Behavior of heavy metals in the vitrification of MSWI fly ash with a pilot-scale diesel oil furnace

摘要

Characteristics of heavy metals during heat-treatment municipal solid waste incinerator (MSWI) fly ash were investigated in this paper.The experiment was performed using a pilot-scale oil furnace in the range 800-1350°C.In this work we investigated the effect of temperature on solidification efficiency,evaporation of heavy metals and on composition change,X-ray diffractometer (XRD),the leach toxicity of molten slag.The results showed that the main contents,solidification efficiency and evaporation of heavy metals had a tremendous change between 1150-1260°C.With temperature increasing,the percentage of CaO,SiO2 and Al2O3 increased,and SO3,K2O,Na2O and Cl deereased.Especially in 1260°C,the four compositions decreased sharply from 43.72％ to 0.71％.Finally,the leaching concentrations of all heavy metals in molten slag were far lower than the standard values of TCLP.