Characteristics of Fusion Temperature of Fly Ashes Generated by the Combustion of Tobacco Rod and Lignite

Fly ashes, as a type of solid wastes, has been widely recycled recently. Its characteristic is directly related to the temperature of the hearth in which it has been heated. The constituents and forms of the fly ashes may vary in the specific reaction atmosphere and temperature. In this paper, the X-ray diffraction (Xrd) and the scanning electron microscope (SEM) were applied to observe the mineral form and crystal components of the fly ashes generated by the combustion of tobacco rod and lignite. The results showed that: the fusion temperature of the fly ashes rised with the increase of the CaO content and the fusion temperature of the fly ashes in the oxidation atmosphere was about 50°C higher than that in the reducing atmosphere. Through the entire process, the fusion temperature of the fly ashes initially rises with the increase in the percentage of the residual carbon, then decreases and in the end it levels off. The results from this research work can be used as the guidelines for the reutilization of fly ashes in industrial production.