This study investigates two phosphor samples with three processing routes to extract rare earth elements (REE). Acid leaching in 2 M HCl, 80 °C, 1 h yielded higher REE extraction in the compact fluorescent lamp (CFL) feed (82% Eu), with varying rare earth (RE) purity (77–97%) compared to fluorescent tubelight (TL) feed (69% Eu, 98–95% purity). Mechanical activation (MA) of 30 and 60 min caused partial dissociation of the LAP (LaPO₄:Ce³⁺Tb³⁺) phase and yielded 34% Ce, 36% Tb, and 40% La. Transmission electron microscopy results revealed the formation of polycrystalline sites, which improved RE recovery. Alkali baking showed better REE extraction for both phosphors. 86.5% Y, 69% Eu was selectively extracted in feed acid leaching, and 100% La, 60% Tb, 20.6% Eu after alkali baking with 97% purity and CeO₂ in the leach residue. The acid baking route was preferred for CFL phosphor with 91% REE (43 % Tb) extraction and 98% purity. TL phosphor was better for Tb extraction. The alkali baking of TL feed and acid baking of CFL feed yields 37.7% and ∼30% rare earth oxides, respectively.

本研究调查了两种荧光粉样品，采用三种工艺路线提取稀土元素 (REE)。与荧光灯管灯相比，在 2 M HCl、80 °C、1 小时中酸浸出紧凑型荧光灯 (CFL) 进料 (82% Eu) 中的 REE 提取率更高，稀土 (RE) 纯度 (77–97%) 不同(TL) 进料（69% Eu，98–95% 纯度）。30 和 60 分钟的机械活化 (MA) 导致 LAP 部分解离 (LaPO ₄ :Ce ³⁺ Tb ³⁺) 相并产生 34% Ce、36% Tb 和 40% La。透射电子显微镜结果显示多晶位点的形成，这提高了 RE 回收率。碱烘烤对两种荧光粉都显示出更好的 REE 提取率。进料酸浸选择性提取86.5% Y、69% Eu，碱焙后提取100% La、60% Tb、20.6% Eu，浸出渣中纯度97%，CeO ₂。对于具有 91% REE (43% Tb) 提取和 98% 纯度的 CFL 荧光粉而言，酸烘烤路线是优选的。TL 荧光粉更适合 Tb 提取。TL饲料的碱烘烤和CFL饲料的酸烘烤分别产生37.7％和~30％的稀土氧化物。