Preparation and characterization of corundum-mullite-spinel refractories from low-grade bauxite and magnesite ores

DOI Web Site 被引用文献1件 参考文献16件
  • LI Xiaochao
    School of Materials Science and Technology, Beijing Key Laboratory of Material Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, China University of Geosciences (Beijing)
  • CHEN Shusen
    School of Materials Science and Technology, Beijing Key Laboratory of Material Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, China University of Geosciences (Beijing)
  • DING Hao
    School of Materials Science and Technology, Beijing Key Laboratory of Material Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, China University of Geosciences (Beijing)
  • HUANG Zhaohui
    School of Materials Science and Technology, Beijing Key Laboratory of Material Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, China University of Geosciences (Beijing)
  • FANG Minghao
    School of Materials Science and Technology, Beijing Key Laboratory of Material Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, China University of Geosciences (Beijing)
  • LIU Yan’gai
    School of Materials Science and Technology, Beijing Key Laboratory of Material Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, China University of Geosciences (Beijing)
  • WU Xiaowen
    School of Materials Science and Technology, Beijing Key Laboratory of Material Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, China University of Geosciences (Beijing)

抄録

Corundum-mullite-spinel composite refractories with excellent mechanical properties were prepared from low-grade ores and γ-Al2O3 sintered at 1400–1550°C. The influences of low-grade magnesite minerals and sintering temperature on the phase composition evolution, bending strength, and microstructure were studied. Their phase compositions and microstructures of the samples were determined with X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). According to characterization results, the bending strength of the samples significantly increased with the increase of magnesite addition, whereas the bending strength firstly increased and then decreased with the sintering temperature rise. Compared with the samples prepared under other conditions, the samples prepared with 12 mass % magnesite addition at 1500°C showed the better properties: the bulk density of 2.92 g/cm3, flexural strength of 117.56 MPa. The crystalline phases of samples were corundum, mullite, and MgAl2O4 spinel. SEM and EDS revealed that mullite grains existed in long columnar forms with interlocking network structure and MgAl2O4 spinel grains existed in octahedral forms. Some impurities were incorporated into crystals to form a transitory liquid phase sintering. The above SEM results contributed to the improved densification behavior and the enhanced bending strength.

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