BEHAVIOUR STUDY OF Pb DURING MELTING SEPARATION PROCESS OF MUNICIPAL SOLID WASTE (MSW) INCINERATOR FLY ASH

摘要

Municipal solid waste (MSW) incineration fly ash is classified as a hazardous waste because it contains amounts of heavy metals and dioxins, which cause environmental pollution. So it should be specially treated. Thermal treatment is one of the promising solutions among the various available technologies. However, the migration and distribution of Pb was rarely reported systematically. To better reuse fly ash, the behaviour of Pb during the iron-bath melting separation process was characterized. In addition, the controlled experiment was carried out and the behaviour of Pb during this process was also investigated. The results showed that iron-bath melting separation promoted Pb transfer from the slag phase to the gas phase indeed. And the leaching concentration of Pb was lower than the Chinese regulatory thresholds.