2021 Fiscal Year Final Research Report
Construction of novel recycling process of platinum group metals using "dry aqua regia"
| Project/Area Number |
19K20483
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 64030:Environmental materials and recycle technology-related
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| Research Institution | Chiba University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 白金族金属 / リサイクル / 使用済み触媒 / 固体王水 / 固液分離 |
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| Outline of Final Research Achievements |
Platinum Group Metals (PGMs), such as platinum, are very important materials for the environment and advanced technologies, but their refining and recycling have a large environmental impact and low supply stability. In this study, we established a method to directly treat and recover PGMs under mild conditions by using a composite molten salt composed mainly of iron(III) chloride as "dry aqua regia" while minimizing the generation of liquid waste and treatment at high temperatures. In addition, we have also established a method that can achieve the separation of elements using a very simple process.
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| Free Research Field |
金属精錬・リサイクル
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| Academic Significance and Societal Importance of the Research Achievements |
PGMsは貨幣や宝飾品の他に工業的にも利用され、環境・先端技術分野では自動車用触媒や半導体製造用るつぼなどが挙げられる。一方で精錬やリサイクルの環境負荷の大きさや、供給安定性の低さから、リサイクルによるスクラップの有効利用が極めて重要となる。本研究における「固体王水」は、従来よりも穏和な条件で効率よくスクラップを処理できる基礎的技術となり、二次資源としてのスクラップの利用可能性を向上させることで、一次資源必要量の削減とあわせてPGMsのライフサイクル全体での環境負荷の大きな軽減が期待される。
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