Phase transition process in the hydrothermal zeolitization of volcanic ashes into LTA and FAU structures
- Monzon, Jorge Daniel
- González, Maximiliano
- Muñoz, Mercedes
- Pereyra, Andrea Marisa
- Basaldella, Elena Isabel
DOIAbstract
Minerals such as quartz, present widely in various volcanic ashes, remain unaltered throughout the low-temperature hydrothermal process currently used in industry to obtain zeolites, causing an incomplete hydrothermal transformation of the starting solid. This study presents a novel and cost-effective procedure which improves the reactivity of ash toward the generation of zeolite by increasing the availability of silica and alumina components. This method leads to a final product with a large zeolite content. The transformation consisted of an ash-activation step followed by hydrothermal zeolitization. The influence of the structural, chemical, and morphological characteristics of the volcanic ash as well as the effect of the activation pro...
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