共沈法を用いた廃蛍光体スラッジからの赤色蛍光体(Y_2O_3 : Eu^<3+>) の合成 Synthesis of Red Phosphor(Y_2O_3 : Eu^<3+>) from Waste Phosphor Sludge by Coprecipitation Process

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著者

    • 高橋 徹 TAKAHASHI Touru
    • 北海道立工業試験場環境エネルギー部分析応用科 Department of Environment and Energy, Hokkaido Industrial Research Institute
    • 高野 明富 TAKANO Aketomi
    • 北海道立工業試験場環境エネルギー部分析応用科 Department of Environment and Energy, Hokkaido Industrial Research Institute
    • 長野 伸泰 NAGANO Nobuhiro
    • 北海道立工業試験場環境エネルギー部分析応用科 Department of Environment and Energy, Hokkaido Industrial Research Institute
    • 平井 伸治 HIRAI Shinji
    • 室蘭工業大学工学部材料物性工学科 Department of Materials Science and Technology, Muroran Institute of Technology

抄録

The coprecipitation behaviors of leaching solution and their sintering conditions have been examined to synthesize red phosphor (Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup>) from phosphor sludge contained in waste fluorescent lamp. At first, the recovery of rare earth elements and the removal of impurity in the leaching solution were investigated by treatment processes such as hydroxide and oxalate precipitations. The drying process of coprecipitation reaction product was examined by freeze-dry and air-dry. The synthesis behavior of red phosphor (Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup>) was also investigated by changing some factors such as temperature, time and flux. The experimental results obtained are summarized as follows:<BR>(1) The homogeneous Y and Eu oxalate precipitations were produced by adding oxalic acid into leaching solution under the dispersion using ultrasonic stirring and the desiccation using freeze-dry.<BR>(2) Y and Eu precipitations were sintered at 1,473 K for 144 ks under the addition of 1 % barium borate as a flux. Red phosphor (Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup>) sintered had crystal size more than 0.2<i>μ</i>m and average particle size of 5-6<i>μ</i>m.<BR>(3) Impurity elements in leaching solution were efficiently removed by hydroxide precipitation process, in which leaching solution was retained at less than pH 5.0 and by oxalate synthesis process, in which oxalic acid was added to use 3 times the molar quantity of Y and Eu hydroxides. In these treatments, recovery of Y and Eu were about 85 %, respectively.<BR>(4) Synthesis process of red phosphor (Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup>) from waste phosphor sludge contained in fluorescent lamp was established by using simulate leaching solution. On the basis of these treatment methods, rare earth powder of red phosphor was synthesized from waste phosphor sludge.<BR>Luminescence properties of rare earth powder synthesized were in fairly agreement with these of commercial red phosphor. Rare earth powder synthesized in this work may be used substantially as a red phosphor.

収録刊行物

  • 資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan

    資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan 118(5), 413-418, 2002-06-25

    The Mining and Materials Processing Institute of Japan

参考文献:  14件中 1-14件 を表示

被引用文献:  1件中 1-1件 を表示

  • 蛍光体の液液分離

    大槻 晶 , 藤田 豊久 , 定木 淳 , 梅光 軍 , 柴山 敦 , 松田 光明 , 川井 隆夫

    春季大会講演集. I, 資源編 16(2), 27-28, 2004-03-29

    参考文献3件

各種コード

  • NII論文ID(NAID)
    10008852308
  • NII書誌ID(NCID)
    AN10062646
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09161740
  • NDL 記事登録ID
    6191422
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-315
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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