Characteristics and properties of a mixture containing fly ash, hydrated lime, and an organic additive

Laboratory tests were carried out to obtain the "stabilization" of a fly as hes (FA) from municipal solid waste (MSW) incinerator plant, by addition of hydrated lime (20% w/w). Room-temperature granulation of the mix with diff erent amounts of water, containing a polyaminoalkylolic additive, was carri ed out in a rotating drum. The presence of the organic additive in the mixe s increases the compressive strength of the granules seasoned at the room t emperature; moreover, the leachability of the chromium (VI) ion in acid med ium (standard test) decreases. Cylindrical specimens were also tested for b oth mechanical strength and leaching behaviors. The inertization with hydra ted lime and organic additive is simpler and less expensive than any other method so far investigated. The FA was characterized by means of X-ray diff raction, thermogravimetry, chemical, and particle-size analyses.