The study of firing of a ceramic body made from illite and fluidized bed combustion fly ash

Fly ash from coal combusting thermal power plants is a serious problem from the point of view of its storing and pollution of the environment. Currently, thermal power plants change the combustion technology from pulverized firing to fluidized bed combustion. A promising reutilization of the fly ash...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2017, Vol.127 (1), p.79-89
Main Authors: Húlan, Tomáš, Trník, Anton, Kaljuvee, Tiit, Uibu, Mai, Štubňa, Igor, Kallavus, Urve, Traksmaa, Rainer
Format: Article
Language:English
Subjects:
Analysis
Analytical Chemistry
Bulk density
Bulk modulus
Calcite
Calcite crystals
Ceramics
Ceramics industry
Chemistry
Chemistry and Materials Science
Clay
Combustion
Cooling
Differential thermal analysis
Elastic properties
Electric power generation
Electric power plants
Firing
Fluidized bed combustion
Fluidized beds
Fly ash
Illite
Inorganic Chemistry
Internal friction
Low temperature
Measurement Science and Instrumentation
Modulus of elasticity
Phase transitions
Physical Chemistry
Polymer Sciences
Power plants
Thermal power plants
Thermoelectricity
Thermophysical properties
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Summary:Fly ash from coal combusting thermal power plants is a serious problem from the point of view of its storing and pollution of the environment. Currently, thermal power plants change the combustion technology from pulverized firing to fluidized bed combustion. A promising reutilization of the fly ash from fluidized bed combustion (FFA) shows itself in the ceramic industry. In this paper, the influence of the FFA content in illite-based ceramics on its thermophysical and elastic properties was investigated during heating and cooling stages of firing. The samples are made from a mixture of the illitic clay (60 mass%), various portion of FFA (0–40 mass%) and grog (40–0 mass%). The impulse excitation technique is used for the determination of Young’s modulus and the internal friction. Analyses that included DTA, TG, thermodilatometry, XRD and SEM are used to obtain the better understanding of the development of the phase transformations in the samples. It is found that a higher amount of FFA in the sample leads to a higher mass loss at low temperatures, a higher mass loss due to the decomposition of calcite, a less intensive shrinkage after firing, a lower bulk density and lower Young’s modulus during firing above 800 °C and after cooling. After firing of the samples at 1100 °C, the mechanical strength and Young’s modulus decrease with the FFA content. A linear relationship between Young’s modulus and the mechanical strength is observed.
ISSN:1388-6150
1588-2926
1572-8943
DOI:10.1007/s10973-016-5477-8