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

Abstract

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

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

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.

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.

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