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Recycling Bauxite Waste for the Mineral Industry: Phase Transformations and Microstructure During Sintering

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Abstract

Raw materials of mineral industries are mainly in the form of ore, which generate fine mineral particles during the extraction, comminution and transport which are primarily regarded as non-recyclable waste. The aim of this paper is to develop and characterize materials using recycled fine particles of bauxite sintered at high temperature at a laboratory scale for the calcium aluminate industry. To use these recycled materials as raw materials, the physico-chemical transformations during high-temperature processing are described. Phase transformations as a function of temperature were determined by XRD, and optical and electronic microscopies were utilized to observe microstructures. Materials with different particle size distributions showed different chemical reactivity as a function of particle size. The optimization of particle size distribution makes it possible to substitute synthetic bricks for bauxite ore using recycled fine particles of bauxite.

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Authors and Affiliations

  1. CNRS, CEMHTI UPR3079, Univ. Orléans, 45071, Orléans Cedex 2, France

    R. Michel, E. de Bilbao & J. Poirier

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  1. R. Michel
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  2. E. de Bilbao
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  3. J. Poirier
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Correspondence to J. Poirier.

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Michel, R., de Bilbao, E. & Poirier, J. Recycling Bauxite Waste for the Mineral Industry: Phase Transformations and Microstructure During Sintering. Waste Biomass Valor 9, 1261–1271 (2018). https://doi.org/10.1007/s12649-016-9775-y

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  • DOI: https://doi.org/10.1007/s12649-016-9775-y

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