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Thermal behavior of a mineral mixture of sepiolite and dolomite

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Abstract

An industrial raw material taken from Beypazarı (Ankara, Turkey) region was heated at different temperatures in the 100–1100°C interval for 2 h. The volumetric percentage of particles having diameter below 2 μm in an aqueous suspension of the material held 24 h were determined as 85% by the particle size distribution analysis. The mineralogical composition of the material was obtained as mass% of 81% sepiolite, 15% dolomite, and 4% interparticle water by using the X-ray diffraction (XRD) and thermal analysis (TG, DTA) data. The temperature ranges were determined for the dehydrations of the interparticle water and the zeolitic water as 25–340°C, for the dehydration of the bound water as 340–580°C, and for the dehydroxylation of the hydroxyls as 800–833°C in the sepiolite. The zig-zag changes in the specific surface area (S/m2 g−1) and specific micro-and mesopore volume (V/cm3 g−1) with the temperature increases were discussed according to the dehydrations and dehydroxylation of the sepiolite.

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Authors and Affiliations

  1. Medical School, Department of Biochemistry, Dokuz Eylül University, Inciraltı, İzmir, Turkey

    Nilgün Yener

  2. Faculty of Science, Department of Chemistry, Ankara University, Tando ǧgan, Ankara, Turkey

    Müşerref Önal & Y. Sarıkaya

  3. Department of Geology, University of Cincinnati, Cincinnati, Ohio, USA

    Gökçe Üstünışık

Authors
  1. Nilgün Yener
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  2. Müşerref Önal
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  3. Gökçe Üstünışık
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  4. Y. Sarıkaya
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Correspondence to Y. Sarıkaya.

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Yener, N., Önal, M., Üstünışık, G. et al. Thermal behavior of a mineral mixture of sepiolite and dolomite. J Therm Anal Calorim 88, 813–817 (2007). https://doi.org/10.1007/s10973-005-7459-0

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  • DOI: https://doi.org/10.1007/s10973-005-7459-0

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