Taking fly ash from municipal solid waste(MSW) incineration in three operating power plants using MSW as fuel in East China as objects of study

the microscopic form appearance

mineral composition

and leaching characteristics of different fly ash have been studied.The results show that:(1)the fly ash is mainly composed from large amount of irregular crystaline and amorphous compounds

the appearace of fly ash is loose

the spherical

oval

and flake particles are interlaced in the fly ash

the partide size of fly ash is mainly 50μm~80μm;(2)the main crystaline phase of fly ash are chlorides(NaCl

KCl

CaCl2)

cacium compounts(CaCO3

CaSO4)

silicates

oxides

and other complex compounts;(3)the fly ash has higher leaching toxicity

thus

being classified as hazardous waste

the mass fraction of cadmium

chromium

lead

copper

and zinc in fly ash is much higher than that in soil

the leaching ratio of Pb

Cr in three kinds of fly ash

as well as the leaching value of Zn from FA1 and FA2 are exceeding the set standard value for hazardous waste.