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Solubility Diagrams for Explaining Zone Sequences in Bauxite, Kaolin and Pyrophyllite-Diaspore Deposits

Published online by Cambridge University Press:  01 July 2024

Yoshiro Tsuzuki
Yoshiro Tsuzuki*
Affiliation:
Department of Earth Sciences, Faculty of Science, Nagoya University, Chikusa-ku, Nagoya, Japan
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Abstract

Solubility diagrams defined by log [Al3+] and log [H4SiO4] are given for hydrous alumina or aluminum silicate minerals which appear in bauxite, kaolin and pyrophyllite-diapore deposits. They are constructed based on thermodynamic data of relevant reactions both at the room temperature and at elevated temperatures.

An aqueous solution reacts to a mineral, in this case K-feldspar, and, by dissolving it, becomes saturated with respect to a certain mineral. This mineral begins to be precipitated and the solution changes its composition as a result of the precipitation as well as further dissolution of the original mineral. Then, it attains saturation with respect to another mineral, which is precipitated thereafter. Thus, different minerals are precipitated in turn.

The sequences of precipitation of minerals can be shown on the diagrams under different conditions. A sequence, aluminum hydroxide → kaolinite or pyrophyllite → silica mineral plus kaolinite or pyrophyllite is expected in a weakly acid solution. In contrast, a sequence, silica mineral → silica mineral plus kaolinite or pyrophyllite is expected in a strongly acid solution. The possibility of application of the sequence of precipitation thus expected to alteration zoning is also discussed.

Type
Research Article
Information
Clays and Clay Minerals , Volume 24 , Issue 6 , December 1976 , pp. 297 - 302
Copyright
Copyright © 1976 The Clay Minerals Society

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