Aluminium recovery from waste incineration bottom ash, andits oxidation level
Aluminium recovery from waste incineration bottom ash, andits oxidation level
复制标题
垃圾焚烧底灰回收铝及其氧化程度
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
M. Grosso
中科院分区：
文献类型：
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作者：
L. Biganzoli;M. Grosso
从垃圾焚烧底灰中回收铝（Al）废料已成为废物管理的一种普遍做法。然而，在焚烧过程中，废物中的铝经历氧化过程，降低了其回收潜力。本文研究了选定的两家栅极烧废电厂炉内铝废料的特性和从底灰中可回收的量。大约21-23%的铝与剩余废物一起被送入炉膛，并有可能从底部灰中回收。其中76-87%为5 mm以上的底灰，可采用标准涡流分离技术回收。这些值取决于残余废料中铝元素的特性和机械强度。考虑到铝包装材料，罐中约81%的铝可以从底部灰中作为锭回收，但对于托盘，这一比例降至51%，对于铝和多层复合箔，这一比例降至27%，对于纸层压箔，这一比例降至47%。这表明，从焚烧残渣中回收的铝与包装的厚度成比例地增加。
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.