Abstract
This study investigated the characterization and microstructure observation of sintered red mud–fly ash mixtures at various elevated temperature. The detailed analysis of the phase evolution during sintering process of red mud and fly ash as the function of sintering temperature were explored. Phase evolution and microstructure observation were carried out by X-ray diffraction method (XRD) and scanning electron microscope (SEM) method. Thermal analysis was carried out by thermogravimetric and differential thermal (TG-DTA) analysis. The mineralogical evolution revealed that quartz and goethite originates from the parent composition of red mud and fly ash. Microstructure observation revealed the transformation of globular grains towards elongated grains during the sintering process. Mass loss around 11% is observed in the thermal analysis patterns due to the dehydration, hydroxide-oxide phase transitions from iron (primary phase) and aluminum (secondary phase). The phase transition, evolution and dissolution as the function of sintering temperature were correlated as the function of temperature and the amount of fly ash content. The disappearance and appearance of the different phases confirms the decomposition and formation reaction suggested by thermal analysis.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
