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Erschienen in: Journal of Material Cycles and Waste Management 2/2016

12.12.2014 | ORIGINAL ARTICLE

Sintering characteristics of CaO-rich municipal solid waste incineration fly ash through the addition of Si/Al-rich ash residues

verfasst von: Hong-Yun Hu, Huan Liu, Qiang Zhang, Ping-An Zhang, Ai-Jun Li, Hong Yao, Ichiro Naruse

Erschienen in: Journal of Material Cycles and Waste Management | Ausgabe 2/2016

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Abstract

Thermal treatment is a promising technology for the fast disposal of hazardous municipal solid waste incineration (MSWI) fly ash in China. However, fly ash produced in grate incinerator (GFA) is rich in CaO and chlorides, which promote the formation of toxic hexavalent chromium [Cr(VI)] and ash agglomeration during the thermal process, inhibiting the thermal disposal of GFA. In this study, sintering characteristics of CaO-rich GFA were improved by adding Si/Al-rich MSWI ash residues. According to the results, ash agglomeration was well suppressed during thermal treatment of the mixed ash. Si/Al/Fe-compounds competed with un-oxidized Cr-compounds to react with CaO and suppressed Cr(VI) formation. Meanwhile, chlorides in GFA facilitated heavy metal volatilization from added ashes to the secondary fly ash, favoring the recovery of these metals. Ca-aluminosilicates was found as the main mineral phase in the thermally treated mixed ash, which has attractive potential for applications. The formation of the aluminosilicates made the heavy metals that remained in the treated mixed ash more stable than the thermally treated single ash.

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Metadaten
Titel
Sintering characteristics of CaO-rich municipal solid waste incineration fly ash through the addition of Si/Al-rich ash residues
verfasst von
Hong-Yun Hu
Huan Liu
Qiang Zhang
Ping-An Zhang
Ai-Jun Li
Hong Yao
Ichiro Naruse
Publikationsdatum
12.12.2014
Verlag
Springer Japan
Erschienen in
Journal of Material Cycles and Waste Management / Ausgabe 2/2016
Print ISSN: 1438-4957
Elektronische ISSN: 1611-8227
DOI
https://doi.org/10.1007/s10163-014-0341-z

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