Department of Materials Science and Engineering, Izmir Institute of Technology, 35430 Izmir, Turkey; Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway.
Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway.
Waste Manag. 2021 Jul 1;130:65-73. doi: 10.1016/j.wasman.2021.05.012. Epub 2021 May 27.
The increasing use of aluminimum in packaging applications results in many different aluminium-based products ending up in consumer mixed-waste bins. This waste is typically incinerated, generating an aluminium-containing bottom ash. The current work investigates the recyclability of the aluminium fraction in the bottom ash from waste incineration plants in the USA, UK and Denmark. Incinerated Al-samples from different size fractions (2-6 mm, 6-12 mm and 12-30 mm) were characterized in terms of inherent oxide thickness, re-melting yield/coagulation and composition. The measured average oxide thickness on Al particles was 68 µm (SD=100), with the metal yield and coagulation efficiency measured to between 76 and 92% and 87-99% respectively. Larger particle size fractions resulted in a higher metal yield due to their higher mass to surface ratio. A simplified model correlating metal yield and particle size was proposed. The aluminium content of the melted material was determined to between 95.6 and 98.5% with main impurities being Fe, Si, Mn, Zn, Mg and Cu, corresponding to major aluminium alloying elements and waste charge components.
随着包装应用中铝的使用越来越多，许多不同的含铝产品最终都进入了消费者的混合废物箱。这些废物通常被焚烧，产生含有铝的底灰。目前的工作研究了来自美国、英国和丹麦的废物焚烧厂底灰中铝部分的可回收性。对不同粒径（2-6 毫米、6-12 毫米和 12-30 毫米）的焚烧铝样品进行了固有氧化层厚度、重熔收率/凝固和成分方面的特性研究。测量得到的铝颗粒上的平均氧化层厚度为 68µm（SD=100），金属收率和凝固效率分别在 76%至 92%和 87%至 99%之间。较大的粒径分数由于其较大的质量与表面积比，导致更高的金属收率。提出了一个简化的模型来关联金属收率和颗粒大小。熔融材料的铝含量在 95.6%至 98.5%之间，主要杂质为 Fe、Si、Mn、Zn、Mg 和 Cu，对应于主要的铝合金元素和废物成分。
