Crystal Structure and Thermal Behaviour of Calcium Monosilicate Derived from Calcined Chicken Eggshell and Rice Husk Ash

Abstract

This study focuses on the synthesis of synthetic calcium monosilicate ceramic from chicken eggshells and rice husks waste through the mechanochemical route that relatively straightforward without adding any binders. Synthetic calcium monosilicate was mixed using a 1:1 ratio of calcined eggshell and rice husk ash, which both materials known as rich in calcium oxide and silica sources, respectively. The mixed powder was pressed using uniaxial pressing before fired at 1100°C, 1150°C, 1200°C, 1250°C, and 1300°C for 120 minutes with a heating rate of 5°C/min. The XRD spectrum from 1100°C to 1200°C mainly consists of pseudowollastonite (ICSD: 98-005-2576), wollastonite and silicon dioxide phases. However, as the sintering temperature increases, the wollastonite phases was completely transformed into pseudowollastonite, leaving some unreacted silica.

Combined Potential of Quarry Waste Fines and Eggshells for the Hydrothermal Synthesis of Tobermorite at Varying Cement Content

“…Another endothermic fluctuation along with a sharp drop in mass of approximately −24.76 mg is observed at 849.82 • C which indicates the decomposition of CaCO 3 . These results agree with the findings of existing studies in which the TGA-DTA patterns appear relatively similar to this current study, indicating that all major reactions took place in and around the same temperature levels [64,68,69]. Similar to the TGA-DTA analysis of QWF, this result is important since this further confirms the mineral composition of ESP.…”

Combined Potential of Quarry Waste Fines and Eggshells for the Hydrothermal Synthesis of Tobermorite at Varying Cement Content

“…Another endothermic fluctuation along with a sharp drop of mass of approximately -24.76 mg is observed at 849.82°C which indicates the decomposition of CaCO3. These results agree with the findings of existing studies in which the TGA-DTA patterns appear relatively similar to this current study indicating that all major reactions took place in and around the same temperature levels [67,71,72]. Similar to the TGA-DTA analysis of QWF, this result is important since this further confirms the mineral composition of ESP, in this case, the CaCO3.…”