由於稀土元素應用廣泛、供應不確定、需求旺盛，包括釔在內的稀土元素的可持續利用已成為一項重要任務。因此，從電子廢棄物和廢水中開發其回收技術至關重要。本研究的目的是檢查 釔 與 釔-螯合基錯合物的溶解度和形態，以及模擬稀土元素處理過程中產生的溶液通過分散式浮除法分離這些金屬。釔在酸鹼值為 7.4-11.2 的範圍內是高度不溶的，並且隨著 酸鹼值變得更酸性或更鹼性而更易溶解。發現浮除分離可以用擬一級動力學模型描述，其速率常數隨著氮氣流量的增加而增加。離子強度阻礙了這些金屬的浮除分離效率。 釔的回收效率受捕收劑類型和捕收劑劑量的影響。十二烷基硫酸鈉 (SDS) 促進了釔Y 的回收，而十六烷基三甲基溴化銨 和 Triton X-100無效。基於 Y-SDS 複合物的形成討論了這些影響。在酸鹼值 4.03 時浮選分離的主要機制是 Y(DS)2+、Y(DS)2+、Y3+ 和 Y(DS)3 的游離 DS- 和陽離子物質之間的靜電相互作用。 釔在 酸鹼值6.54 時作為 Y-SDS 複合物（Y(DS)2+、Y(DS)2+、Y(DS)3、Y(OH)2DS、Y(OH)(DS)2 和 Y(OH)DS3-)。 酸鹼值8.45 時的浮選分離是離子浮選和沉澱浮選的組合。 在酸鹼值 9.87時Y(OH)3(s)為主要物質，且SDS 有效地將其分離。

Due to their wide applications, uncertainties in supply and high demand, sustainable utilization of rare earth elements (REEs), including yttrium (Y), has become an important task. The development of its recovery technology from e-waste and wastewater is therefore critical and essential. The objectives of this study are to examine solubility and speciation of Y and Y-ligand complexes, and flotation separation of these metals via dispersed air flotation (DiAF), which simulates the solutions generated in processing of REEs. Yttrium was highly insoluble in pH range of 7.4-11.2, and was more soluble as pH became more acidic or more alkaline. It was found that the flotation separation could be described by pseudo-first order kinetic model and its rate constant increased with increasing N2 flow rate. Ionic strength hindered flotation separation efficiency of these metals. Recovery efficiency of Y was affected by types of collectors and collector doses. While sodium dodecyl sulfate (SDS) facilitated the recovery of Y, cetyl trimethyl ammonium bromide (CTAB) and triton X-100 (TX-100) were not effective. These effects were discussed based on the formation of Y-SDS complexes. The main mechanism of flotation separation at pH 4.03 was electrostatic interaction between free DS- and cationic species of Y(DS)2+, Y(DS)2+, Y3+, and Y(DS)3. Yttrium was recovered at pH 6.54 as Y-SDS complexes (Y(DS)2+, Y(DS)2+, Y(DS)3, Y(OH)2DS, Y(OH)(DS)2, and Y(OH)DS3-). The flotation separation at pH 8.45 was the combination ion flotation and precipitate flotation. Y(OH)3(s) was the dominant species at pH 9.87, and SDS effectively separated it.

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