Incorporating Simulated Zinc Ash by Kaolinite-and Sludge-based Ceramics:Phase Transformation and Product Leachability

摘要/Abstract

摘要： Zinc is one of the hazardous metals commonly found in municipal solid waste incineration(MSWI) ash,and this study reveals the stabilization mechanisms when sintering zinc-laden ash and ceramic precursors as a waste-to-resource strategy.Using ZnO to simulate the zinc-laden ash and sintering with kaolinite and mullite ceramic precursors,both zinc aluminate spinel(ZnAl₂O₄) and willemite(Zn₂SiO₄) phases were found in the products under the tested thermal conditions.The results also indicate that kaolinite and mullite precursors exhibit different incorporation behavior,and ZnAl₂O₄ and Zn₂SiO₄ were found to be competitive as the Zn-hosting phases in the system.A prolonged leaching test was used to evaluate the leachability of potential product phases in the system.The concentrations of zinc in ZnO and Zn₂SiO₄ leachates were about two orders of magnitude higher than that in ZnAl₂O₄ leachate,indicating the preference of forming ZnAl₂O₄ for zinc stabilization.Furthermore,the aluminum-rich sludge generated from waterworks could be beneficially used as a material resource to stabilize zinc in this study.The X-ray diffraction(XRD) pattern collected from the 1150℃ and 3-h sintered sample shows the suc-cess of incorporating zinc into the ZnAl₂O₄ spinel structure with waterworks sludge precursor.The formation of ZnAl₂O₄ indicates a strong potential for employing aluminum-and silicon-based materials to thermally immobilize zinc and achieve the beneficial use of metal-laden MSWI ash.

关键词: municipal solid waste incineration, spinel, willemite, zinc, sludge, stabilization

Abstract: Zinc is one of the hazardous metals commonly found in municipal solid waste incineration(MSWI) ash,and this study reveals the stabilization mechanisms when sintering zinc-laden ash and ceramic precursors as a waste-to-resource strategy.Using ZnO to simulate the zinc-laden ash and sintering with kaolinite and mullite ceramic precursors,both zinc aluminate spinel(ZnAl₂O₄) and willemite(Zn₂SiO₄) phases were found in the products under the tested thermal conditions.The results also indicate that kaolinite and mullite precursors exhibit different incorporation behavior,and ZnAl₂O₄ and Zn₂SiO₄ were found to be competitive as the Zn-hosting phases in the system.A prolonged leaching test was used to evaluate the leachability of potential product phases in the system.The concentrations of zinc in ZnO and Zn₂SiO₄ leachates were about two orders of magnitude higher than that in ZnAl₂O₄ leachate,indicating the preference of forming ZnAl₂O₄ for zinc stabilization.Furthermore,the aluminum-rich sludge generated from waterworks could be beneficially used as a material resource to stabilize zinc in this study.The X-ray diffraction(XRD) pattern collected from the 1150℃ and 3-h sintered sample shows the suc-cess of incorporating zinc into the ZnAl₂O₄ spinel structure with waterworks sludge precursor.The formation of ZnAl₂O₄ indicates a strong potential for employing aluminum-and silicon-based materials to thermally immobilize zinc and achieve the beneficial use of metal-laden MSWI ash.

Key words: municipal solid waste incineration, spinel, willemite, zinc, sludge, stabilization

施凯闵, 唐圆圆. Incorporating Simulated Zinc Ash by Kaolinite-and Sludge-based Ceramics:Phase Transformation and Product Leachability[J]. Chinese Journal of Chemical Engineering, 2012, 20(3): 411-416.

SHIH Kaimin, TANG Yuanyuan. Incorporating Simulated Zinc Ash by Kaolinite-and Sludge-based Ceramics:Phase Transformation and Product Leachability[J]. Chin.J.Chem.Eng., 2012, 20(3): 411-416.

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