The concept of 'end of waste' and recycling of hazardous materials: in depth characterization of the product of thermal transformation of cement-asbestos

0452505 - ÚTAM 2016 RIV GB eng J - Článek v odborném periodiku
Croce, A. - Allegrina, M. - Trivero, P. - Rinaudo, C. - Viani, Alberto - Pollastri, S. - Gualtieri, A. F.
The concept of 'end of waste' and recycling of hazardous materials: in depth characterization of the product of thermal transformation of cement-asbestos.
Mineralogical Magazine. Roč. 78, č. 5 (2014), s. 1177-1191. ISSN 0026-461X. E-ISSN 1471-8022
Grant CEP: GA MŠMT(CZ) LO1219
Klíčová slova: end of waste * secondary raw material * cement-asbestos * thermal transformation
Kód oboru RIV: JN - Stavebnictví
Impakt faktor: 2.026, rok: 2014
http://minmag.geoscienceworld.org/content/78/5/1177.abstract

Selected samples of asbestos-containing material (ACM) with different Ca/Si ratios have been treated thermally at 1200 degrees C for 15 min to obtain an `'end of waste geo-inspired material'. Before and after treatment, micro-Raman spectroscopy allowed the investigation of both powdered and massive samples by directing the laser beam onto crystals with elongated morphology, thin fibres and the matrix. In the raw samples, chrysotile and/or crocidolite were detected. After the thermal treatment, no asbestos phases were identified in the Raman spectra collected on fibrous or fibre-like morphologies. The scanning electron microscopy/energy dispersive spectroscopy investigations confirmed the onset of a pseudomorphic process during annealing, leading to the complete transformation of asbestos minerals into non-hazardous magnesium or calcium magnesium silicates such as forsterite, monticellite, akermanite and merwinite.
Trvalý link: http://hdl.handle.net/11104/0253512