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Effect of water-extraction on characteristics of melting and solidification of fly ash from municipal solid waste incinerator

Authors :
Jiang, Yonghai
Xi, Beidou
Li, Xiujin
Zhang, Ling
Wei, Zimin
Source :
Journal of Hazardous Materials. Jan2009, Vol. 161 Issue 2/3, p871-877. 7p.
Publication Year :
2009

Abstract

Abstract: This study was conducted to investigate the effect of water-extraction process on the removal of major elements and heavy metals in the fly ash from Municipal Solid Waste Incinerator (MSWI), and their thermal stability in the following melting process. The water-extraction was first applied to extract soluble elements and heavy metals from the fly ash from MSWI at different liquid-to-solid rates (L/S) of 2, 5, and 10, respectively. The extracted fly ash and the raw fly ash were then melted at the temperatures of 1000–1350°C in an electrically heated furnace. The results showed that the compounds of Ca, Na, K, and Cl achieved high removal rates of 30.7–72.8% at L/S=10, respectively, Cr was the most extractable heavy metal with removal rate of 12.3% among the several heavy metals tested. The water-extracted fly ash had better stability as compared to raw one, which was indicated by lower weight loss and better immobilization ability of heavy metals such as Zn, Cu, and Pb in the melting process. The results showed that combing water-extraction and melting process could provide one of the alternatives for treating MSWI fly ash in China for reutilization. [Copyright &y& Elsevier]

Details

Language :
English
ISSN :
03043894
Volume :
161
Issue :
2/3
Database :
Academic Search Index
Journal :
Journal of Hazardous Materials
Publication Type :
Academic Journal
Accession number :
35329530
Full Text :
https://doi.org/10.1016/j.jhazmat.2008.04.033