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Investigation of Mechanochemically Treated Municipal Solid Waste Incineration Fly Ash as Replacement for Cement

Author

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  • Shuping Pan

    (Zhejiang Ecological Environment Monitoring Center, Hangzhou 310007, China)

  • Jiamin Ding

    (Research Institute of Zhejiang University-Taizhou, Taizhou 318000, China)

  • Yaqi Peng

    (State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China)

  • Shengyong Lu

    (State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China)

  • Xiaodong Li

    (State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract

Municipal solid waste incineration (MSWI) fly ash has been classified as hazardous waste in China because of the leachable toxic heavy metals and high concentrations of chlorides and polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs). Currently, the main treatment method is still landfilling after chemical treatment or cement solidification, and an effective approach to realize fly ash utilization is still lacking. In the present work, the fly ash was firstly water-washed to remove the soluble chlorine salts, which can improve the performance of the produced cement mortar in later work. Mechanochemical pre-treatment was adopted to destroy the PCDD/Fs and improve the heavy metals’ stabilization. The results show that 75% of PCDD/Fs can be degraded and that most of the heavy metals are stabilized. After the mechanochemical pre-treatment, the average particle size of the fly ash decreases to 2–5 μm, which is beneficial for promoting the activation energy and accelerating the hydration process in cement mortar production. The compressive and flexural strengths of the fly ash cement mortar improve to 6.2 MPa and 32.4 MPa, respectively, when 35% of the OPC is replaced by treated fly ash. The similarity in the 3-day and 28-day strength with or without the addition of the treated ash shows the light influence of the fly ash addition. Thus, the mechanochemical process can stabilize the heavy metals and activate the fly ash, allowing it to partly substitute ordinary Portland cement in building materials, such as cement raw materials and concrete.

Suggested Citation

  • Shuping Pan & Jiamin Ding & Yaqi Peng & Shengyong Lu & Xiaodong Li, 2022. "Investigation of Mechanochemically Treated Municipal Solid Waste Incineration Fly Ash as Replacement for Cement," Energies, MDPI, vol. 15(6), pages 1-11, March.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:6:p:2013-:d:767975
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    References listed on IDEAS

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    1. Xin-gang, Zhao & Gui-wu, Jiang & Ang, Li & Yun, Li, 2016. "Technology, cost, a performance of waste-to-energy incineration industry in China," Renewable and Sustainable Energy Reviews, Elsevier, vol. 55(C), pages 115-130.
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    1. Stanisław Stryczek & Andrzej Gonet & Marcin Kremieniewski, 2022. "Special Cement Slurries for Strengthening Salt Rock Mass," Energies, MDPI, vol. 15(16), pages 1-10, August.
    2. Monika Czop & Beata Łaźniewska-Piekarczyk & Małgorzata Kajda-Szcześniak, 2022. "Evaluation of the Immobilization of Fly Ash from the Incineration of Municipal Waste in Cement Mortar Incorporating Nanomaterials—A Case Study," Energies, MDPI, vol. 15(23), pages 1-16, November.

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