In order to stabilize and reuse fly ashes from municipal solid waste incineration(MSWI),different pretreatment procedures before solidification with cement are studied to find out the changes of resulted blocks in compressive strength and heavy metal leaching.Three pretreatment methods are investigated: 1) humidifying fly ash with deionized water and stored under anaerobic condition for 24h;2) treating fly ash with FeSO4 solution;and 3) no pretreatment.The results shows that under the same mixing ratio of f...