Study on characteristics of ash and slag from two kinds of hospital waste incinerations
两种医疗垃圾焚烧炉的灰渣特性研究

In order to evaluate the environmental hazards of hospital waste incinerator ash and slag and probe safety and effective way of processing, the characteristics such as the chemical composition, mineralogy, morphology, metal contentS and leaching behavior of heavy metal etc have been respectively analyzed on the bag fly ash and bottom slag in gyration kiln and fixed bed by using XRF, XRD, SEM and AAS. Results show the loss on ignition of the bag fly ash in gyration kiln and fixed bed is respectively 31.2% and 34.6% , and they have high contents of chloride, sulphate, alkila metal which the major crystalline phases is CaSO4 and NaCl. Moreover, The leaching concentratio of Cd ,Zn and Pb in bag fly ash exeeds the landfill allowable thresholds of the hazardous waste, the leaching behaviors of heavy metals are possibly realted to the irregular sponge-like porous particles with smaller spheres. Besides, the bottom slag mainly consistes of silicates with low leachability , so it may be classfied as non-hazardous wastes.