Síntese Hidrotérmica de Zeólitas a Partir de Cinza Volante

Abstract

Fly ash, an industrial waste from coal combustion, was used as raw material for the hydrothermal synthesis of zeolites. The study investigated various experimental conditions, including reagent concentration (NaOH and Na₂CO₃), temperature, reaction time, and synthesis methods (classic and two-phase). The results showed the formation of hydroxysodalite and cancrinite, with the two-phase method at high NaOH concentration (5 M) proving more efficient, promoting quartz destruction and enhancing zeolite crystallization. The presence of calcite in the ash influenced cancrinite formation. The work contributes to the valorization of industrial waste and environmental impact reduction.