2014 Fiscal Year Final Research Report
Composition Optimization of Silicate Slag for Rare-earth Recycling
| Project/Area Number |
24560911
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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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| Research Field |
Metal making engineering
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| Research Institution | Ehime University |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Keywords | ケイ酸塩スラグ / リン酸 / レアアース回収 / 光学特性 / 組成 / 溶出試験 / 赤外分光 |
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| Outline of Final Research Achievements |
In phospho-silicate slags, the composition condition, at which rare-earth elements are bonded selectively with PO4 tetrahedra, is [R2O+R'O]/[P2O5]≦1 in molar ratio, where R is the alkali metal and R' is the alkaline-earth metal. The structure of PO4 networks was characterized by infrared spectroscopy for optimized slag compositions. ICP-MS analysis revealed that rare-earth element and phosphate species were selectively dissolved into ultra-pure water by elution tests.
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| Free Research Field |
非鉄製錬学
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