Crystallization evolution, microstructure and properties of sewage sludge-based glass-ceramics prepared by microwave heating

► A reactor is designed to prepare glass-ceramic from sewage sludge by microwave. ► Microwave process has reduced energy consumption for its low reaction temperature. ► Finer and uniform crystals are observed in microwave glass-ceramics. ► Improved properties of microwave glass-ceramics are found. ► We modeled the crystals growth in microwave field.