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

Published online by Cambridge University Press:  05 July 2018

A. Croce ,
M. Allegrina ,
P. Trivero ,
C. Rinaudo ,
A. Viani ,
S. Pollastri  and
A. F. Gualtieri
A. Croce
Affiliation:
Dipartimento di Scienze e Innovazione Tecnologica, Universitá del Piemonte Orientale “Amedeo Avogadro”, Viale Teresa Michel 11, I-15121 Alessandria, Italy
M. Allegrina
Affiliation:
Dipartimento di Scienze e Innovazione Tecnologica, Universitá del Piemonte Orientale “Amedeo Avogadro”, Viale Teresa Michel 11, I-15121 Alessandria, Italy
P. Trivero
Affiliation:
Dipartimento di Scienze e Innovazione Tecnologica, Universitá del Piemonte Orientale “Amedeo Avogadro”, Viale Teresa Michel 11, I-15121 Alessandria, Italy
C. Rinaudo
Affiliation:
Dipartimento di Scienze e Innovazione Tecnologica, Universitá del Piemonte Orientale “Amedeo Avogadro”, Viale Teresa Michel 11, I-15121 Alessandria, Italy
A. Viani
Affiliation:
Institute of Theoretical and Applied Mechanics ASCR, Prague, Czech Republic Centre of Excellence Telč, Batelovská 485-6, CZ- 58856 Telč, Czech Republic
S. Pollastri
Affiliation:
Dipartimento di Scienze Chimiche e Geologiche, Universitaá di Modena e Reggio Emilia, Via Sant’Eufemia 19, I-41121 Modena, Italy
A. F. Gualtieri*
Affiliation:
Dipartimento di Scienze Chimiche e Geologiche, Universitaá di Modena e Reggio Emilia, Via Sant’Eufemia 19, I-41121 Modena, Italy
*
* E-mail: alessandro.gualtieri@unimore.it
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Abstract

Selected samples of asbestos-containing material (ACM) with different Ca/Si ratios have been treated thermally at 1200°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, a˚kermanite and merwinite.

The identification of such mineral assemblages was inspired by the close inspection of a natural counterpart, the high-temperature contact metamorphic imprint due to the intrusion of a sill into carbonate rocks. The process turned out to occur largely at the solid state and involved substantial mobilization of Ca and Mg to form a spinel phase (namely MgFe2O4) which was recognized in the matrix and within, or close to elongated morphologies.

Keywords

end of wastesecondary raw materialcement-asbestosthermal transformation
Type
Research Article
Information
Mineralogical Magazine , Volume 78 , Issue 5 , October 2014 , pp. 1177 - 1191
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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