Utilization of coal fly ash in the glass–ceramic production

Abstract

Manufacturing the glass–ceramic has been proposed as a useful choice to recycle coal fly ash from power plants. In this work, a glass–ceramic of SiO 2–Al 2O 3–Fe 2O 3–CaO family was synthesized by mixing 90 wt% of coal fly ash, from a power plant in west of China, with Na 2O, and then melted at 1350 °C. The ceramization of the obtained glass was carried out at 770 °C for 2 h. Esseneite and nepheline were found present as major crystal phases. The produced glass–ceramic exhibited good chemical durability as well as good mechanical properties. The toxicity characteristic leaching procedure (TCLP) method found that the glass–ceramic was non-hazardous.