AluminiumAluminium is used in packaging due to its densityDensity, strength and preservative capabilities. This paper outlines a methodology to evaluate the recyclability of aluminiumAluminium waste, where parameters of scrap type, pre-treatment and remelting conditions are alternated in a factorial design, with measurements of yield and analysis of metal quality. In preliminary experiments three aluminiumAluminium waste materials were evaluated for recyclability. The methodology was tested on one of the waste materials from mixed household waste, named Cans, and will be described in detail. Cans was decoated at 300 and 550 °C. The decoated material was then remelted, 4 separate additions of ~2 kg per experiment, by submerging the sample material in molten aluminiumMolten aluminium. PorosityPorosity, oxide inclusion content and alloy composition were analysed to determine metal quality. The experimental results show that the yield of remelting, drossDross formation relative to melted sample material and the alloy composition of the remelted metal is dependent on decoating temperature. In conclusion: Cans are recyclable, with good quality and yield, when decoated before melting. Decoating at 550 °C improves metal yield and oxide inclusion content compared to decoating at 300 °C, however it also reduces magnesium content in the resulting alloy. Hopefully the methodology is useful for assessing the recyclability of an aluminiumAluminium-rich waste and for evaluating the effects of various process parameters during recyclingRecycling on metal yield and quality.
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- Recycling of Aluminium from Mixed Household Waste
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