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Book Chapter

The Hydrothermal Synthesis of Kaolinite Up to 350°C

By
O. Lahodny-Sarc
O. Lahodny-Sarc
University of Zagreb Pierotijeva 6 44100 Zagreb, Croatia
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Z. Dragcevic
Z. Dragcevic
University of Zagreb Pierotijeva 6 44100 Zagreb, Croatia
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W. D. Keller
W. D. Keller
University of Missouri-Columbia Columbia, MO 65211, USA
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Published:
January 01, 1993

Abstract

Hydrothermal synthesis of kaolinite using amorphous alumina and silica as a starting material has been studied in the temperature range from 250 to 350°C and the corresponding saturated water vapor pressure. The pH varied from 1 to 5, the time of treatment from 3 to 70 days, and the percentage of autoclave water from 36% to 72%. The aim of the work is to demonstrate the factors influencing synthesis and the conditions under which the best crystallized product can be obtained. It was found that pH 3, 300°C, and the time interval starting with 5 days produced the best ordered crystals. At higher temperatures (up to 350°C) pyrophyllite was formed along with kaolinite. At lower temperature or shorter time of treatment, poorly crystallized products appeared. The lowering of pH to the value of 1 and 2 with sulphuric acid resulted in formation of better crystallized kaolinite, but alunite was formed at the same time.

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Contents

Clay Minerals Society Special Publication

Kaolin Genesis and Utilization

Haydn H. Murray
Haydn H. Murray
Dept. of Geological Sciences Indiana University Bloomington, IN 47405
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Wayne M. Bundy
Wayne M. Bundy
3026 Chase Lane Bloomington, IN 47401
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Colin C. Harvey
Colin C. Harvey
Dept. of Geological Sciences Indiana University Bloomington, IN 47405
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Clay Minerals Society
Volume
1
ISBN electronic:
9781881208389
Publication date:
January 01, 1993

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