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3 results

  • The Effect of Mechanical Treatment on the Crystal Structure and Thermal Behavior of Kaolinite

  • Éva Kristóf, A. Zoltán Juhász, István Vassányi
  • Journal:
    Clays and Clay Minerals / Volume 41 / Issue 5 / October 1993
    Published online by Cambridge University Press:
    28 February 2024, pp. 608-612
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  • The destruction of the crystal structure of kaolinite caused by mechanical forces was investigated by X-ray diffraction, thermal analysis, infrared spectroscopy, and specific surface area determination. Attention was also directed to the change of thermal reactions of milled kaolinite. Grinding experiments for 5 min, 10 min, and 1, 2, 4, 6, and 10 h were carried out in an AGO I planetary mill. After 1 h of grinding, the crystalline order of kaolin is destroyed; but the amorphization continues in the course of prolonged grinding. Grinding for 1 h produces a favorable state for forming mullite-type crystals after heating even at 1000°C.