Mining tailings as raw materials for reaction-sintered aluminosilicate ceramics: Effect of mineralogical composition on microstructure and properties

Marjaana Karhu, Juha Lagerbom, Soili Solismaa, Mari Honkanen, Arnold Ismailov, Marja Liisa Räisänen, Elina Huttunen-Saarivirta, Erkki Levänen, Päivi Kivikytö-Reponen

    Tutkimustuotos: ArtikkeliScientificvertaisarvioitu

    8 Sitaatiot (Scopus)
    35 Lataukset (Pure)

    Abstrakti

    This paper presents studies on the utilization of aluminosilicate-based mining tailings as raw materials for mullite-based ceramics. Based on the 3:2 stoichiometric composition, mullite was synthesised by reactive sintering with a series of powder mixtures with alumina additions. X-ray diffractometry and scanning electron microscopy analyses revealed that, at the specific mineralogical composition, mullite structure formed surrounded by an amorphous glass phase in reaction-sintered powder mixtures. Results demonstrated that the chemical and mineralogical composition of mining tailings do have an effect on mullite formation possibilities and, only with the particular mineralogical composition, the mullite formation is possible regardless of the correct Al:Si ratio in tailings. Physical and mechanical properties of the formed ceramics were defined, showing comparable values to 3:2 mullite reference. Mullite structure formation enables a better thermal resistance up to above 1450 °C of the formed tailings-based ceramics compared to other aluminosilicates, reflecting their utilization potential for refractory ceramic applications.

    AlkuperäiskieliEnglanti
    Sivut4840-4848
    JulkaisuCeramics International
    Vuosikerta45
    Numero4
    Varhainen verkossa julkaisun päivämäärä2018
    DOI - pysyväislinkit
    TilaJulkaistu - maalisk. 2019
    OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

    Julkaisufoorumi-taso

    • Jufo-taso 1

    !!ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Ceramics and Composites
    • Process Chemistry and Technology
    • Surfaces, Coatings and Films
    • Materials Chemistry

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