In this research work, the mass (%) reduction of Fe2O3 in kaolin samples was achieved using various methods including mechanical, thermal, and chemical methods. Iron compounds were reduced from the sample by reacting with hydrochloric acid at certain temperatures. The samples were weighed and analyzed after each process using elemental analysis (EDX). In this process, maintaining the ratio of SiO2 and Al2O3 was focused. After reducing the mass (%) of iron compounds content from the sample, the sample was processed in the hydrothermal reactor with Ca(OH)2 and left in a drying cabinet for different periods of time from 72 to 96 hours. After the reaction time, it was cooled to room temperature at ± 5 °C every 1 hour. Powder X-ray diffraction (XRD) was taken and analyzed to determine the phases and crystallinity.
