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Leaching of metals from fly ashes in the presence of complexing agents
Pavel Janos1, Michaela Wildnerová, Tomás Loucka
1Research Institute of Inorganic Chemistry, Ustí nad Labem, Czech Republic. pavel.janos@vuanch.cz
Abstract:
The leachability of some metals (Al, As, Ba, Ca, Cr, Cu, Fe, K, Mg, Mn, Ti, Zn) from fly ashes was studied in the presence of ethylenediamine tetraacetic acid (EDTA) and naturally occurring complexing agents-humic acids (HAs). Secondary complex-forming equilibria taking place in the leachates increase significantly the leached amounts of most metals. Kinetic experiments showed that almost the whole "available" amounts of metals are leached from fly ash within a time period of several hours (mostly within 20 h), with exceptions of matrix constituents (typically aluminium), which are released more slowly.