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Preparation and Properties of Porous Mullite Refractory Aggregates Prepared Using Coal Gangue as Starting Material

  • Jingjing Liu
  • Y. Li
  • B. Duan
  • S. Li
  • Y. Li
  • S. Sang
Review Papers

Abstract

Porous mullite refractory aggregates were successfully fabricated via recycling of coal gangue and bauxite at temperatures ranging from 1100 to 1350°C, with chaff as the pore former. The phase compositions, microstructures, pore characterization, and cold crushing strength of the aggregates were systematically studied by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and mercury porosimetry associated with the thermodynamics analysis. The results showed that the firing temperature had a pronounced effect on the phase compositions, the morphology of mullite, the bonding between the mullite crystals, the pore structures (e.g. apparent porosity, average pore size, and distribution of pore sizes), and the cold crushing strength. In addition, secondary mullitization, which occurred at 1100°C, was gradually enhanced with increasing firing temperature. The maximum apparent porosity and highest <8 µm pore volume of 57.5% and 28.2%, respectively, were obtained at 1300°C, and resulted mainly from an increase in the liquid content and the volume expansion effect of the mullitization-crystal-growth process. The firing temperature had a positive effect on the morphology of and the bonding between the mullite crystals. Accordingly, the low porosity and excellent bonding between the mullite crystals resulted in an enhancement of the cold crushing strength.

Keywords

coal gangue porous mullite refractory aggregates porosity microstructure cold crushing strength 

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Copyright information

© Springer Fachmedien Wiesbaden 2015

Authors and Affiliations

  • Jingjing Liu
    • 1
  • Y. Li
    • 1
  • B. Duan
    • 2
  • S. Li
    • 1
  • Y. Li
    • 1
  • S. Sang
    • 1
  1. 1.The State Key Laboratory of Refractories and MetallurgyWuhan University of Science and TechnologyWuhanChina
  2. 2.Sinosteel Luoyang Institute of Refractories Research Co., LtdLuoyangChina

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