本實驗探討以電透析程序自酸性水溶液中去除銦的可行性。在硫酸介質中以不同酸鹼值及銦濃度了解其對銦去除率及回收率之影響，並評估其反應機制。其中嘗試將陽離子膜浸泡於含銦溶液中進行前處理，以減少吸附造成之誤差，並在延長操作時間下，了解沉澱行為對去除率與回收率之影響。在硝酸介質中則以定電壓操作來避免分離程序中水解離的可能，並藉由提高銦離子/質子比率來獲得較佳的回收率。再以強酸進行第二次電透析再配合酸洗來避免吸附及沉澱對質量守恆計算上的干擾。最後將雙極膜導入電透析中，以其所持續產生的氫離子將淡極液的酸鹼值維持於酸性，以避免銦的沉澱。
在本實驗中，水中銦離子與質子的競爭導致淡極液中酸鹼值的上升及較低的去除率表現，且酸鹼值的上升可能會使銦在分離過程中產生氫氧化物沉澱。另外，銦離子在分離過程中需先行吸附於陽離子交換膜上，進一步被其他陽離子取代，再脫附至濃極液；如此導致回收率及質量平衡計算上的偏差，是批次操作中不可避免的。過高的銦離子/質子比率導致銦並未被回收至濃極液中。我們藉由第二次電透析成功再生陽離子交換膜，並將銦離子回收至濃極液中，並在酸洗後成功驗證系統質量守恆。雙極膜試驗中，即使整體溶液得以維持於酸性條件，氫離子於接近膜表面的濃度極化現象會導致局部的酸鹼值上升，致使銦沉澱於離子交換膜表面，影響質量守恆的計算。

In this study, the feasibility of indium removal by electrodialysis (ED) and electordialysis with bipolar membrane (EDBP) was investigated. Effects of pH and In concentration in sulfate medium were examined. Possible mechanism was inferred from results of recovery ratio and removal rate. To eliminate influence of adsorption, the cation exchange membrane was pretreated by soaking in indium solution, and the duration was prolonged to investigate the influence of precipitation on removal rate and recovery ratio. In experiments with nitrate medium, operation under constant potential was carried out to avoid the water splitting. Ratio of In3+/H+ was raised to obtain better recovery ratio. Second electrodialysis with strong acid and acid wash were carried out to eliminate the influences of adsorption and precipitation. To maintain the pH at acidic condition in dilute stream, bipolar membrane was introduced in the system to provide sufficient amount of protons.
The competition between indium and protons during ED process resulted in an increase of pH in dilute stream and lower removal rate. The increase of pH may cause the formation of indium hydroxide precipitate. In addition, the separation of indium was based on a series of absorption and desorption on the membranes. This mechanism strongly affected the quantitative analysis of indium. First electrodialysis with excessive ratio of In3+/H+ showed no increase of indium in concentrate stream. Indium was successfully collected in concentrate by regeneration of cation exchange membrane with second electrodialysis, and satisfactory mass conservation was observed after acid wash. From results of EDBP process, the concentration polarization of protons caused the regional precipitation of indium near the surface of membrane. It affected the calculation of mass conservation.

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