垃圾焚烧飞灰特性及其重金属固化/稳定化研究迸展.

By comparing and analyzing the solidification/stabilization technology of heavy metals in fly ash, it is found that the chemical stabilization method is simple in operation, low in energy eonsumption, and easy to realize the large-scale disposal of fly ash, but there is also a problem of expensive chemicals. If the chemical additive agent is combined w让h the mechanochemical method to dispose the heavy metals in fly ash, it can react with heavy metal compounds under the action of mechanical force, and generate insoluble heavy metal compounds to achieve the effect of stabilizing heavy metals. The disposal process has low energy consumption, less add让ive amount and can stabilize multiple heavy metals at the same time, which is expected to realize the harmless and resource utilization of fly ash on a large scale. In addition, the leaching risk of heavy metals in fly ash after disposal is easily affected by environmental factors, and the control mechanism of different leaching stages is also different. The eommonly used environmental Risk assessment code(RAC) only considers the proportion of mild acido-soluble fraction state when calculating the environmental risk of fly ash after disposal, which may lead to differences in the evaluation results. In order to accurately predict the environmental risk of fly ash after disposal, a combination of multiple evaluation methods to evaluate the environmental risk of fly ash after disposal may better reflect the accuracy of the evaluation results. The development of new effective and cost chemical stabilizers combined w让h meehanochemieal methods to treat heavy metals in fly ash is an important means to control heavy metals in waste incineration fly ash, and it is necessary to further improve the environmental risk assessment system of fly ash after disposal. [ABSTRACT FROM AUTHOR]