| Project/Area Number |
16K14443
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Metal making/Resorce production engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
Waseda Yoshio 東北大学, 多元物質科学研究所, 名誉教授 (00006058)
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| Co-Investigator(Kenkyū-buntansha) |
篠田 弘造 東北大学, 多元物質科学研究所, 准教授 (10311549)
助永 壮平 東北大学, 多元物質科学研究所, 准教授 (20432859)
柴田 浩幸 東北大学, 多元物質科学研究所, 教授 (50250824)
打越 雅仁 東北大学, 多元物質科学研究所, 准教授 (60447191)
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 高融点金属分離回収 / 廃棄物からのリサイクル / 溶融塩電解 / X線吸収分光 / 溶融塩 / 局所構造 / 金属の電解回収 / 核磁気共鳴 / ハロゲン化物溶融塩 / 金属生産工学 / 高融点有価金属回収 / 廃棄物再資源化 / 融体局所構造 |
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| Outline of Final Research Achievements |
The purpose of this study was to obtain fundamental knowledge leading to the establishment of the technique of refractory metals recovery from molten salt with electroplating by comparing the local structure in the molten state with the results of the electrolytic recovery experiment. The relationship between the molten salt composition and the melting temperature and the local structure was investigated and clarified based on the data obtained by the in-situ measurement in the high temperature molten state mainly applying X-ray absorption spectroscopy.
It has been found that, by using a molten salt of mixed halide composition in which a part of the low melting point fluoride is substituted with chloride, a large structure is decomposed and metal can be recovered even under relatively low temperature conditions.
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| Academic Significance and Societal Importance of the Research Achievements |
これまで回収困難であった高融点金属の回収に溶融塩電解を適用するにあたり、塩組成を調整することによって電解温度の低温化、および得られる電析物の緻密化・平滑化が実現可能という指針を得ることができた。
このような成果を挙げるには、多元系試料中の目的金属元素周囲の局所構造を原子レベルで解析可能なX線吸収分光の適用、さらに高温溶融状態におけるその場測定を実施する工夫が重要であり、本研究でそれを実現した。
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