Tackling the Downcycling Issue—A Revised Approach to Value-Corrected Substitution in Life Cycle Assessment of Aluminum (VCS 2.0)
Tackling the Downcycling Issue—A Revised Approach to Value-Corrected Substitution in Life Cycle Assessment of Aluminum (VCS 2.0)
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解决降级回收问题——铝生命周期评估中价值修正替代的修订方法 (VCS 2.0)
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
J. Florin
中科院分区：
文献类型：
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作者：
C. Koffler;J. Florin
摘要：对于某些金属，当废料被不需要的元素污染或与质量较低的废料混合时，材料在回收时显示出固有特性的变化，就会出现降级循环。文章建议使用不同的废料类别价格，而不是一个单独的二次合金价格，以代表在产品的生命周期对铝造成的降级水平。2007年至2010年，所有可用的废料类别中，废料价格与原铝价格之间的价格比保持稳定。虽然经修订的价值修正替代办法更加强调创造高质量废料，对废料污染的惩罚力度大于原来的办法，但其主要局限性是正确确定沿着废料价值链的适当替代点。如果省略相关的分拣或预处理步骤，替代系数将被过度修正，这就是为什么在废料与其他产品系统的废料混合之前或在废料进入重熔步骤之前确定废料价值至关重要。
Abstract: For some metals, downcycling appears when scrap is polluted with undesirable elements or mixed with lower quality scrap grades in a way that the material displays a change in inherent properties when recycled. The article recommends the use of different scrap class prices instead of a solitary secondary alloy price to represent the level of downcycling inflicted on aluminum over a product’s life cycle. The price ratio between scrap price and primary aluminum price is shown to be stable across all available scrap classes for the years 2007–2010. While the revised approach to value-corrected substitution (VCS) puts a stronger emphasis on the creation of high-quality scrap by penalizing its pollution more than the original version, its key limitation is the correct identification of the appropriate point of substitution along the scrap value chain. If relevant sorting or pre-treatment steps are omitted, the substitution factor would be overcorrected, which is why it is crucial to establish the scrap value right before the scrap is either mixed with scraps from other product systems or right before it enters the remelting step.