The solidification of aluminum production waste in geopolymer matrix

The solidification of highly alkaline, generally semi-liquid red waste and gray slag from the aluminum production inhibits toxic properties. The chemical and mineralogical compositions of waste materials were determined and both materials were transformed to the solids (compact and foamed materials)...

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Bibliographic Details
Published in:Journal of cleaner production 2014-12, Vol.84, p.657-662
Main Authors: Perna, Ivana, Hanzlicek, Tomas
Format: Article
Language:English
Subjects:
Alkalinity
Aluminum
Aluminum waste
Foams
Geopolymer
Hazardous
Precursors
Recycling
Solidification
Wastes
Work study
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Summary:The solidification of highly alkaline, generally semi-liquid red waste and gray slag from the aluminum production inhibits toxic properties. The chemical and mineralogical compositions of waste materials were determined and both materials were transformed to the solids (compact and foamed materials) through the geopolymer technology. The described method of solidification distinguishes by the inhibition of waste alkalinity, lowering the waste hazardous effect. The resulting solids have sufficient mechanical properties and do not produce any hazardous gasses when heated. The presented work studies the solidification of waste materials from aluminum production and results inform about insulating properties of products when both waste types are reacting with geopolymer precursors. •The solidification of the aluminum-production waste has been investigated.•Presented method doesn't require any additional treatment of aluminum-production waste.•The compact solid product has the compressive strength higher than 30 MPa.•The foamed solid product has low thermal-conductivity values comparable to the polystyrene.
ISSN:0959-6526
1879-1786
DOI:10.1016/j.jclepro.2014.04.043