Alkali activation of fresh and deposited black coal fly ash with high loss on ignition

Sisol Martin (), Drabová Miroslava () and Mosej Juraj ()
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Drabová Miroslava: Technical University in Košice, Institute of Montaneous Sciences and Environmental Protection, Faculty of Mining, Ecology, Process Control and Geotechnologies, Košice, Slovak Republic;
Mosej Juraj: Technical University in Košice, Institute of Montaneous Sciences and Environmental Protection, Faculty of Mining, Ecology, Process Control and Geotechnologies, Košice, Slovak Republic

Gospodarka Surowcami Mineralnymi / Mineral Resources Management, 2014, vol. 30, issue 2, 13

Abstract: Heating plants and power stations using coal as a fuel are employed worldwide as energy sources, consequently generating large quantities of fly ashes. Only a small part of these fly ashes are used as a secondary raw material. Most commonly, fly ash is deposited at sludge bed where it poses substantial ecological risks. Possibilities of utilizing fly ashes are mainly found in the construction industry; however, utilization of fly ash with a high content of unburned coal residues, expressed by loss on ignition (LOI), is limited to 2-5% LOI by the European standard STN EN 206-1. That is why fly ash with a high content of unburned coal residues is deposited at sludge bed. Fly ash deposition, hand in hand with exogenous and biogenous factors, changes the chemical and phase composition of fly ashes so the possibility for their further utilization as a secondary rawmaterial is evenmore diminished.

Date: 2014
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Persistent link: https://EconPapers.repec.org/RePEc:vrs:gosmin:v:30:y:2014:i:2:p:13:n:4

DOI: 10.2478/gospo-2014-0014

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