other reactors favor production on a larger scale. Although an
undesirable alkali attack on the glass reactor can occur, significant
contamination of the reagent solution was not observed after the
completion of the reaction.
3.2.1. Analysis of the post-synthesis alkaline solution
Over time (2–3 weeks), post-synthesis solutions stored at
ambient temperature showed the formation of precipitates identified
as Na-P1 (SEM), indicating the presence of significant amounts
of residual Si and Al in these solutions. Some of the post-synthesis
extracts analyzed (Table 5) exhibited high Si content, accounting
for up to 30% of the initial available mass of this element in the
ash displayed in Table 1. The lower levels recorded for aluminum
(0.2–1.5%) were expected given its lower solubilization and greater
consumption in zeolitization. This result points to the possible
reuse of these alkaline solutions in the zeolitization process,
improving the conversion efficiency of ash and minimizing the volume
of wastewater to be treated.