2013 Fiscal Year Final Research Report
Development of methodology for estimating recoverable reserves of urban mine
| Project/Area Number |
22686084
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Recycling engineering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
DAIGO ICHIRO 東京大学, 工学(系)研究科(研究院), 准教授 (20396774)
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| Project Period (FY) |
2010-04-01 – 2014-03-31
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| Keywords | 使用済み回収率 / non-functional recycling / hibernating stock / 物質ストック / 物質フロー分析 / トランプエレメント / 鋼材中微量元素 / 観測時点基準使用年数分布 |
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| Research Abstract |
Recoverable urban mine was defined as the amounts of material stock which can be going to be recycled. End-of-life recycling rates of metallic materials for each year in the past two decades were evaluated. The time-series EoL-RR showed a deviation of more than twenty percent. High EoL-RRs were shown during a period when prices of the material are high, which were expected to be caused by hibernating behavior of material stock. Four category of Urban mine were classified in terms of recoverability; such as materials to be recovered, dissipated materials, materials embedded in EoL products not to be recovered and materials not to be liberated from recovered EoL products. The evidence of the fourth category was found as precious metals in electric arc furnace steel. As summarizing knowledge of recyclability of urban mine, the tree of conditions which required for conducting processes in the chain of recycling from EoL products.
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