| Project/Area Number |
11793009
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| Research Category |
Grant-in-Aid for University and Society Collaboration
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| Allocation Type | Single-year Grants |
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| Research Field |
資源開発工学
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
HIRAJIMA Tsuyoshi Hokkaido Univ., Graduate School of Eng, Associate Professor, 大学院・工学研究科, 助教授 (00175556)
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| Co-Investigator(Kenkyū-buntansha) |
SASAKI Keiko Otaru University of Commerce, Associate Professor, 商学部(環境科学), 助教授 (30311525)
HIROYOSHI Naoki Hokkaido Univ., Graduate School of Eng, Instructor, 大学院・工学研究科, 助手 (50250486)
TSUNEKAWA Masami Hokkaido Univ., Graduate School of Eng, Professor, 大学院・工学研究科, 教授 (40002026)
NAGANO Nobuhiro Hokkaido Industrial Research Institute, Chief of Analytical Chemistry Section, 分析技術科, 分析技術科長
TAKAHASHI Touru Hokkaido Industrial Research Institute, Researcher, 分析技術科, 研究職員
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| Project Period (FY) |
1999 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2001: ¥3,600,000 (Direct Cost: ¥3,600,000)
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| Keywords | Fluorescent Lamp / Rare Earth Phosphor / Processing and Separation / Recycling / Sulfuric Acid Leaching / Coprecipitation / Rare Earth Elemnets / Synthesis / 廃蛍光管 / 重液選別 / 風力選別 / Multi-Gravity Separator / 浮選 / カイクロン / 高純度化 / 再合成法 / 希土類蛍光管 / 溶媒抽出 / 侵出 / 等電点 |
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| Research Abstract |
The separation and acidic leaching behaviors of phosphor sludge have been examined to establish the recycling system of rare earth components contained in fluorescent lamp waste. At first, separation characteristic of rare earth components and calcium phosphate in phosphor sludge was investigated by heavy media separation, hydro separation, pneumatic separation, gravity separation and flotation. Newly developed heavy media separation method showed highest separation efficiency, recovery and grade of rare earth phosphors and the pneumatic separation was the second result. After pneumatic separation of phosphor sludge, rare earth components were leached in various acidic solutions and sodium hydroxide solution. For recovery of soluble component in leaching solution, rare earth component was recovered by treatment processes such as hydroxide and oxalate precipitations. Yttrium and europium from phosphor sludge contained in fluorescent lamp waste were recovered effectively by three process
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es of pneumatic separation, sulfuric acid leaching and oxalate precipitation methods. Their recovery was finallv about 65%, and its purity was 98.2%. It was also found that separation and recovery of rare earth elements from the leaching solution by multistage countercurrent extraction were possible.
Synthesis method and sintering conditions have been examined to establish the synthesizing Y_20_3 : Eu^<3+> from phosphor sludge in processing waste fluorescent lamp. Y_20_3 : Eu^<3+> were synthesized by 1.5 mol/l sulfuric acid leaching, subsequent treatment processes such as hydroxide and oxalate precipitations, freeze-dry, and sintering in optimum condltions ; sintering temperature is 1200℃, sintering time is 40 hours, with addition of 1% barium borate as the flux. Y_20_3 : Eu^<3+> powder synthesized from phosphor sludge, was obtained well crystal structure of above 0.2 μm crystal size, and with 50% particle size in the range of 5-6 μm. It was found that Y_20_3 : Eu^<3+> powder synthesized from phosphor sludge by this work could be used substantially as a red rare earth phosphor. Less
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