Strength, Leachability And Microstructure Characterisation Of Na2SiO 3-Activated Ground Granulated Blast-Furnace Slag Solidified MSWI Fly Ash  

Oleh:

Zhang, Dajie ; Liu, Wenshi ; Hou, Haobo ; He, Xinghua

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Waste Management & Research vol. 25 no. 5 (Oct. 2007), page 402-407.
Topik: municipal solid waste incinerator fly ash; heavy metals; leaching toxicity; ground granulated blast furnace slag; solidification; wmr 1073–5
Fulltext: 402.pdf (466.46KB)

Isi artikel

The chemical composition and the leachability of heavy metals in municipal solid waste incinerator (MSWI) fly ash were measured and analysed. For the leachability of unstabilized MSWI fly ash it was found that the concentrations of Pb and Cr exceeded the leaching toxicity standard. Cementitious solidification of the MSWI fly ash by Na2SiO3-activated ground granulated blast-furnace slag (NS) was investigated. Results show that all solidified MSWI fly ash can meet the landfill standards after 28 days of curing. The heavy metals were immobilized within the hydration products such as C–S–H gel and ettringite through physical encapsulation, substitution, precipitation or adsorption mechanisms.

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