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Clays and Clay Minerals; February 2006; v. 54; no. 1; p. 80-86; DOI: 10.1346/CCMN.2006.0540110
© 2006 Clay Minerals Society
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HYDROTHERMAL SYNTHESIS OF SMECTITE FROM DICKITE

Kyoung-Won Ryu1, Young-Nam Jang2, Soo-Chun Chae2, In-Kook Bae2 and Sang-Hoon Choi1

1 Department of Earth and Environmental Sciences, Chungbuk University, Cheongju 361-763, Korea
2 Korea Institute of Geoscience and Mineral Resources, Minerals and Materials Processing Division, Daejeon 305-350, Korea

* E-mail address of corresponding author: crystal{at}rock25t.kigam.re.kr

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.

Key Words: Beidellite • Greene-Kelly Test • Hydrothermal Synthesis • Smectite






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