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Improving immobilization efficiency and mechanism analysis of sodium hexametaphosphate on MgO-based cementitious material solidified MSWI FA

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  • Material Cycles toward Carbon Neutral Society
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Abstract

MgO-based cementitious material (MCM) is a potential green substitute for solidifying municipal solid waste incineration fly ash (MSWI FA). Sodium hexametaphosphate (SHMP), a commonly used dispersant, has a great influence on the hydration process of MCM-MSWI FA blends. In this study, the effect of different SHMP additions on the performance of the MCM-MSWI FA (3:7 in mass ratio) blends was investigated. The compressive strength and leaching toxicity of the blends were measured, and the structural evolution was analyzed by XRD, FTIR, TG/DTG, and SEM. These tests revealed that the addition of SHMP could significantly optimize the effect of MCM solidifying MSWI FA since SHMP could promote the dispersion of hydration products in the blends. The blends containing more than 1% SHMP exhibited immobilization efficiencies higher than 97.5% for heavy metals (Cd, Pb, and Zn) after curing for 28 days. Collectively, this work demonstrates the indispensable role of SHMP in the application of MCM solidifying MSWI FA, providing theoretical support for practical engineering.

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Acknowledgements

This study is supported by the National Key Research and Development Program of China (Grant No. 2018YFC1901302), the Innovative Research Groups of the National Natural Science Foundation of China (Grant No. 51621005), Power Construction Corporation of China Science and Technology Project (Grant No. DJ-PTZX-2018-01).

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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, Ling Long, Xiaobo Liu & Xuguang Jiang

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

    Yin Duan, Ling Long, Xiaobo Liu & Xuguang Jiang

  3. Hangzhou Xiaoshan Jinjiang Green Energy Co., Ltd., Xiaoshan, Hangzhou, 311200, China

    Lin Zheng

  4. Power China Hebei Electric Power Design and Research Institute Co., Ltd. D, No. 6 Jianhua North St., Shijiazhuang, 050031, China

    Yimeng Zhao

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  1. Yin Duan
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Additional file 1. Table S1

: Leaching concentrations of MCM solidified MSWI FA blends at 7 days (mg/L). Table S2: Leaching concentrations of MCM solidified MSWI FA blends at 14 days (mg/L). Table S3: Leaching concentrations of MCM solidified MSWI FA blends at 28 days (mg/L). Table S4: Costs of the materials. Fig. S1: SEM micrographs of raw materials: a MgO, b silica fume. Fig. S2: XRD pattern of the raw MSWI FA. Fig. S3: SEM images of the raw MSWI FA.

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Duan, Y., Zheng, L., Zhao, Y. et al. Improving immobilization efficiency and mechanism analysis of sodium hexametaphosphate on MgO-based cementitious material solidified MSWI FA. J Mater Cycles Waste Manag 25, 1781–1791 (2023). https://doi.org/10.1007/s10163-023-01608-9

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