The current study examines the extraction of rare-earth elements from trichromatic phosphor of discarded tube lights via baking processes. The Y₂O₃:Eu³⁺ (YOX) and BaMgAl₁₀O₁₇:Eu²⁺ (BAM) phases completely decomposed during acid and alkali baking with > 90% Eu and Y extraction. Prior, selective acid leaching of the YOX phase enhanced the acid baking process at a lower temperature (< 230 ℃). Feed acid baking showed a maximum 87% Tb, 36% La, and 17% Ce extraction at 500 °C, 0.5 h, 1 ml/g H₂SO_4, and alkali baking yielded 16.1% Tb, 86% La, and 73% Ce at 300 ℃, 0.5 h, 50 wt.% NaOH. The acid baking of the acid-leached phosphor yielded 72% Tb, 95% La, 63% Ce, ~ 95% Y, and Eu extraction at 300 °C, 0.5 h, 1.05 mL/g H₂SO₄. Lower Tb extraction during the acid baking of acid-leached phosphor can be attributed to the formation of Ba₃Tb(PO₄)₃ and BaTbO₃ phases. Insoluble Si₃Tb₅ phase formation and partial decomposition of CeMgAl₁₁O₁₉:Tb³⁺ (CMAT) phase in the alkali baking route leads to lower Tb extraction. The acid baking process is suitable for extracting Tb, Eu, and Y, whereas the alkali baking process is suitable for La and Ce. The thermal analysis of phosphor and flux interaction depicts that alkali baking is less energy-intensive than acid baking. In comparison, the one-step acid baking process and the two-step alkali baking process yielded desirable extraction results (87% Tb, total RE (rare earth) 78.5% and 50.4% Tb, total RE 59.3%). The product yield in the acid and alkali baking route of feed, acid-leach phosphor is 36%, 29%, and 39%, 28.2%, respectively, with ~ 98% mixed rare-earth oxide purity.

目前的研究检查了通过烘烤工艺从废弃管灯的三色荧光粉中提取稀土元素。Y ₂ O ₃ :Eu ³⁺ (YOX) 和 BaMgAl ₁₀ O ₁₇ :Eu ²⁺ (BAM) 相在 > 90% Eu 和 Y 萃取的酸碱烘烤过程中完全分解。此前，YOX 相的选择性酸浸增强了较低温度（< 230 ℃）下的酸烘烤过程。_{在 500 °C、0.5 小时、1 ml/g H 2} SO ₄条件下，饲料酸烘烤显示出最高 87% Tb、36% La 和 17% Ce 萃取率，在 300 ℃、0.5 h、50 wt.% NaOH 条件下，碱烘烤产生 16.1% Tb、86% La 和 73% Ce。在 300 ℃、0.5 小时、1.05 mL/g H ₂ SO ₄条件下，酸浸荧光粉的酸烘烤产生 72% Tb、95% La、63% Ce、~95% Y 和 Eu 。在酸浸荧光粉的酸烘烤过程中 Tb 萃取率较低可归因于 Ba ₃ Tb(PO ₄ ) ₃和 BaTbO ₃相的形成。不溶性Si ₃ Tb ₅相的形成和CeMgAl ₁₁ O ₁₉ :Tb ^{3+的部分分解}碱烘烤路线中的 (CMAT) 相导致 Tb 萃取率降低。酸焙工艺适用于提取 Tb、Eu 和 Y，而碱焙工艺适用于提取 La 和 Ce。荧光粉和助焊剂相互作用的热分析表明，碱烘烤比酸烘烤耗能低。相比之下，一步酸烘烤工艺和两步碱烘烤工艺产生了令人满意的提取结果（87% Tb，总稀土（稀土）78.5% 和 50.4% Tb，总稀土 59.3%）。酸浸料酸碱焙烧路线的产品收率分别为36%、29%、39%、28.2%，混合稀土氧化物纯度约98%。