FLY ASH FROM COAL-FIRED POWER PLANTS AS RAW MATERIAL IN BUILDING MATERIALS INDUSTRY. EXPERIMENTAL ASSESSMENT OF THERMO-PHYSICAL PROPERTIES

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-15-5 / ISSN 1314-2704, June 19-25, 2014, Book 4, Vol. 1, 245-252 pp

ABSTRACT
Electricity generation based on coal combustion still remains in the forefront of attention in terms of low cost, especially when done in large scale industrial plants in areas with direct access to the primary energy source, such as units producing within Oltenia Energy Complex. If ash entrained in the flue gas (fly ash) is ontinuously recovered in the cement industry, heavy ash collected on the bottom of the combustion chamber is more important quantitatively and poses considerable problems regarding discharge into the environment and, moreover, remain a constant problem in terms of deposits generated in time. This paper presents the results of experiments carried out on recovery of heavy ash deposit Valea Ceplea (Turceni) as auxiliary raw material in brick building using clays obtained from the stripping site Rovinari. The positive effects and deficiencies involved the addition of ash manufacturing recipes (variation of density, apparent porosity and mechanical resistance), up to an addition of 10 to 30% (mass) are presented. The results indicate that the use of fly ash as raw material can be effective, especially since, the source is a local industrial waste. The paper is developed based on activities performed within the frame of the EU project LIFE10 ENV/RO/729.

Keywords: fly ash, deposits, mechanical resistance