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OPTIMIZATION OF THE HEAT-TREATMENT REGIME OF A SINTERED GLASS-CERAMIC FROM MSWI BOTTOM ASH
Abstract
The aim of this work is the optimization of sinter-crystallization regime of a glassceramic from a municipal solid waste incineratior (MSWI) bottom ash. The parent waste was melted at 1400oC, milled below 75 $\mu$m and the obtained glass powders were pressed at 100 MPa. The optimal temperature for sinter-crystallization was estimated by DTA, dilatometry and XRD. Subsequently, the degrees of sintering, obtained at different heating rates (between 2 and 40oC/min) and 1 h step at 950oC were estimated by the linear shrinkage and water absorption. Using precise density measurements with gas pycnometer, the open and closed porosities in samples were also evaluated. The structure of glass-ceramics, obtained at low and high heating rates, were observed by SEM and compared. It was demonstrated that samples with no deformation, zero water soaking and good crystallinity can be obtained at high heating rate of 40oC/min. This gives a possibility to apply short and cost-effective heat-treatment regimes.
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References7
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