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The Influence of the Activity of Water on the Phase Composition of Aluminum Hydroxides Formed by Reaction of Amalgamated Aluminum with Water

Published online by Cambridge University Press:  01 July 2024

O. Lahodny-Šarc ,
Z. Dragčević  and
D. Došen-Šver
O. Lahodny-Šarc
Affiliation:
Mining, Geology and Petroleum Engineering Department, University of Zagreb, Yugoslavia
Z. Dragčević
Affiliation:
Technological Department, University of Zagreb, Yugoslavia
D. Došen-Šver
Affiliation:
Technological Department, University of Zagreb, Yugoslavia
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Abstract

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The influence of the activity of water on the phase composition of aluminum hydroxides obtained by reaction of amalgamated aluminum with water has been studied. The reaction was carried out in solutions of water and dioxane, and in sodium chloride solutions of different concentrations; amorphous aluminum hydroxide was precipitated initially. The aging of this primary product to bayerite, pseudoboehmite, or an amorphous gel was controlled by the water content of the system. The pseudoboehmite has shown a significant reactivity when used as a source of alumina in the hydrothermal syntheses of kaolinite at relatively low temperature and pressure.

Резюме

Резюме

Изучалось влияние активности воды на фазовый состав гидроокисей алюминия по результатам реакции амальгамированного алюминия с водой. Реакция проводилась в растворах воды и диоксана и растворах хлористого натрия различной концентрации. Первоначально осаждалась аморфная гидроокись алюминия. Созревание этого первичного продукта до стадии бейерита, псевдобемита или аморфного геля контролировалось по содержанию воды в системе. Псевдобемит показал значительную реактивность при использовании в качестве источника алюминия в гидротермальном синтезе каолинита при относительно низких температуре и давлении.

Kurzreferat

Kurzreferat

Der Einfluß der Aktivität des Wassers auf die Phasenzusammenstellung von Aluminiumhydroxyden, welche durch Reaktion von amalgamiertem Aluminium mit Wasser erhalten wurden, ist untersucht worden. Die Reaktion wurde in Wasser-und Dioxanlösungen und in Natriumchloridlösungen,verschiedener Konzentrationen, ausgeführt. Das Aluminiumhydroxyd, welches zuerst ausfällt, ist amorph. Das Altern dieses primären Produkts zu Bayerit, Pseudoboehmit oder einem amorphen Gel wurde durch den Wassergehalt des Systems kontrolliert. Pseudoboehmit zeigte eine erhebliche Reaktivität, wenn es als Ausgangsmaterial für Alumina in der hydrothermalen Synthese von Kaoliniten bei relativer niedriger Temperatur und Druck benutzt wurde.

Keywords

AluminaAluminumBayeriteHydroxidePseudoboehmiteWater
Type
Research Article
Information
Clays and Clay Minerals , Volume 26 , Issue 2 , April 1978 , pp. 153 - 159
Copyright
Copyright © 1978, The Clay Minerals Society

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