从废弃CRT荧光粉中熔浸稀土元素的研究  

Leaching of Rare Earth Elements from Waste Fluorescent Powder of Cathode Ray Tube by Molten Salts

作　　者：吴玉锋[1] 贾平平[2] 王维[1] 王宝磊[1] 章启军[1] 

机构地区：[1]北京工业大学循环经济研究院,北京100124 [2]北京工业大学材料科学与工程学院,北京100124

出　　处：《中国稀土学报》2013年第6期723-728,共6页Journal of the Chinese Society of Rare Earths

基　　金：国家高技术研究发展计划(2012AA063207);北京市属高等学校人才强教深化计划"中青年骨干人才培养"项目(PHR20110843);北京工业大学科研基地建设--科技创新平台项目(033000546613001);北京工业大学第11届研究生科技基金(ykj-2012-8910)资助

摘　　要：为了实现废弃CRT荧光粉中稀土元素的高效浸出,本实验采用高温碱熔加酸浸相结合的方法处理废弃CRT荧光粉,主要考察了煅烧温度、碱渣比及煅烧时间对稀土元素浸出率的影响。并采用X射线衍射仪、扫描电子显微镜和激光粒度分布仪对碱熔前后的物质进行物相、形貌和粒度表征。实验结果表明:废弃CRT荧光粉中所含稀土元素为Y和Eu,稀土氧化物含量高达26.79%,极具回收价值;在碱渣比为4∶1,煅烧温度为700℃,煅烧时间为30 min时能够有效破坏废弃CRT荧光粉物相组成,使稀土元素Y和Eu浸出率达到99.7%以上。In order to achieve efficient leaching rate of rare earths from waste phosphors in cathode ray tube （CRT） , a method of combining high-temperature alkali fusion and acid leaching was studied. The effects of the calcination temperature, the alkali-to-slag mass ratio and the calcination time on the leaching rate of rare earths were mainly investigated. The phase structure, surface morphology, particle size of material before and after alkali fusion were characterized by X-ray diffraction, scanning electron microscope and laser particle sizer. The results showed that the waste phosphors in CRT contained Y, Eu, and rare earth oxide up to 26.79%, so it is of great value in recovery. When calcination temperature was 700 ℃, the alkalito-slag mass ratio was 4： 1, and when the calcination time was 50 min, the phase compositions of waste phosphors in cathode ray tube could be changed and converted to leaching rate substances easily react with acid, the of Y and Eu reaches more than 99.7%

关 键 词：废弃CRT荧光粉 高温碱熔 酸浸 稀土 

分 类 号：X799.3[环境科学与工程—环境工程]