Influence of MgO on high basicity high alumina sinter
YI Zheng-ming1,2, QIN Jia-zhuo1,2, JIANG Zhi-wei1, QIN Qing-wei1, SHAO Hui-jun1, DU Dong3
1. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 2. National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 3. Coking Division, Shuicheng Iron and Steel Group Co., Ltd., Liupanshui 553000, Guizhou, China
Abstract:The increase of the proportion of high Al2O3 content iron ore fine in iron and steel enterprises has brought about a series of problems such as the increase of the viscosity of blast furnace slag and the difficulty of the separation of slag and iron. The effect of increasing MgO content on the technical and economic index, the cold strength, and metallurgical properties of high basicity and high alumina sinter was studied through the sinter pot test. Nova400 NanoSEM field emission scanning electron microscope was used to analyze the microstructure of the sinter. The experimental results show that when the mass percent of MgO in the sinter with high alkalinity and high aluminum increases from 1.72% to 2.49%, the vertical sintering speed decreases by 4.38 mm/min, the utilization coefficient decreases by 0.51 t/(m2·h), and the low-temperature reduction degradation index increases by 6.7%. When the mass percent of MgO in the sinter is 2.11%, the drum index and the reducibility index are the highest, reaching 61.93% and 86.39% respectively. Mg2+ is mainly solid dissolved in the magnetite lattice and replaces Fe2+, and the mass fraction of the replacement reaches up to 3.64%. The generated magnesium-containing magnetite inhibits the phase transition from Fe3O4 to Fe2O3 oxidation process in the sinter cooling process, which reduces the generation of secondary hematite and is conducive to improving the low-temperature reduction degradation performance of the sinter. The research results can provide theoretical guidance and reference for improving the properties of high-basicity and high-alumina sinter and adjusting the fluidity of blast furnace slag.
易正明, 覃佳卓, 姜志伟, 秦庆伟, 邵慧君, 杜东. MgO对高碱度高铝烧结矿的影响[J]. 钢铁, 2021, 56(2): 50-56.
YI Zheng-ming, QIN Jia-zhuo, JIANG Zhi-wei, QIN Qing-wei, SHAO Hui-jun, DU Dong. Influence of MgO on high basicity high alumina sinter[J]. Iron and Steel, 2021, 56(2): 50-56.
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