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In this paper,the fly ash sample was collected from the MSW incinerator located in Changzhou.The carbonation experiment was performed by using pure CO2.The influence of liquid-to-solid(L/S)ratio,reaction temperature and reaction time was studied.Minerals changes in the fly ash sample were investigated by means of the X-ray diffraction and the amount of CO2 absorbed by carbonation treatment was analyzed by the thermogravimetric-differential scanning calorimeter.