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Effect of grinding on thermal reactivity of ceramic clay minerals

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Abstract

The effect of grinding on thermal behavior of pyrophyllite and talc as commonly used ceramic clay minerals was investigated by DTA, TG, emanation thermal analysis (ETA), B.E.T. surface area (s.a.) measurements, X-ray diffraction (XRD) and scanning electron microscopy (SEM).

A vibratory mill was used in this study, grinding time was 5 min. It was found that the grinding caused an increase in surface area and a grain size reduction of the samples. From TG and DTA results it followed that grinding caused a decrease of the temperature at which the structure bound OH groups released. The formation of high temperature phases was enhanced with the ground samples. For the ground talc sample the crystallization of non-crystalline phase into orthorhombic enstatite was observed in the range of 800°C. For ground pyrophyllite a certain agglomeration of grains was observed in the range above 950°C. Moreover, for both clays the ETA characterized a closing up of subsurface irregularities caused by grinding as a decrease of the emanation rate in the range 250–400°C. The comparison of thermal analysis results with the results of other methods made it possible to better understand the effect of grinding on the ceramic clays.

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Authors and Affiliations

  1. Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, Rez, Czech Republic, 250 68

    V. Balek & Z. Černý

  2. Institute of Materials Sciences, CSIC-University of Sevilla, Sevilla, Spain, 41092, c. Americo Vespucio s/n

    L. A. Pérez-Maqueda, J. Poyato, V. Ramírez-Valle & J. L. Pérez-Rodríguez

  3. Chemical Faculty, Moscow State University, Moscow, Russia, 199234

    I. M. Buntseva

Authors
  1. V. Balek
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  2. L. A. Pérez-Maqueda
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  3. J. Poyato
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  4. Z. Černý
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  5. V. Ramírez-Valle
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  6. I. M. Buntseva
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  7. J. L. Pérez-Rodríguez
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Correspondence to V. Balek.

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Balek, V., Pérez-Maqueda, L.A., Poyato, J. et al. Effect of grinding on thermal reactivity of ceramic clay minerals. J Therm Anal Calorim 88, 87–91 (2007). https://doi.org/10.1007/s10973-006-8093-1

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  • DOI: https://doi.org/10.1007/s10973-006-8093-1

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