Recycling of COSMOS inert into sintered glass-ceramics


Glass-ceramics, i.e. the most established waste-derived glass- based products, may be obtained even avoiding an expensive vitrification step, by direct sintering of inorganic waste mixed with recycled glass powder. 

COSMOS inert, due to its formulation, will be basically intended as an alternative source for CaO, together with an inert fraction: optimized formulations actually led to lightweight glass-ceramics possessing microstructural homogene- ity and high specific mechanical properties, to be used as low cost building material, with no negative impact on the chemical stability already achieved with COSMOS.

Lightweight construction materials may be manufactured at relatively low temperature (1050 C) using a mixture of waste materials instead of valuable raw materials. In particular, the recently developed glass-ceramic materials demonstrate the possibility to reuse significant amounts of COSMOS, i.e. fly ash from MSWI, subjected to a preliminary stabilization treatment. The mineralogy of COSMOS was exploited here in combination with recycled glass and clay for the development of uniform cellular structures, as well as for partial crystallization, owing to glass/waste interactions.

According to leaching tests, realised on the obtained materials, and cytotoxicity evaluation by cell culture, the glass-ceramic was safe and not toxic after 24 h, showing similar behaviour to the reference soda-lime glass (considered as a safe product).



Ines Ponsot a, Enrico Bernardo a, *, Elza Bontempi b, 1, Laura Depero b, Rainer Detsch c, Rama Krishna Chinnam c, Aldo Roberto Boccaccini c, *

a Department of Industrial Engineering, University of Padova, 35131, Padova, Italy
b INSTM and Department of Mechanical and Industrial Engineering, University of Brescia, Via Branze 38, Brescia, Italy
c Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, 91058, Erlangen, Germany

Journal of Cleaner Production 89 (2015) 224e230


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