Graduate School of Economics, Waseda University, Tokyo, Japan.
Environ Sci Technol. 2010 Jun 15;44(12):4402-8. doi: 10.1021/es903340h.
In the current recycling system of end-of-life (EoL) appliances, which is based on shredding, alloying elements tend to end up in the scrap of base metals. The uncontrolled mixing of alloying elements contaminates secondary metals and calls for dilution with primary metals. Active disassembling fastener (ADF) is a design for disassembly (DfD) technology that is expected to solve this problem by significantly reducing the extent of mixing. This paper deals with a life cycle assessment (LCA) based on the waste input-output (WIO) model of an ADF developed using hydrogen storage alloys. Special attention is paid to the issue of dilution of mixed iron scrap using pig iron in an electric arc furnace (EAF). The results for Japanese electrical and electronic appliances indicate superiority of the recycling system based on the ADF over the current system in terms of reduced emissions of CO(2). The superiority of ADF was found to increase with an increase in the requirement for dilution of scrap.
在现有的报废电子电气设备（EoL）回收系统中，基于粉碎的回收方法往往会导致合金元素混入到贱金属废料中。这种合金元素的失控混合污染了二次金属，并需要用原生金属进行稀释。主动拆卸紧固件（ADF）是一种拆卸设计（DfD）技术，有望通过显著减少混合程度来解决这个问题。本文采用基于废物流-投入产出（WIO）模型的生命周期评估（LCA）方法，对使用储氢合金开发的 ADF 进行了研究。特别关注了在电弧炉（EAF）中使用生铁稀释混合铁废料的问题。针对日本的电子电气设备，结果表明，基于 ADF 的回收系统在减少 CO(2)排放方面优于现有的回收系统。随着对废料稀释要求的增加，ADF 的优势也随之增加。
