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Hydrothermal synthesis of smectite from dickite

Published online by Cambridge University Press:  01 January 2024

Kyoung-Won Ryu*
Affiliation:
Department of Earth and Environmental Sciences, Chungbuk University, Cheongju 361-763, Korea
Young-Nam Jang
Affiliation:
Korea Institute of Geoscience and Mineral Resources, Minerals and Materials Processing Division, Daejeon 305-350, Korea
Soo-Chun Chae
Affiliation:
Korea Institute of Geoscience and Mineral Resources, Minerals and Materials Processing Division, Daejeon 305-350, Korea
In-Kook Bae
Affiliation:
Korea Institute of Geoscience and Mineral Resources, Minerals and Materials Processing Division, Daejeon 305-350, Korea
Sang-Hoon Choi
Affiliation:
Department of Earth and Environmental Sciences, Chungbuk University, Cheongju 361-763, Korea
*
*E-mail address of corresponding author: crystal@rock25t.kigam.re.kr

Abstract

Dioctahedral smectite was prepared hydrothermally from dickite [Al2Si2O5(OH)4] as a starting material by autoclaving in a closed stainless steel vessel with variable temperature, pressure, time and pH conditions. Highly crystalline smectite can be obtained at 290°C under a pressure of 69 bar for 48 h. The pH of the solution was an important factor and should be maintained at 10 to 11 for the successful formation of smectite. Characterization by X-ray powder diffraction, scanning electron microscopy, infrared spectroscopy, thermogravimetric analysis, differential thermal analysis and the Greene-Kelly test showed that the smectite synthesized was Na-beidellite, mostly because of the heat treatment of the starting material and the stoichiometric batch composition.

Type
Research Article
Copyright
Copyright © 2006, The Clay Minerals Society

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