Ying-Chieh Lee, Huei-Jyun Shih, Endrika Widyastuti
An innovative technology has developed to synthesize renewable feldspar from coal fly ash and oyster shells. This study investigated the influence of additions of fly ash and calcination temperatures on the phase structures, microstructure, chemical composition, and particle size distribution of renewable feldspar. Oyster shells react with fly ash during heat treatment, promoting the formation of primary phase Ca2Al2SiO7 in renewable feldspar. The effects of various additions of fly ash on the phase structure, microstructure of the resulting renewable feldspar were investigated. Notably, the renewable feldspar incorporating 40 % fly ash exhibited a density of 2.68 g/cm3, a compressive strength of 288 MPa, and a Mohs hardness of 6. The findings suggest that renewable feldspar can be used as a bright ceramic glaze material, offering an innovative technology that generates valuable materials, enhances the economic value of waste products, and contributes to resource recycling and environmental protection. © 2025
Institute of Precision Electronic Components, National Sun Yat-Sen University, Kaohsiung, 804, Taiwan; Department of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung, 804, Taiwan; Department of Agricultural Product Technology, Faculty of Agricultural Technology, Universitas Brawijaya, Malang, 65145, Indonesia
