本研究對顯示面板業中，以氧化鋅為基底之廢棄含鋅靶材（IGZO）進行金屬資源的分離及純化再生的技術開發與研究，以其中所含之銦、鎵為目的金屬。實驗主要分成三大部分，第一部分為廢棄含鋅靶材的物理前處理與酸溶浸出，藉由物理前處理的方式進行靶材鍍層（Coating layer）剝離，將鍍層粉末中銦之含量提升至約25 %，再以無機酸進行酸消化離子溶出之步驟，經酸消化處理之靶材粉末中銦、鎵金屬之溶出率可達99.5％以上。
由於所得之浸出液為含銦、鎵與高鋅濃度鋅之三元溶液，本研究之第二部分為金屬之純化分離，主要之方法為溶媒萃取，以有機磷酸鹽類D2EHPA做為萃取劑，對銦、鎵兩目的金屬進行選擇性萃取，鋅則留於萃餘液中。根據D2EHPA對金屬離子之選擇性，採用兩階段先銦萃取再鎵萃取之階段性操作流程，實驗結果顯示，銦與鎵之萃取率均可達到99.5 %以上，且三元金屬之分離係數（Separation factor）βIn/Ga、βIn/Zn、βGa/Zn分別為35478、27412與332.9，顯示三元金屬已藉由選擇性萃取達到分離之效果。萃取後存在於有機相中之金屬離子，再藉由反萃取使其回到水溶液中以利後續的金屬再生程序，以不同濃度之鹽酸作為銦與鎵之反萃取劑，反萃效率皆可達到99.9 %以上。
第三部分的金屬純化再生，根據產物的不同分為兩套研究步驟，第一部分為產生金屬氧化物之化學沉澱與煅燒流程，根據電位（Eh）與酸鹼值（pH）之關係圖，使用氫氧化鈉來調整溶液之酸鹼值，分別沉澱出金屬氫氧化物之固體，再藉由高溫煅燒的方式得到三氧化二銦（In2O3）、三氧化二鎵（Ga2O3）與氧化鋅（ZnO）產物，以儀器分析金屬氧化產物之純度，皆可達99.5 %以上。另一部分為產出純金屬之氧化還原置換與電解流程，利用不同金屬氧化還原電位之差異，使用活性較高的鋅粉、鋁粉作為還原劑，在還原劑過量之情況下得到較高的還原置換率，並利用銦、鎵熔點較低之特性將其與還原劑分離，得到純度約97 %以上之金屬產物。為了使二次之金屬銦、鎵資源得以回流至產業，運用電解精煉的方式提高金屬產物之純度達產業標準的4N5（99.995 %）以上。

As the massive usage of indium and gallium nowadays, the limited metal resources and enormous amount of related waste become problems to the environment. This study is devoted to recover indium and gallium from the spent targets by hydrometallurgy. This method can be divided into two parts, the first is separation part and the second is recovery part. The separation part, which is mainly to dissolve the targets and separate the three metals apart from each other, includes acid leaching, solvent extraction and stripping. As for the recovery part after stripping, both metal oxides and metal ingots were investigated as product. The metal oxides, In2O3, Ga2O3 and ZnO, were obtained from the solution through chemical precipitation and calcination, respectively. Meanwhile, using zinc and aluminum as reducing agent to cement and recover the indium and gallium in metal state from the solution. The electrolytic refining was applied to raise the purity of the obtained indium and gallium to fit the criteria of the manufacturing materials. In this study, both the recovery efficiency of indium and gallium are over 99%. The purities of obtained metal oxides are all over 99.5% and the metal product of indium and gallium are refined to the purity over 4N5(99.995%). A method to recover indium and gallium from the e-wastes was provided to treat the related wastes contains indium, gallium and zinc. Since that, the amount of wastes can be reduced and the metal resources can be recycled for environment protection.

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