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Effect of MgO on Highly Basic Sinters with High Al2O3

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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. In order to solve this problem, 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 sinter pot test. Nova400NanoSEM field emission scanning electron microscope was used to analyze sinter microstructure. The experimental results show that when the MgO content fraction in the sinter with high basicity and high aluminum increases from 1.72 to 2.49%, the vertical sintering speed decreases by 4.38mm/min, the utilization coefficient decreases by 0.51t/(m2 h), and the low-temperature reduction degradation index increases by 6.7%. When MgO content in sinter is 2.11%, drum index and reducibility index are the highest, reaching 61.93% and 86.39% respectively. Mg2+ is mainly solid dissolved in the magnetite lattice and replaces Fe2+, up to 3.64%. The generated magnesie-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 sinter.

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Funding

We would like to express our sincere gratitude to the national Natural Science Foundation of China (No. 51604199) and the State Key Laboratory of Refractory Materials and Metallurgy (No. 2014QN20) for their support of this work.

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Authors and Affiliations

  1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China

    Zhengming Yi, Qiang Liu & Huijun Shao

  2. National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan, 430081, China

    Zhengming Yi & Huijun Shao

  3. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan, 430081, China

    Qiang Liu

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  1. Zhengming Yi
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  2. Qiang Liu
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Correspondence to Zhengming Yi.

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Yi, Z., Liu, Q. & Shao, H. Effect of MgO on Highly Basic Sinters with High Al2O3. Mining, Metallurgy & Exploration 38, 2175–2183 (2021). https://doi.org/10.1007/s42461-021-00445-4

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  • DOI: https://doi.org/10.1007/s42461-021-00445-4

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