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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 of rare earth elements from waste CRT phosphors, this experiment used a combination of high temperature alkaline fusion and acid leaching to treat the abandoned CRT phosphors. The effects of calcination temperature, alkaline-to-slag ratio and calcination time on the leaching rate of rare earth elements influences. X-ray diffractometry, scanning electron microscopy and laser particle size distribution were used to characterize the phase, morphology and particle size of the substances before and after melting. The experimental results show that the rare earth elements contained in the waste CRT phosphor are Y and Eu, the content of rare earth oxide is as high as 26.79%, and the recovery value is very good. The ratio of the alkaline residue to the phosphoric acid is 4:1, the calcination temperature is 700 ℃ and the calcination time is 30 min can effectively destroy the phase composition of waste CRT phosphors, the rare earth elements Y and Eu leaching rate of 99.7%.