Comparison of the properties of glass, glass-ceramic and ceramic materials produced from coal fly ash.
Glass, glass-ceramic and ceramic materials were produced from thermal power plant fly ash without any additives. X-ray diffraction (XRD) analysis revealed the amorphous phase of the glass sample. Augite phase was detected in the glass-ceramic sample, while the enstatite and mullite phases occurred in the ceramic samples. Scanning electron microscopy (SEM) investigations showed that tiny crystallites homogeneously dispersed in the microstructure of the glass-ceramic sample and elongated crystals formed in the ceramic samples. Density values of the obtained samples are comparable to those of the commercially produced glass, glass-ceramic and ceramic samples. Toxicity characteristic leaching procedure (TCLP) results indicated that the produced samples could be taken as non-hazardous materials. Produced samples showed high resistance to alkali solutions in contrast to acidic solutions. Microstructural, physical, chemical and mechanical properties of the produced glass-ceramic samples are better than those of the produced glass and ceramic samples.
Erol
M
M
Department of Chemical Engineering, Chemical & Metallurgical Engineering Faculty, Istanbul Technical University, Maslak, Istanbul, Turkey. erolm@itu.edu.tr
Küçükbayrak
S
S
Ersoy-Meriçboyu
A
A
D002244:Carbon / Q000032:analysis / Q000737:chemistry*; D002516:Ceramics; D003031:Coal; D060729:Coal Ash; D005898:Glass; D019216:Metals, Heavy / Q000032:analysis / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D052638:Particulate Matter / Q000032:analysis / Q000737:chemistry*; D011210:Power Plants; D014961:X-Ray Diffraction
D003031:Coal; D060729:Coal Ash; D019216:Metals, Heavy; D052638:Particulate Matter; D002244:Carbon