Abstract:The proportion of pellets used in the blast furnaces at home and abroad in recent years were investigated. And the pellets chemical composition in different conditions were analyzed as well as its effects on the metallurgical properties of pellets. It is pointed out that the pellets produced by most of domestic steel enterprises possess low TFe mass percent and high SiO2 mass percent with larger fluctuation. The mass percent of Al2O3 and FeO varies greatly in different enterprises. The mass percent of SiO2、Al2O3and FeO should be controlled further. The pellet compress strength decreases with the increase of CaO and MgO mass percent. CaO with appropriate mass percent can improve the reduction expansibility of pellets.The increase of MgO mass percent can improve the reduction expansibility and softening-dripping performance of pellets. The combination of low MgO sinter, acidic pellet and magnesium-bearing pellet can sufficiently exploit the advantages of pellet metallurgical properties to realize the increase of pellet proportion used in blast furnace. The function mechanism of MgO and CaO in pellet baking process should be studied in detail, and how to control the content of liquid phase in magnesium-bearing pellet should be also investigated further in order to improve the pellet compress strength.
张淑会, 王宝勇, 兰臣臣, 刘小杰, 吕庆. 球团矿化学成分控制现状及展望[J]. 钢铁, 2020, 55(8): 19-26.
ZHANG Shu-hui, WANG Bao-yong, LAN Chen-chen, LIU Xiao-jie, LÜ Qing. Prospects and present status of pellets chemical composition control[J]. Iron and Steel, 2020, 55(8): 19-26.
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