Chapter Six - Thermal Characterization of Fly Ash
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AbstractThermal characterization and use in ceramic tile making of fly ash is presented. Differential temperature analysis–thermogravimetric analysis analysis, elementary component variation, chemical component, radical component transformation, mineralogical component transformation, microstructure transfer, leaching toxicity and speciation transformation, as a function of temperature for fly ash, are provided. Use of fly ash in ceramic tile making is explored. 11 major elements in fly ash with contents over 1% and a sequence of O >Ca >Si >Cl >Al >Fe >Na >S >C >Mg are found in fly ash. Main elementary content and chemical component of the ash changes with increase of sintering temperature. It is inferred that heavy metals should be stabilized in the sintered fly ash due to generation of crystal and glass phases which constitute occluding body of these heavy metals. Microstructure of fly ash is strengthened with the increase of temperature, and porosity reduces. In addition, content of glass phases increases and particles are more closely cemented together as sintering temperature increases from 1000 to 1300°C, which is conducive to solidification of heavy metals. The leaching toxicity and speciation of heavy metals are also influenced by the increase of temperature.

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