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Effect of the MgO/SiO2 ratio on MgO–silica binders solidifying MSWI fly ash

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Abstract

To improve the effect of MgO–SiO2 binders solidifying municipal solid waste incineration fly ash (MSWI FA), MSWI FA solidified bodies with five MgO/SiO2 ratios (0.41 ~ 3.77) were investigated. The leaching behavior of solidified bodies was evaluated by leaching toxicity tests and pH-dependent experiments. In addition, hydration products in solidified bodies were analyzed by thermodynamic modeling and microstructure characterizations. The results showed that the variation in the MgO/SiO2 ratio had a significant effect on the leaching toxicity of the solidified bodies, because it affected the leachate pH and the composition of the hydration products of the solidified bodies. The acid and alkali resistance of the MSWI FA was enhanced through solidification with MgO–SiO2 binders. MgO can improve the alkalinity of the solidified bodies and facilitate the chemical precipitation of heavy metals. Moreover, silica fume, an industrial waste, can serve as a cost-effective measure. Overall, MgO–SiO2 binders demonstrated great potential as promising candidates for encapsulating MSWI FA.

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Original data will be available from the corresponding author on reasonable request.

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Funding

This study is supported by the key program of the National Natural Science Foundation of China (Grant No. 52236008).

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Authors and Affiliations

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

    Yin Duan, Xiaobo Liu, Zeinab Khalid & Xuguang Jiang

  2. Zhejiang University Qingshanhu Energy Research Center, Linan, Hangzhou, 311305, China

    Yin Duan, Xiaobo Liu, Zeinab Khalid & Xuguang Jiang

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  1. Yin Duan
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  2. Xiaobo Liu
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  4. Xuguang Jiang
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Contributions

YD: experiments, analysis, and writing original draft; XL: review and editing; ZK: review and editing; XJ: supervision and funding acquisition.

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Correspondence to Xuguang Jiang.

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Duan, Y., Liu, X., Khalid, Z. et al. Effect of the MgO/SiO2 ratio on MgO–silica binders solidifying MSWI fly ash. Waste Dispos. Sustain. Energy 5, 551–558 (2023). https://doi.org/10.1007/s42768-023-00164-0

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