Recycle of Incineration Ash of Urban Waste Using Foam Water Glass

摘要

Incineration ash of urban waste was heat-treated at 900 deg C with a foam water glass prepared from NaOH, NaF and Si. The treatment was found to suppress elution of hazardous heavy metals from the ash and simultaneously to decrease the dioxins in the ash. The fluorescence X-ray absorption fine structure (XAFS) measurement indicated that a trace amount of Cr (VI) in the fly ash transformed into a different valence upon treatment. Mortar specimens from the treated bottom ash showed satisfactory strengths and humidity-conditioning properties.