Study on the Mechanical Properties and Heavy Metal Ions Immobilization Capability of Solidified Body for MSWI Fly Ash with Geopolymer

Abstract:

In this study, municipal solid waste incineration fly ash (hereinafter called MSWI fly ash) was used as a main raw material, and it was prepared into a solidified body for MSWI fly ash with geopolymer by a single-component chemical alkali excitation method. The results were shown that when the content of MSWI fly ash was 50%, SiO₂/Al₂O₃ was between 3.51-4.04, and Na₂O/Al₂O₃ was between 0.24-0.30, with the increasing of SiO₂/Al₂O₃ and Na₂O/Al₂O₃, the 28d compressive strength of the solidified body showed a trend of increasing first and then decreasing, the maximum 28d compressive strength was 17.7MPa. When SiO₂/Al₂O₃ was 4.04 and Na₂O/Al₂O₃ was 0.30, the minimum leaching concentrations of Pb²⁺ and Cd²⁺ were 0.018mg/L and 0.027 mg/L. When the content of MSWI fly ash was increasing, the 28d compressive strength of the solidified body gradually decreased, and the heavy metal ions leaching concentration gradually increased. The result of XRD and FTIR indicated that the MSWI fly ash was involved in the polymerization reaction, and the heavy metal ions in MSWI fly ash were also chemically solidified into the geopolymer structure.

• Periodical: Materials Science Forum (Volume 1036)
• Pages: 301-308
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1036.301
• Online since: June 2021
• Authors: Qing Wang, Xin Rui Wang, Hai Cao, Zhao Yang Ding, De Yong Kong*
• Keywords: Geopolymer, Heavy Metal Ions, MSWI Fly Ash, Single-Component, Solidified Body

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