Politecnico di Milano, Milan, Italy.
Waste Manag Res. 2013 Sep;31(9):954-9. doi: 10.1177/0734242X13493956. Epub 2013 Jul 5.
The recovery of aluminium (Al) scraps from waste incineration bottom ash is becoming a common practice in waste management. However, during the incineration process, Al in the waste undergoes oxidation processes that reduce its recycling potential. This article investigates the behaviour of Al scraps in the furnace of two selected grate-fired waste-to-energy plants and the amount recoverable from the bottom ash. About 21-23% of the Al fed to the furnace with the residual waste was recovered and potentially recycled from the bottom ash. Out of this amount, 76-87% was found in the bottom ash fraction above 5 mm and thus can be recovered with standard eddy current separation technology. These values depend on the characteristics and the mechanical strength of the Al items in the residual waste. Considering Al packaging materials, about 81% of the Al in cans can be recovered from the bottom ash as an ingot, but this amount decreases to 51% for trays, 27% for a mix of aluminium and poly-laminated foils and 47% for paper-laminated foils. This shows that the recovery of Al from the incineration residues increases proportionally to the thickness of the packaging.
从垃圾焚烧底灰中回收铝（Al）废料正成为废物管理中的常见做法。然而，在焚烧过程中，废物中的铝经历了氧化过程，降低了其回收潜力。本文研究了两种选定的炉排式垃圾焚烧发电厂中炉内铝废料的行为以及可从底灰中回收的铝量。约有 21-23%的残余废物中添加的铝在炉内被回收，并可从底灰中潜在回收利用。其中，76-87%存在于 5 毫米以上的底灰中，因此可以使用标准的涡流分离技术进行回收。这些值取决于残余废物中铝制品的特性和机械强度。考虑到铝包装材料，罐中约 81%的铝可以作为铸锭从底灰中回收，但这一数量对于托盘会减少到 51%，对于铝和多层箔的混合物会减少到 27%，对于纸层压箔会减少到 47%。这表明，从焚烧残渣中回收铝的比例与包装的厚度成正比。
