Co-stabilization of lead,copper and zinc by the sintered products from municipal sludge incineration ash
Industrial solid wastes rich in heavy metals pose a great threat to the ecological environment and are in urgent need of reasonable disposal.It should be further investigated that if the incineration ash of low-aluminum municipal sludge can provide an important matrix for the stabilization of these potential heavy metals.In this study,the incineration ash of municipal sludge was used as the precursor of glass-ceramics,and the phase change law of glass products sintered at different temperatures(600～850 ℃)and its co-stabilization mechanism and effect on lead,zinc and copper were investigated.The results showed that lead tends to combine with aluminum and silicon to form lead feldspar(PbAl2Si2O8)at high temperature,while zinc and copper eventually combine and form spinel solid solution structure(ZnxCu1-xFeyAl2-yO4).Although the leaching behaviors of the three heavy metals are different,the higher the sintering temperature is,the more beneficial to improve their stability.Therefore,to achieve the dual goals of heavy metal stabilization and solid waste resourceisation,this study proposed a new strategy to prepare glass-ceramic products using low-aluminum municipal sludge incineration ash.
municipal sludge incineration residuesglass-ceramicsindustrial wasteheavy metalsco-immobolization
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维普
