Abstract
The synthesis of zeolitic phases from mullite, the main component of fly ash generated during burning coal, has been investigated. Thermodynamic analysis is performed in order to assess required temperatures and concentrations for the synthesis, as well as to determine the thermodynamically more stable species. X-Ray Diffraction (XRD) analyses show different zeolitic phases to be crystallized as product of the hydrothermal processing. The thermodynamic values calculated in this study proved similar to the experimental results and of other authors, and enabled the definition of the regions of stability for the species in the reactional environment. The experimental results, combined with the analysis of these diagrams, show that the stability of species to be formed during the hydrothermal treatment of coal ash are strongly dependent on temperature and NaOH concentration. The increase of both factors, however, drives the reaction towards less noble products, particularly hydroxycancrinite
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