Novel Evaluation Method of Quality of Material in Urban Ore in terms of Total Material Requirement

本文将城市矿石中化学元素回收利用的总物质需求量（TMR）（城市矿石TMR，UOTMR）与自然矿石冶炼提取元素的总物质需求量（TMR，NO-TMR）进行了比较，以评价城市矿石与自然矿石的品位。在NO-TMR框架的基础上，提出了UO-TMR框架。首次估算和评价了报废家用电器的UO-TMR。估计是使用情景分析进行的，其中考虑到高级回收利用的额外能源，回收的元素和/或材料的数量发生了变化。还估计了四种类型的日本建筑物的材料回收利用的TMR，并评估了回收材料（如由废料制成的钢材）的功能增加与增加功能所需的额外能源和材料投入之间的权衡。最后，通过对资源依存度的国别分解分析，提出了一种新的资源依存度综合评价方法。

In this study, the total materials requirement (TMR) to recycle chemical elements from the urban ore by recycling (urban ore TMR, UOTMR) has been compared with the TMR to extract the element from the natural ore by smelting (nat ural ore TMR, NO-TMR) in order to evaluate the urban ore grade on an equal footing with the natural ore. A framework of UO-TMR based on the NO-TMR framework is developed. The UO-TMR for end-of-life electric home appliances have been first estimated and evaluated. The estimation were carried out using scenario analyses, in which the number of recycled elements and/or materials was changed considering additional energy for advanced recycling. The TMRs for the recycling of materials from four types of Japanese buildings have been also estimated and the trade-off between the increase in function of recycled materials such as steel made from scrap and the additional inputs of energy and materials required to create the increase in function were evaluated. A novel method to evaluate an integrated indicator for resource dependency by using TMR has been finally developedfrom the country-by-country breakdown analyses of TMR.