A Conceptual Model for Step Wise Purification ofFAZ

2 A Conceptual Model for Step Wise Purification ofFAZ 

As zeolitization of fly ash is a complex phenomenon. Fig. 6.18 intends to simplify complex effects of successive activations of the fly ash, in three-steps. In such a situation, grinding of a residue, may cause peeling off and crumbling the deposited crystals of the FAZ (refer Fig. 6.14) and thus exposes the roughened boundary of impurities, IMP from Step-1 and Step-2. In fact, the activated boundary contains many nano-sized pores, as observed in Fig. 6.14b-g, which 

6 Major Findings of the Three-Step Activation Technique 

18 A eoneeptual model of the process to explain step wise purification of the fly ash zeohtes (FAZ) by hydrothermal treatment of fly ash (HTF), where black dots, hexagons, deep black ovals, white inner most portion and white regular shapes, IMP represent glass. Quartz, Mullite, hollow core of the RFA, FAZ and activated remains of the fly ash particles as impurities, respectively 

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