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Comportement des ions aluminiques et de la silice en solution: Etude de la formation de la kaolinite

Published online by Cambridge University Press:  09 July 2018

P. Espiau
Affiliation:
Centre d'Etudes Phytosociologiques et Ecologiques L. Emberger, BP 5051, 34033 Montpellier Cedex
G. Pedro
Affiliation:
Station de Science du Sol, Centre National de la Recherche Agronomique, Route de St-Cyr, 78000 Versailles, France

Resume

L'intérêt porté à la synthèse de la kaolinite a été suscité par des préoccupations d'ordre pédologique, qui nous ont amenés à comparer les expériences réalisées en laboratoire aux situations naturelles considérées comme propices à la formation de la phyllite 1/1. Il apparaît essentiel, pour le succès des synthèses, de privilégier la formation d'ions hydroxylés monomères de Al, pouvant réagir avec l'acide orthosilicique. La neutralisation lente et partielle de solutions très diluées semble garantir ces conditions. Deux séries d'essais ont été entrepris. Les résultats expérimentaux tendent à démontrer la possibilité d'obtenir une précipitation de kaolinite à partir des ions en solution et par simple neutralisation. Le mécanisme proposé par Siffert (1962), mettant en jeu la formation d'éléments T-O, semble le plus probable. Ces éléments prendraient naissance par réaction de l'acide orthosilicique et de l'ion Al(OH)2+. Le rapprochement entre l'importance du rôle joué ici par ce monomère hydroxylé et la place qu'il occupe dans le schéma de dissolution établi par Sarazin (1979) peut permettre de comprendre que les néoformations de kaolinite correspondent à des sols relativement bien drainés.

Abstract

Abstract

Pedological considerations led us to study kaolinite synthesis and compare data from laboratory experiments with the processes occurring in a natural environment believed to be favourable to the formation of a 1/1 phyllite. In order to obtain successful syntheses, it was first considered necessary to study the formation of Al monomer hydroxylated ions which can react with orthosilicic acid. These conditions are best provided by the slow and partial neutralization of highly dilute solutions. Two series of tests were conducted. The results show that kaolinite precipitation can be obtained from ions in solution and simple neutralization. The process suggested by Siffert (1962) based on the formation of T-O elements is most likely involved. T-O elements are derived from the reaction between orthosilicic acid and the Al(OH)2+ion. When comparing the important role played here by this hydroxylated monomer with its function in the dissolution scheme determined by Sarazin (1979), it becomes clearer why neogenesis of kaolinite occurs in relatively well drained soils.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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