Abstract
In this study, an attempt was made to synthesize hydrogrossular, a group of garnet minerals, under hydrothermal conditions at temperatures below 180°C, using coal ash, which is the solid waste from thermal power plants, as a starting material. A single phase corresponding to hydrogrossular was found at around 120°C, and the hydrogrossular coexisted with 11-A tobermorite above 140°C. The hydrogrossular phase decreased with increasing reaction temperature, while that of 11-A tobermorite increased concurrently. The physicochemical properties of the hydrogrossular obtained from the hydrothermal synthesis was characterized by X-ray diffraction thermogravimetry/differential thermal, analysis, scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray fluorescence spectroscopy.
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