Variation of Silicon Aluminium Ratio SAR

In contrast, Table 5.37 also exhibits an increase in Si02 in some of the residues (i.e., ALA2 to ALA6) of the hopper ash, as compared to the lagoon ash. Also, AI2O3 has been noticed to be on the higher side, as compared to the OLA, in these samples except for ALAI. 

However, such an increase in the oxides in the residues of OLA is unexpected and could not be substantiated, as neither Si02 nor AI2O3 were added externally. 

the present generation researchers focus should be on an extensive future study to explore, the chemistry involved in such process. 

Furthermore, it can be inferred that the increase in AI2O3 and decrease in Si02 in the ALA samples contributes to a significant lowering of their SAR up to 1.26 (refer Table 5.37). Also, a decrease in the SAR of the ALA samples with an increase in the 

Incidentally, these zeolites have been identified from the XRD diffractograms of the samples, as presented in Table 5.38. The mineralogical phase transition in the activated residues also reveals the higher zeolitization characteristics of the OHA for synthesizing a class of zeolites with a slightly higher SAR value (2.64 SAR 1.60), which is in close proximity to common fly ash zeolites, Faujasite and Analcime [47]. 

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