Effect Of Crystallization Time On Behaviors Of Glass-Ceramic Produced From Sludge Incineration Ash

Incineration has become a significant treatment method for municipal sewage sludge because of the rising difficulty to find suitable sites for traditional landfill. However, a large amount of sludge incineration ash containing high levels of heavy metals is remained. In order to achieve resource utilization, glass-ceramics have been produced using sludge incineration ash. The optimum heat treatment was identified as T-n = 837 degrees C for 1.0 h and T-c = 977 degrees C for 2.0 h, respectively. The major crystalline phase identified from X-ray diffraction (XRD) and scanning electron microscopy (SEM) was wollastonite (CaSiO3) and the products displayed good performances. The results indicated that it was a feasible attempt to produce glass-ceramics from sludge incineration ash as decorative materials. (C) 2013 The Authors. Published by Elsevier B.V.