Using inorganic polymer to reduce leach rates of metals from brown coal fly ash

Bankowski, P., Zou, Linda and Hodges, R. 2004, Using inorganic polymer to reduce leach rates of metals from brown coal fly ash, Minerals engineering, vol. 17, no. 2, pp. 159-166.

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Title Using inorganic polymer to reduce leach rates of metals from brown coal fly ash
Author(s) Bankowski, P.
Zou, Linda
Hodges, R.
Journal name Minerals engineering
Volume number 17
Issue number 2
Start page 159
End page 166
Publisher Pergamon
Place of publication Oxford, England
Publication date 2004-02
ISSN 0892-6875
1872-9444
Keyword(s) Environmental
waste processing
leaching
Summary The burning of brown coal for electricity generation produces thousands of tonnes of fly ash each year. Treatment of the fly ash can reduce leach rates of metals and allow it to be disposed in less prescribed landfill. A geopolymer matrix was investigated as a potential stabilisation method for fly ash obtained from electrostatic precipitators and ash disposal ponds. The ratio of fly ash and geopolymer was varied to determine the effects of different compositions on leaching rates. The major element leachate concentrations obtained from pond ash were lower than that of precipitator fly ash. Conversely, precipitator ash-geopolymers were better for trace heavy metal stabilisation. Effective reduction of elemental concentrations in the leachate has been achieved, particularly for calcium, arsenic, selenium, strontium and barium. Scanning electron microscopy revealed the distribution of metals originated from fly ash and from added geopolymer material. It also showed that some elements are leached from ash particles to the geopolymer phase and others remained as undissolved particles. Qualitative analysis showed that fly ash particles interacted with the geopolymers phase through surface reactions.
Language eng
Field of Research 090703 Environmental Technologies
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2003, Elsevier Ltd
Persistent URL http://hdl.handle.net/10536/DRO/DU:30002544

Document type: Journal Article
Collection: School of Engineering
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