Formation process of kaolinite from amorphous calcium silicate and aluminum chloride

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概要

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• The formation process of kaolinite in the hydrothermal reaction of an amorphous calcium silicate with aluminum chloride was studied by XRD, IR. DTA-TG, TEM, and high-resolution solid state ^<29>Si-MAS/NMR. The amorphous calcium silicate prepared from diatomite and calcium hydroxide was hydrothermally treated with an aluminum chloride solution in a Teflon pressure vessel at 220℃ for a reaction period varying from 1 to 144h. As the first step of the reaction, the Q^2 state component of the starting material changed into an intermediate amorphous with the Q^3 state. The degree of silica-polycondensation of this state is identical to that of the intermedicate phase observed in the kaolinitization from the amorphous mixture of silica and alumina. The intermediate amorphous phase was then converted directly into the crystalline kaolinite with a platy shape (the Q^3 state), without forming a spherical kaolinite. The latter was observed in the reaction system started from an amorphous mixture of silica and alumina.

• 日本粘土学会の論文

著者

• MIYAWAKI Ritsuro

  Department of Geology and Paleontology, National Museum of Nature and Science

• Tomura Shinji

  Ceramic Technology Department National Industrial Research Institute Of Nagoya

• INUKAI Keiichi

  Ceramic Technology Department, National Industrial Research Institute of Nagoya

• Inukai Keiichi

  Ceramic Technology Department National Industrial Research Institute Of Nagoya

• MIYAWAKI RITSURO

  Ceramic Technology Department, National Industrial Research Institute of Nagoya

• OKAZAKI MASAHARU

  Chemistry Department, National Industrial Research Institute of Nagoya

• TORIYAMA Kazumi

  Ceramics Research Institute, National Institute for Advanced Industrial Science and Technology

• SHIBASAKI YASUO

  Ceramic Technology Department, National Industrial Research Institute of Nagoya

• OKAZAKI MASAHARU

  Radiation Research Department, Government Industrial Research Institute

• KAMORI MASANOBU

  Engineering Research Association for Artificial Clay, Government Industrial Research Institute, Nago

• Okazaki Masaharu

  Chemistry Department National Industrial Research Institute Of Nagoya

• Miyawaki R

  Department Of Geology And Paleontology National Museum Of Nature And Science

• Miyawaki Ritsuro

  Department Of Geology And Paleontology National Museum Of Nature And Science

• Toriyama K

  National Inst. For Advanced Industrial Sci. And Technol. Nagoya

• Toriyama Kazumi

  Ceramics Research Institute National Institute For Advanced Industrial Science And Technology

• Kamori M

  Toyo Denka Kogyo Co. Ltd. Kouchi Jpn

• TORIYAMA KAZUMI

  Ceramic Technology Department, Government Industrial Research Institute, Nagoya

• MIYAWAKI RITSURO

  Ceramic Technology Department National Industrial Research Institute of Nagoya

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