DC Arc Plasma Furnace Melting of Waste Incinerator Fly Ash

Municipal solid waste incinerator（MSWI）fly ash was melted using a set of di-rect current（DC）arc plasma furnace system for the first time in China.At a feed-rate offlying ash of 80 kg/h,the temperature at the gas outlet was above 1300℃.Dioxins in theoff-gas were recorded as 0.029 ng I-TEQ/Nm;（international toxic equivalent,I-TEQ）,well be-low 0.5 ngTEQ/Nm;（toxic equivalent,TEQ）,while those in the melted product（slag）were0.00035 ng/g I-TEQ.Molten slag from the furnace showed excellent resistance against the leachingof heavy metals.These results prove that the plasma furnace is effective for the detoxification andstabilization of MSWI fly ash.