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首页> 外文期刊>Minerals Engineering >Recovering rare earths and aluminum from waste BaMgAl10O17:Eu2+ and CeMgAl11O19:Tb3+ phosphors using NaOH sub-molten salt method
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Recovering rare earths and aluminum from waste BaMgAl10O17:Eu2+ and CeMgAl11O19:Tb3+ phosphors using NaOH sub-molten salt method

机译：从废Bamgal107017中恢复稀土和铝：Eu2 +和Cemgal11O19：Tb3 +磷光体使用NaOH亚熔融盐法

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摘要

In this study, a novel process was developed for recovering rare earth elements and Al from the waste BaMgAl10O17:Eu2+ and CeMgAl11O19:Tb3+ phosphors using NaOH sub-molten salt method. By sub-molten salt method, the spinel structures of blue and green phosphors can be decomposed, Al can be extracted into the solution, and after leaching by HCl solution, the rare earth elements present in the sub-molten salt residues can also be efficiently extracted into the leach solution. Influence of reaction temperature, reaction time, alkali-to-residues mass ratios and the NaOH concentration in the sub-molten salt process affecting on leaching rate of rare earths and Al were investigated to obtain an optimum condition. Maximum leaching rate of Al (99.39%) Ce (96.47%), Tb (92.23%) and Eu (82.43%) was obtained at the condition: NaOH initial concentration 70% (omega), 280 degrees C temperature and 4 h of reaction time and 4:1 alkali-to-residues mass ratios. After removing impurities and roasting, the Al2O3 products (79.67%) and the RE oxides (94.12%) were obtained eventually.
机译：在该研究中，开发了一种新方法，用于从废Bamgal1017中回收稀土元素和Al，使用NaOH亚熔融盐法从废Bamgal1017：Eu2 +和Cemgal11019：Tb3 +磷光体中进行。通过亚熔融盐法，蓝绿磷光体的尖晶石结构可以分解，Al可以萃取到溶液中，并通过HCl溶液浸出后，存在于亚熔融盐残基中的稀土元素也可以有效提取到浸出溶液中。研究了反应温度，反应时间，碱 - 残基大量的影响和亚熔融盐过程中影响稀土和Al浸出速率的亚熔盐过程中的NaOH浓度，得到最佳条件。 Al（99.39％）Ce（96.47％），Tb（92.23％）和Eu（82.43％）的最大浸出率在条件下获得：NaOH初始浓度70％（ω），280℃，4小时的反应时间和4：1碱 - 残留量大量比例。除去杂质和焙烧后，最终获得Al 2 O 3产品（79.67％）和再氧化物（94.12％）。

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