The plasma vitrification is one method of detoxification and disposal of municipal waste incinerator (MSWI) fly ash. To obtain key data for engineering application, MSWI fly ash was melted with a pilot scale plasma furnace at the conditions of continuous feeding and discharging. The properties of slag, secondary fly ash and off-gas were analyzed, and the energy consumption calculated. According to the test, the densities of slag quenched by water and air are 3.01 and 2.90 g/cm3
, respectively. The leaching test results of heavy metals from the two kinds of slags were all below the limits in Identification standards for hazardous wastes-Identification for extraction toxicity
(GB 5085.3-2007). During the pilot scale test, about 280 kg fly ash was melted, and energy consumption of fly ash melting was 1.12 kW·h/kg. The production ratio of secondary fly ash was 7.1%, with NaCl and KCl as its major components.