔化特征温度均降低，这可归因于MgO和Al₂O₃导致炉渣的熔化温度和粘度较低。当MgO质量分数/Al₂O₃质量分数降低到一定含量时，熔化带的透气性再次变差。软化区间起初略有变宽，随后变窄，而熔化区间起初略有增加，随后大幅增加。可以推断，软化性能得到改善，但熔化性能变差。综合考虑其软化-熔化性能、透气性、铁矿石还原以及高炉炉缸的热状态，MgO质量分数/Al₂O₃质量分数为0.82的混合含铁炉料具有最佳的软化-熔化性能。
