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標題: | 貴重金屬回收程序探討 Recovery of noble metal |
作者: | Chih-Hsieh Lee 李致諧 |
指導教授: | 王大銘(Da-Ming Wang) |
關鍵字: | 金屬離子,濃縮,回收程序,萃取,反萃取, Metal ions,Concentration,Recovery,Extraction,Stripping, |
出版年 : | 2007 |
學位: | 碩士 |
摘要: | 近年來隨著資訊科技產業蓬勃興起,使液晶顯示器的需求量大增。同時隨著能源短缺及環保意識高漲,太陽能光電產業成長快速,使銦的需求大幅成長。本研究之主要目標,在於開發出可用來回收水溶液中低濃度銦離子的技術,並將其濃縮至後續製程可以使用的濃度。
本研究之進料溶液的銦離子濃度為200 ppm,研究中選擇酸性萃取劑-二(2-乙基已基)磷酸(Di(2-ethylhexyl) phosphoric acid, D2EHPA)為萃取劑,以Isopar-L為稀釋劑,利用具分散反萃取相支撐式液膜(Supported Liquid Membranes with Strip Dispersion, SLMSD)來回收銦離子。實驗結果顯示:當萃取劑濃度為0.6 M時,利用具分散反萃取相支撐式液膜可以將水溶液中的銦離子濃度由200 ppm降至2 ppm以下,其處理的速率大約為7.7 L/hr,並可同時將回收液中銦離子之濃度濃縮至20,000 ppm以上。 Along with the development of information technology, the demand of liquid crystal displays (LCD) has increased in the last few years. Meanwhile, solar photoelectric industry is broadly studied due to energy crisis and awareness of environmental protection, and this leads to high demand of indium. The main purpose of this research is to develop a process which can recover indium ions from an aqueous solution and then concentrate it to a value that they can be further used. The feed solution used in this research contained 200 ppm indium ions. Indium ions were recovered by the process of supported liquid membrane with strip dispersion (SLMSD), with extractant D2EHPA, diluent Isopar-L, and strip solution 5 M HCl aqueous solution. By using an extractant concentration of 0.6 M, the indium concentration in the feed solution was reduced from 200 ppm to less than 2 ppm at a treatment rate of 7.7 l/hr, and the indium concentration in the strip solution was easily concentrated to higher than 20000 ppm. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/24988 |
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顯示於系所單位: | 化學工程學系 |
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