Utilization of coal fly ash in the glass–ceramic production

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 SiO2–Al2O3–Fe2O3–CaO family was synthesized by mixing 90wt% of coal fly ash, from a power plant in west of China, with Na2O, and then melted at 1350°C. The ceramization of the obtained glass was carried out at 770°C for 2h. 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. [Copyright &y& Elsevier]