Effects of progressive carbonation on heavy metal leaching from cement‐bound waste

DOI 10.1002/aic.10662Published online September 19, 2005 in Wiley InterScience (www.interscience.wiley.com).Contradictory leaching results from carbonated cement-bound wastes have been re-ported in various investigations. However, the degree of carbonation of the examinedsamples is rarely considered as an important parameter in leaching results. This articlefocuses on the effect of progressive carbonation on leaching properties of cement-boundwaste (bottom ash or flue gas cleaning residue), including uncarbonated, partiallycarbonated, and almost completely carbonated samples. Leaching is investigated aftercarbonation by means of semi-dynamic leaching of monoliths, supported by batch solu-bility and release measurements on particle-size reduced material. For partially carbon-ated samples, leaching of metals is in most cases less than observed from uncarbonatedsamples, resulting from the conversion of hydroxides to carbonates. For completelycarbonated samples, increased leaching of most metals was observed in comparison topartially carbonated samples, resulting from leachate induced transformation of carbon-ate into more soluble bicarbonate speciation.

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