Production Of Artificial Aggregates From
Ceramic Processing Of Municipal
Incinerator Fly Ash
Author(s)
G. De Casa, T. Mangialardi & L. Piga
Abstract
Municipal Solid Waste (MSW) incinerator fly ash was processed to form new
ceramic materials using conventional ceramic processing technology (dry
milling, powder compaction and sintering). A preliminary washing step of raw
fly ash with water was used to improve the chemical composition of this
material. The effects of particle size distribution, powder compaction pressure,
and sintering temperature and time on the physical and mechanical properties
and leaching behaviour of sintered products were investigated. It was found that
a washing step followed by a milling step is able to transform raw fly ash into a
material with consistent chemical and physical characteristics for its thermal
processing. With such a pretreatment it is possible to reduce the power input of
the sintering process (temperature reduction from 1210 to 1140°C) and to
manufacture sintered products that are characterised by high density (2.65-2.80
g/cm 3 ), high compressive strength (260-450 N/mm 2 ), very low water absorption
capacity (0.1-0.2%), and reduced heavy metals leachability. Such materials are
able to meet the requirements for normal-weight aggregates for use in concrete.
Keywords: incinerator fly ash, washing step, ceramic processing, sintering,
waste reuse, artificial aggregates, heavy metals, leaching behaviour.
1 Introduction
Although landfill remains the primary disposal method for Municipal Solid
Waste (MSW), poor availability of new landfill sites combined with increasing
MSW production and landfilling costs, and potential long-term adverse
environmental effects of landfilling have hastened efforts in many industrialised
countries to adopt incineration as a viable alternative for MSW management.
Keywords
incinerator fly ash, washing step, ceramic processing, sintering,
waste reuse, artificial aggregates, heavy metals, leaching behaviour.
Related Book
Other papers in this volume
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