DBPapers

SINTERED MATERIALS FROM INCINERATOR SECONDARY RESIDUES

AUTHOR/S: B. DZHANTOV, B. RANGUELOV, E. KARAMANOVA, F. ANDREOLA, L. BARBIERI, A. KARAMANOV
Sunday 1 August 2010 by Libadmin2010

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 2, 941-948 pp

ABSTRACT

The possibility to obtain new eco-compatible building materials by milling, pressing
and direct sintering of secondary raw materials (SRM) derived from a
physical/mechanical treatment of municipal solid waste incinerator (MSWI) bottom
ashes is discussed. The chemical compositions and particle size distribution of used
SRM press powders were evaluated using XRF analysis and by laser granulometer,
respectively. The thermal and densification behaviours were studied by non-isothermal
DTA-TG and dilatometric techniques. The degrees of sintering, obtained at different
temperatures of heat-treatment in the rage 1020 – 1140oC, were defined by measuring
the linear shrinkage, the water absorption and the density variation (by gas pycnometer).
The formed crystal phases were evaluated with X-ray Diffraction (XRD). The structure
of the materials (surfaces and fractures) was observed by Scanning Electron Microscopy
(SEM). With respect to the traditional building ceramics the new materials are
characterised by totally different micro-structures and phase composition. The analysis
of our results highlights also that the studied compositions are characterized by narrow
sintering intervals, located between the solidus and liquidus temperatures of the main
crystal phases. High crystallinity of obtained specimens, small water absorption and
relatively low sintering temperatures can be considered as promising initial results to
obtain low-cost building materials with elevate mechanical properties from direct
densification of SRM from MSWI ashes

Keywords: industrial wastes, ceramics, sintering, crystallization

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