A comparative study using two methods to produce zeolites from fly ash

By A. Molina, C. Poole. 2004

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Study of the adsorption of Cd (II) from aqueous solution using zeolite-based geopolymer, synthesized from coal fly ash; kinetic, isotherm and thermodynamic studies (2015, methodology): “Recently, a new process has been proposed by the name of fusion method as it adds an alkaline fusion stage before the conventional zelite synthesis process [Molina and Poole, 2004; Querol et al., 2002].”
An XRD Study of the Effect of the SiO2/Na2O Ratio on the Alkali Activation of Fly Ash (2007, background): “Rietveld quantitative analysis reveals that the crystalline phases in the initial ash (quartz, mullite, magnetite) are not as inalterable as the findings of prior studies [24,29,30], but rather undergo minor alterations during the activation process.”
Removal of ammonium from aqueous solutions using zeolite synthesized from fly ash by a fusion method (2011, methodology): “Previous studies have also shown that zeolite synthesized from fly ash using this method has higher crystallinity and cation exchange capacity (CEC) compared to zeolite synthesized using the conventional hydrothermal method [20].”