隨著半導體材料、觸媒及核子應用的興盛，稀有金屬如銦(In)、鎵(Ga)、鈀(Pd)和鍶(Sr)，是不可或缺且廣泛運用於製造過程中的。然而我們對其於自然環境中的命運與傳播途徑，及其對生態系統和人體健康的衝擊所知甚少。本次研究目的是藉由分散氣體浮選法(Dispersed air flotaion)來探討銦、鎵、鈀和鍶的水中物種(speciation)、溶解度及浮選分離效果。銦在pH值範圍 6.0到9.8間為極難溶；鎵則在pH值範圍 4.9到5.8間為極難溶。此兩種金屬皆在上述pH值範圍以外偏酸或偏鹼的情況下有較高的溶解度。除此之外是鍶(1.62 mM)在酸性至pH值 11.5的範圍內皆極易溶解，在pH值 12.5時有相當程度地沉澱(37.33%)。鈀在水中是極難溶的，且氯做為錯合物配位基會對其溶解度造成極大的影響。本研究之浮選分離法可以準一階(pseudo-first-order)動力模式描述，其分離速率隨氮氣流量增加而增加，同時離子強度會些微干擾這些金屬的浮選分離效率。分離效率亦受不同的收集劑(collector)及劑量影響，十二烷基硫酸鈉(SDS)較適合用來去除銦、鎵及鍶。溴化十六烷基三甲銨(CTAB)在去除銦、鎵及鍶上效果較差，用於鈀的分離則有較佳的結果。這些結果將基於銦、鎵、鈀和鍶的物種、溶解度做討論。浮選分離的主要機制為收集劑與目標化合物的靜電交互作用。

With the rise in semiconductor materials, catalysts, and nuclear applications, rare metals are essential and they have been used in production processes, e.g., indium (In), gallium (Ga), palladium (Pd), and strontium (Sr).However, little is known on their fate and transport in the environment, or the impact on the ecosystems and human health.The objectives of the study are to examine solubility and speciation, and flotation separation of these metals via dispersed air flotation (DiAF). In was highly insoluble in pH range of 6.0-9.8, and Ga in pH 4.9-5.8; and both were more soluble as pH became more acidic or more alkaline. On the other hand, Sr (1.62 mM) was highly soluble from acidic pH to highly alkaline pH (11.5) and moderately precipitated (37.33%) at pH 12.5. Pd was highly insoluble and its solubility was critically affected by chloride as a ligand for complexation. It was found that flotation separation could be described by pseudo-first-order kinetic model and its rate constant increased with increasing N2 flow rate.Ionic strength slightly hindered flotation separation efficiency of these metals. Removal efficiencies of these metals were affected by types of collectors and collector dose. While sodium dodecyl sulfate (SDS) facilitated the removal of In, Ga, Sr, cetyl trimethyl ammonium bromide (CTAB) was not an effective. However, CTAB was effective on separation of Pd. These effects were discussed based on the speciation and solubility of In, Ga, Pd and Sr.The main mechanism of flotation separation was the electrostatic interaction of collectors and target compounds.

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