Refining and Utilization of Rare Earth Elements from Phosphors in Waste Fluorescent Lamp

废荧光灯荧光粉中稀土元素的提炼及利用

• 批准号: 11793009
• 负责人: HIRAJIMA Tsuyoshi
• 金额: $ 2.3万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for University and Society Collaboration
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11793009/
• 关键词: 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

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 … More 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

为建立荧光灯废弃物中稀土组分的回收体系，研究了荧光粉泥的分离和酸浸行为。首先，采用重介、水力、气流、重选和浮选等方法研究了磷泥中稀土组分和磷酸钙的分离特性。新开发的重介质分离方法显示出最高的稀土荧光粉分离效率、回收率和品位，其次是气动分离。磷渣经气流分选后，在不同的酸性溶液和氢氧化钠溶液中浸出稀土组分。为了回收浸出液中的可溶性组分，采用氢氧化物沉淀和草酸盐沉淀等处理工艺回收稀土组分。采用三种工艺从荧光灯废荧光粉渣中有效回收钇和铕 ...更多信息 包括气流分离法、硫酸浸出法和草酸盐沉淀法。回收率为65%，纯度为98.2%。研究了以废荧光灯处理后的荧光粉渣为原料合成Y_2O_3：Eu^<3+>的合成方法和烧结条件，确定了以废荧光灯处理后的荧光粉渣为原料合成Y_2O_3：Eu^<3+>的方法。Y_20_3：采用1.5mol/L硫酸浸取、氢氧化物沉淀、草酸盐沉淀、冷冻干燥、最佳烧结条件制备Eu^3+，烧结温度为1200℃，烧结时间为40 h，添加1%的硼酸钡作助熔剂。Y_20_3：以磷渣为原料合成的Eu^<3+>粉体具有良好的晶体结构，粒径在0.2 μm以上，且50%的粒径在5-6 μm之间。结果表明，以荧光粉渣为原料合成的Y_2O_3：Eu^<3+>粉末可以作为稀土红色荧光粉使用。少

项目成果

高橋 徹: "風力分級および硫酸浸出法による廃蛍光体スラッジからの希土類元素の分離回収"資源と素材. 117. 579-585 (2001)

高桥彻：“风力分级和硫酸浸出法从废磷污泥中分离回收稀土元素”资源与材料。

Tsuyoshi Hirajima: "Separation Performance of Zigzag Air Classifier"Proceedings of 6th Int.Symp.East Asian Recycling Technology. 759-764 (2001)

Tsuyoshi Hirajima：“锯齿形空气分级机的分离性能”第六届国际东亚回收技术会议论文集。

Touru Takahashi: "Synthesis of Rare Earth Phosphor from Phosphor Sludge in Processing Plant of Waste Fluorescent Lamp"Reports of Hokkaido Industrial Research Institute. No. 300. 1-8 (2001)

高桥彻：《从废荧光灯处理厂的荧光粉污泥中合成稀土荧光粉》北海道工业研究所的报告。

Tsuyoshi Hirajima: "Separation Performance of Zigzag Air Classifier"Proceedings of 6th Int. Symp. East Asian Recycling Technology. 759-764 (2001)

Tsuyoshi Hirajima：“之字形空气分级机的分离性能”第六届国际会议论文集

平島剛: "ジグザグ風力選別機によるPET樹脂フレーク回収のオンラインモニタリング"第11回廃棄物学会研究発表会講演論文集. I. 445-447 (2000)

Tsuyoshi Hirashima：“使用锯齿形风力分选机在线监测 PET 树脂薄片回收”第 11 届日本废物管理学会研究会议记录 I. 445-447 (2000)。