M. Romero et al., Development of a new glass-ceramic by means of controlled vitrification and crystallisation of inorganic wastes from urban incineration, J EUR CERAM, 19(12), 1999, pp. 2049-2058
This paper reports the results of a study of the feasibility of recycling t
he solid residues from domiciliary waste incineration by producing a glass-
ceramic. The major components of the raw material (TIRME F + L), which was
from a Spanish domiciliary incinerator, were CaO, SiO2 and Al2O3 but nuclea
ting agents, such as TiO2, P2O5, and Fe2O3 were also present in reasonable
amounts. It was found that a relatively stable glass with suitable viscosit
y could be obtained by mixing 65 wt% TIRME F + L with 35 wt% glass cullet.
The heat treatment required to crystallise the glass produced from this mix
ture, designated TIR65, was nucleation at 560 degrees C for 35 min followed
by crystal growth at 100 degrees C for 120 min. The resulting glass-cerami
c contained a number of crystalline phases, the most stable being clinoenst
atite (MgSiO3), or perhaps a pyroxenic phase which incorporates Ca, Mg and
Al in its composition, and akermanite (Ca2MgSi2O7). The microstructure cont
ained both fibre-like and dendritic crystals. The mechanical properties wer
e acceptable for applications such as riles for the building industry. (C)
1999 Published by Elsevier Science Limited. All rights reserved.