| Project/Area Number |
22560767
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Catalyst/Resource chemical process
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| Research Institution | Sendai National College of Technology |
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Principal Investigator |
SATOH Tomoaki 仙台高等専門学校, マテリアル環境工学 科, 教授 (70261584)
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2012: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2010: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | メカノケミカル / 有価金属 / コンバージミル / 回収率 / メディアン径 / 酸濃度 / 酸溶出 / ITO / インジウム |
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| Research Abstract |
In order to develop a recovery system for valuable rare metals from industrial wastes in unheated treatment, mechanochemical(MC) grinding process by an intensive ball “converge” mill were performed for several materials containing rare metals, and dissolution behaviors of MC treated powders in acid solution were examined. For indium oxides ? tin oxides (ITO) glass, high rate of elution over 80 % was attained in dissolution conditions (30 min, ambient temperature) at low 2.5 mol/dm3 of hydrochloric and nitric acids and at 2 ? 20 min of MC treatment time. For neodium based and samarium based permanent magnets, relationship between the particle diameter by MC treatments and the rate of elution of (Nd, Sm) into nitric acid solutions was not clearly found, although the elution rate of (Nd, Sm) for MC treated powders with an intensive converge mill was different from with a planetary ball mill. The rate of valuable metal elution (24 h, ambient temperature) over 80 % from MC grinded poders was obtained in elution conditions over 5.0 mol/dm3 of nitric acid concentration for neodium based permanent magnets, and was obtained over 0.5 mol/dm3 of nitric acid concentration for samarium based permanent magnets. As the rate of valuable metal elution was less than 40 % for bulk samples which was not MC treated, mechanochemical grinding process with an intensive ball converge mill was effective for recovery of rare elements from industrial wastes.
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