Production of thermal insulation blocks from bottom ash of fluidized bed combustion system

The issues of disposal and environmental problems are increased by the generation of bottom ash from the thermal power plants day by day; hence, its recycling is required. The present study aimed to make thermal insulation blocks using as raw material bottom ash and iron ore slime as a binder and to...

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Bibliographic Details
Published in:Waste management & research 2017-08, Vol.35 (8), p.810-819
Main Authors: Mandal, AK, Sinha, OP
Format: Article
Language:English
Subjects:
Aluminum
Bottom ash
By products
Coal Ash
Coal industry
Compressive strength
Construction Materials
Electric power generation
Electric power plants
Engineering
Fineness
Firing
Fluidized bed combustion
Fluidized beds
Heat transfer
Insulation
Iron
Iron compounds
Melting
Porosity
Power plants
Recycling
Slime
Temperature
Temperature effects
Thermal conductivity
Thermal insulation
Thermal power
Thermoelectricity
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Summary:The issues of disposal and environmental problems are increased by the generation of bottom ash from the thermal power plants day by day; hence, its recycling is required. The present study aimed to make thermal insulation blocks using as raw material bottom ash and iron ore slime as a binder and to characterize their engineering properties. Two different fineness values of bottom ash were considered with varying amounts of iron ore slime (0–10%) to make the blocks. Blocks were dried followed by firing at 1000, 1100 and 1200°C, respectively. Cold crushing strength, density and thermal conductivity of these fired blocks showed increasing behaviour with firing temperature, fineness of bottom ash and iron ore slime content. In contrast, a reverse trend was observed in the case of porosity. With increasing firing temperature, the formation of lower melting phases like iron silicate followed by iron aluminium silicate was observed, which imparts the strength inside the blocks. The coarser particles of bottom ash increase the interparticle spaces, which enhances the apparent porosity, resulting in higher thermal insulation property in the blocks. Blocks having better thermal insulation property could be possible to make effectively from coarse bottom ash by adding iron ore slime as a binder.
ISSN:0734-242X
1096-3669
DOI:10.1177/0734242X17707575