Chemical Industry and Chemical Engineering Quarterly 2012 Volume 18, Issue 3, Pages: 373-383
https://doi.org/10.2298/CICEQ111128013T
Full text ( 699 KB)
Cited by
Leaching of the potentially toxic pollutants from composites based on waste raw material
Terzić Anja (Institute for Materials Testing, Belgrade)
Radojević Zagorka (Institute for Materials Testing, Belgrade)
Miličić Ljiljana (Institute for Materials Testing, Belgrade)
Pavlović Ljubica (Institute for Technology of Nuclear and Other Raw Mineral Materials, Belgrade)
Aćimović Zagorka (Faculty of Technology and Metallurgy, Belgrade)
The disposal of the fly ash generated in coal based power-plants may pose a
significant risk to the environment due to the possible leaching of hazardous
pollutants, such as toxic metals. Also, there is a risk of leaching even when
fly ash is built-in the construction composites. Fly ashes from various
landfills were applied in several composite samples (mortar, concrete and
brick) without any physical or thermal pre-treatment. The leachability of the
potentially toxic pollutants from the fly ash based products was
investigated. The leaching behavior and potential environmental impact of the
11 potentially hazardous elements was tracked: Pb, Cd, Zn, Cu, Ni, Cr, Hg,
As, Ba, Sb and Se. A detailed study of physico-chemical characteristics of
the fly ash, with accent on trace elements and the chemical composition
investigation is included. Physico/chemical properties of fly ash were
investigated by means of X-ray fluorescence, differential thermal analysis
and X-ray diffraction methods. Scanning electron microscope was used in
microstructural analysis. The results show that most of the elements are more
easily leachable from the fly ash in comparison with the fly ash based
composites. The leaching of investigated pollutants is within allowed range
thus investigated fly ashes can be reused in construction materials
production.
Keywords: fly ash, construction materials, leaching test, toxic pollutants, possible reuse