2019-06-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/700356摘要：現代對於電子產品需求量大，且商品不斷研發創新，產品汰換率隨之提高，產生龐 大的電子廢棄物。電子廢棄物中，印刷電路板含多種貴金屬，包括金、銀、鉑、鈀 與錫等，印刷電路板因此被視為重要的二次材料。為回收印刷電路板中貴金屬，會 透過金屬剝除劑及硝酸將電路板上金屬浸出，再由其他化學方法將目標金屬還原沉 澱後取出；而回收後產生酸性溶液尚未有適當再利用方法，通常被視為廢水以酸鹼 中和法處置；此廢水成分除了硝酸濃度高外，也包含大量的銅，因此極具回收之潛 力。本研究計畫目的在於處理與再利用回收印刷電路板貴金屬後剩餘之酸性廢水 ，使用減壓真空蒸餾技術淨化廢水水質，並透過此有效固液分離方式回收廢水中有 價金屬。本研究計畫分為三個部分：第一部分工作項目為測試真空蒸餾各項操作參 數影響程度(溫度、壓力與時間)，並且探討蒸餾出廢水汙染物濃度與回收蒸餾出金 屬鹽類結晶之再利用可能性；第二部份工作項目為再利用廢水合成硫化銅作為吸附 材料，並且改質一般商用活性碳，藉由真空蒸餾技術固液分離；最後一部分為測試 改質後活性碳在模擬煙道氣系統中對汞之吸附能力，以充分實踐廢棄物資源再利用 與污染防制之雙重效益。<br> Abstract: Electronic equipment has been developed and used for years, and its demand has been increasing rapidly. Moreover, the advance in science and technology leads to a marked increase in the replacement rate of electronic equipment. The rapid growth in needs causes the critical problem of electronic waste (E-waste). Printed circuit boards (PCBs) contain a wide variety of precious metals, such as Au, Ag, Pt, Pd, and Sn. Waste PCBs are thus important recycling materials because of its potential high value. In order to recycle precious metals from PCBs, the mixtures of metal stripping agents and nitric acid are used to extract metals from PCBs by leaching processes. Then, the target metal is precipitated by chemical method. Notably, after recovering the precious metals, these processes produce a great amount of acidic wastewater, which is typically not able to be recycled. The wastewater contains nitric acid in a very high concentration and typically a large amount of Cu, both of the acid and Cu are valuable to be recovered. The proposed project aims to provide a recovery and reuse method for the acidic wastewater for PCBs recycling processes. The project is mainly divided into three parts. Firstly, direct treatment of the PCB treated wastewater is conducted by vacuum distillation; the Cu salts could be recovered by precipitation. The test parameters include temperature, pressure, and duration. Secondly, the PCB treated wastewater is used to surface-modify activated carbon; simultaneously, treatment of the PCB treated wastewater is also conducted by vacuum distillation. Finally, we test the Hg0 adsorption capacity of modified activated carbon in simulated coal-combustion flue gases. An attempt in both resource recovery and pollution control is thus simultaneously achieved.印刷電路板真空蒸餾廢水處理活性碳改質汞PCBsvacuum distillationcopperactivated carbonmercuryresource recovery