The study of firing of a ceramic body made from illite and fluidized bed combustion fly ash
Result description
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.
Keywords
FiringFly ashIllitic ceramicsInternal frictionMechanical strengthWasteYoung’s modulus
The result's identifiers
Result code in IS VaVaI
Result on the web
DOI - Digital Object Identifier
Alternative languages
Result language
angličtina
Original language name
The study of firing of a ceramic body made from illite and fluidized bed combustion fly ash
Original language description
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.
Czech name
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Czech description
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Classification
Type
Jimp - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
20504 - Ceramics
Result continuities
Project
GBP105/12/G059: Cumulative time dependent processes in building materials and structures
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Thermal Analysis and Calorimetry
ISSN
1388-6150
e-ISSN
1588-2926
Volume of the periodical
127
Issue of the periodical within the volume
1
Country of publishing house
HU - HUNGARY
Number of pages
11
Pages from-to
79-89
UT code for WoS article
000392337000009
EID of the result in the Scopus database
2-s2.0-84964426643
Result type
Jimp - Article in a specialist periodical, which is included in the Web of Science database
OECD FORD
Ceramics
Year of implementation
2017