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Effects of the Structure of Silica-Alumina Gel on the Hydrothermal Synthesis of Kaolinite

Published online by Cambridge University Press:  28 February 2024

Shigeo Satokawa ,
Yasushi Osaki ,
Soichiro Samejima ,
Ritsuro Miyawaki ,
Shinji Tomura ,
Yasuo Shibasaki  and
Yoshiyuki Sugahara
Shigeo Satokawa*
Affiliation:
Engineering Research Association for Artificial Clay, National Industrial Research Institute of Nagoya, Kita, Nagoya 462, Japan
Yasushi Osaki
Affiliation:
Chemical Research Laboratory, Tosoh Corporation, Shin-nanyo, Yamaguchi 746, Japan
Soichiro Samejima
Affiliation:
Chemical Research Laboratory, Tosoh Corporation, Shin-nanyo, Yamaguchi 746, Japan
Ritsuro Miyawaki
Affiliation:
Ceramic Technology Department, National Industrial Research Institute of Nagoya, Kita, Nagoya 462, Japan
Shinji Tomura
Affiliation:
Ceramic Technology Department, National Industrial Research Institute of Nagoya, Kita, Nagoya 462, Japan
Yasuo Shibasaki
Affiliation:
Ceramic Technology Department, National Industrial Research Institute of Nagoya, Kita, Nagoya 462, Japan
Yoshiyuki Sugahara
Affiliation:
Department of Applied Chemistry, Waseda University, Ohkubo, Shinjuku, Tokyo 169, Japan
*
*Present address: Fundamental Technology Research Laboratory, Tokyo Gas Co., Ltd., Shibaura, Minato, Tokyo 105, Japan.
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Abstract

Kaolinite was hydrothermally synthesized from two kinds of silica-alumina gels to examine the effect of the structure of the starting material. Two kinds of gels were prepared by precipitation at different pH conditions (pH = 9.6 and 4.2) from solutions containing water glass and aluminum sulfate. Na ions in the gels were removed with a resin before the hydrothermal treatment, but a slight amount of sulfate ions was still present in the gels. The nuclear magnetic resonance spectra of the starting gels suggested that the gel prepared at pH 9.6 consists of networks with alternating SiO4- and A1O4-tetrahedra (partially AlO6-octahedra), whereas the gel prepared at pH 4.2 consists of a sheet structure related to allophane. After the hydrothermal treatment at 220°C for 9 days, kaolinite particles with spherical shape were obtained from the former gel, and platy kaolinite was crystallized from the latter one. The difference in morphology of synthetic kaolinite was attributable to the structures of the starting gels, and the pH values in the hydrothermal reactions were not very significant to the morphology.

Keywords

Gel structureHydrothermal synthesisKaoliniteNuclear magnetic resonanceSilica-alumina gel
Type
Research Article
Information
Clays and Clay Minerals , Volume 42 , Issue 3 , June 1994 , pp. 288 - 297
Copyright
Copyright © 1994, Clay Minerals Society

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