2023 Fiscal Year Final Research Report
Prevention of Passivation in Electro-refining of Crude Copper Containing High Impurities by Periodic Reversal Current Electrolytic Method
| Project/Area Number |
20K05180
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 26060:Metals production and resources production-related
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| Research Institution | Akita University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
金児 紘征 秋田大学, 名誉教授, 名誉教授 (20006688)
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | 銅電解精製 / アノード不動態化 / ガルバニック腐食 / その場観察 |
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| Outline of Final Research Achievements |
Recycled raw materials are also processed in copper smelting. However, as the amount of recycled material increases, some impurities may cause passivation during the electrolysis process, which has negative effects. The objective of this study was to find a method to prevent passivation, and the dissolution reaction of copper in copper electrolysis was considered to be a reaction between copper and impurities by galvanic couples. In the experiments, samples of copper wire winding with various metal wires were used, and the electrochemical behavior was measured and observed in-situ with a stereo microscope placed above the sample. As a result, although the impact of the current application method could not be investigated due to the effects of COVID-19, we were able to capture the electrochemical effects of impurities on the anodic reaction in a simple and visual manner and observe changes on the electrode surface that do not appear in the electrochemical measurement results.
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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 |
銅は今後需要が増加する重要な素材であり、リサイクル原料からの回収が求められている。しかし、銅電解精製工程においてはリサイクル原料処理量の増加が不純物量を増やし、不動態化現象を引き起こす。本研究は銅電解精製における陽極を銅と不純物のガルバニック対とみなし不動態化の抑制を目的とした研究を行ったことに特徴がある。さらに、銅線に各種金属線を巻き付けた電極を用い電気化学計測と試料表面の直接観察を組み合わせることで、不純物の影響を視覚的に捉えることができる簡便な実験方法を開発した。本方法により電気化学的な挙動を測定しながら電極表面の変化を観察しかつ不純物の影響をより明確にできた。
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