An examination was made of the behaviour towards leaching of fly ash produced by a municipal solid waste incineration plant. The release of heavy metals and chloride and sulphate ions was evaluated by means of leaching solutions of different pH values. The chemical composition and mineralogical characteristics of fly ash leached with water was compared with those of the same fly ash untreated. It was found that the water-fly ash interaction causes a marked reduction in the more soluble salts and the formation of some hydrate products in the fly ash. The leaching test at pH 5.0 with 0.5 M acetic acid applied to fly ash solidified with pozzolanic cement revealed a good degree of stabilization achieved.
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