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Conversion to glass-ceramics from glasses made by MSW incinerator fly ash for recycling.
- Source :
-
Ceramics International . Sep2002, Vol. 28 Issue 6, p689. 6p. - Publication Year :
- 2002
-
Abstract
- Glasses were made using fly ash from municipal solid waste (MSW) incinerators with the addition of SiO2, MgO and TiO2. The glasses were then converted to glass-ceramics for further recycling to construction materials. The optimum heat-treatment schedule for the ceramitization of glasses was 720 °C for 90 min for nucleation and 870 °C for 10 h for crystal growth. Diopside (CaMgSi2O6) was formed as a major crystalline phase. The glass-ceramics showed good mechanical properties with a hardness of 6,730 MPa, fracture toughness of 1.86 Mpa m1/2 and bending strength of 127 MPa. Glasses and glass-ceramics with a composition of 20SiO2–5MgO–75fly ash–2TiO2 (all given in wt.%) showed an excellent resistance against leaching of heavy metal ions in water. The amount of heavy metal ions leached after 18 h at 23 °C was well below regulation with Cd2+ <0.04 ppm, Cr3+ <0.004 ppm, Cu2+ <0.03 ppm and Pb2+ <0.15 ppm, respectively. [Copyright &y& Elsevier]
- Subjects :
- *CERAMICS
*INCINERATORS
*WASTE recycling
Subjects
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 28
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 8777059
- Full Text :
- https://doi.org/10.1016/S0272-8842(02)00030-5