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Parameters that influence silica dissolution in alkaline media

Abstract : Geopolymers have been the object of numerous studies because of their low environmental impact. The synthesis of these geomaterials is achieved by the alkaline activation of aluminosilicates. Alkaline activation is typically accomplished by the activation of potassium silicate or sodium silicate. These alkaline silicate solutions are relatively expensive. We thus attempted to create these solutions by the dissolution of potassium hydroxide and silica in water. This study focuses on the various parameters that can influence the dissolution of silica in basic media (pH>13). The samples used were amorphous silica, quartz sand and quartz ground to five different size distributions. The study of the dissolution of siliceous species was performed mainly by infrared spectroscopy by varying several factors. Stirring and solution volume played no significant role. However, the size distribution and crystallinity of silica were observed to significantly affect the kinetics of dissolution and the quantities of siliceous species in solution, which varied greatly according to the quantity of KOH introduced.
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Article dans une revue
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Contributeur : Sylvie Rossignol Connectez-vous pour contacter le contributeur
Soumis le : mercredi 23 juillet 2014 - 18:12:04
Dernière modification le : samedi 26 mars 2022 - 04:30:44


  • HAL Id : hal-01044614, version 1


Alexandre Autef, Emmanuel Joussein, G. Gasgnier, Sylvie Rossignol. Parameters that influence silica dissolution in alkaline media. Ceramic Engineering and Science Proceedings, 2013, 33 (10), pp.13. ⟨hal-01044614⟩



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