Synthesis of Zeolites from Fly Ash in a Pilot Plant Scale. Examples of Potential Environmental Applications

Abstract

The compositional similarity of fly ash to some volcanic material, precursor of natural zeolites, was the main reason to experiment the synthesis of zeolites from this waste material by Holler and Wrishing. Since this initial studies, many patents and technical articles have proposed different methods for the synthesize this mineral from fly ash, and different applications of the zeolitic product. Although all these methods are based on an hydrothermal alkaline conversion of fly ash, the following types of processes may be used: