2022 Fiscal Year Final Research Report
Investigation of dissolution characteristics and microstructure control of copper alloy anodes for electrorefining to promote copper recycling
Project/Area Number |
19K05110
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 26060:Metals production and resources production-related
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Research Institution | Ehime University |
Principal Investigator |
Sasaki Hideaki 愛媛大学, 理工学研究科(工学系), 准教授 (10581746)
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Project Period (FY) |
2019-04-01 – 2023-03-31
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Keywords | リサイクル / 状態図 |
Outline of Final Research Achievements |
Focusing on copper (Cu)-silver (Ag)-antimony (Sb) ternary alloys, which are difficult to apply electrorefining, high-temperature equilibrium phases were investigated by microscopy and X-ray diffraction to understand their solidification structures. In order to understand the dissolution and passivation processes of heterogeneous copper alloy anodes, electrodes fabricated by connecting alloys with different compositions in parallel were observed under a microscope while convective voltammetry was performed. On the non-uniform alloy surface, the concentration of the current in the easily soluble regions caused the deposition of copper sulfate to progress sequentially, leading to passivation.
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Free Research Field |
金属生産工学
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Academic Significance and Societal Importance of the Research Achievements |
電気自動車や電気電子機器には銅をはじめとした非鉄金属が使用されており,資源を確保するためのリサイクルが重要となる.しかし,リサイクル原料は鉱石と異なる組成を有するため,既存の製錬技術をそのまま用いることはできない.とくに電気電子機器に含まれる Ag および Sb は銅の電解精製を妨げることが知られる.本研究では製錬過程におけるこれら不純物元素の挙動を明らかにするために,Ag および Sb を高濃度に含んだ銅合金の凝固組織を理解するとともに,不均一な組織を有するアノードの不動態化過程を観察し,リサイクルプロセスを開発するための基礎的な知見を得た.
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