微波辅助加热浸出废荧光粉中稀土氧化物实验研究

采用微波辅助加热, 研究了硫酸从废弃荧光粉中浸出稀土元素的工艺, 考察了硫酸浓度、液固比、浸出温度及浸出时间对浸出稀土的影响。实验结果表明;采用微波辅助硫酸浸出废荧光粉, 稀土元素的回收率分别为;Y₂O₃ 90%~98%, Eu₂O₃ 80%~90%, CeO₂ 26.16%, Tb₄O₇ 22.5%。CeO₂、Tb₄O₇、Al₂O₃和MgO浸出率较低, 变化规律一致。液固比和浸出时间对Y₂O₃和Eu₂O₃浸出率的影响较大, 硫酸浓度和浸出时间对CeO₂和Tb₄O₇浸出率的影响较大, 浸出温度对各组分的浸出率影响不显著。

Experimental Research on the Microwave-assisted Acid Leaching of REOs from Waste Fluorescent Powder

An experiment was conducted on leaching of rare earth from waste fluorescent powder with sulfuric acid, which was assisted by microwave heating. Effects of sulfuric acid concentration, liquid to solid ratio, reaction temperature and reaction time on rare earth leaching were explored. The results showed that the microwave-assisted acid leaching of rare earth from waste fluorescent powder resulted in following recoveries of elements: Y₂O₃ (90%~98%), Eu₂O₃(80%~90%), CeO₂(26.16%), Tb₄O₇(22.5%). However, the leaching rates of CeO₂, Tb₄O₇, Al₂O₃ and MgO appeared to be low with the same changing rule. Besides, the liquid/solid ratio and leaching time brought larger influence on the leaching of Y₂O₃ and Eu₂O₃, while the sulfuric acid concentration and leaching time gave greater impact on the leaching of CeO₂ and Tb₄O₇. It was found that leaching temperature had no significant effect on the leaching efficiency of components.