- 學位論文
印刷電路板業含銅廢液銅化合物之回收與轉化
Recovery and transformation of the cupric compounds from copper containing wastewater in the PCB industry
摘要
國內印刷電路板業(Printed Circuit Board，簡稱PCB)產生多種含銅廢液，有些予以回收，其餘大都經化學沉澱處理製成銅污泥，再加以固化處理或是轉化回收成金屬銅成品。本研究將其轉化回收得硫化銅、氫氧化銅、氧化銅、氧化亞銅成品，並建立回收參數及轉化操作之技術，在實驗室進行廢液水質分析及瓶杯試驗，以得重要轉化參數及成品分析方法，將所得之操作條件及轉化參數再應用至大規模實廠操作，以增加現場試驗之成必v。 研究先探討化學銅廢液分析方法，結果證實以加酸加熱消化，可破壞實廠化學銅廢液中螯合劑-銅如:EDTA-Cu之螯合鍵結，成為自由銅離子助於AA分析出銅含量。經由水質分析後確認化學銅及硝酸銅廢液含有高濃度銅含量，值得回收再利用。使用化學銅廢液，藉由添加硫化鈉溶液產生置換轉化得硫化銅成品，並控制操作參數及範圍。分析硫化銅標準品及實廠或實驗室成品，消化分析得平均銅回收率達99.7、99.8與83.7 %。 使用硝酸銅廢液添加鹼液調整pH值為鹼性，以產生藍色氫氧化銅沉澱物，經水洗分離程序後，去除水份得氫氧化銅成品，分析氫氧化銅標準品及實驗室成品，經轉化、加酸消化分析得平均銅回收率分別為83.31及81.3 %。氫氧化銅再經加熱可轉變回收黑色氧化銅成品，分析人工硝酸銅廢水及實廠廢液在實廠及實驗室轉化回收之氧化銅成品，及氧化銅標準品經由加酸加熱消化分析平均銅回收率分別為90.7、94.7、79.8 及102.6 %。 使用還原劑A並控制反應程序及操作條件，得二價銅離子還原為一價銅轉化率為92至100 %，目前由硝酸銅廢液回收轉化之氧化亞銅成品(實際廢液銅含量為80,000與50,000 mg/L) 經由加酸加熱消化分析後，計算平均銅回收率分別為59.42及 57.15 %。
並列摘要
Printed circuit board (PCB) manufacture produces many kinds of copper containing waste liquids in Taiwan. Some of these waste liquids are recycled and others are treated by chemical sedimentation to generate copper sludge. Copper sludge is then treated by solidification or recycled to produce copper product. The goal of this study tries to reclamation copper waste liquids to produce CuS, Cu(OH)2, CuO and Cu2O productions. Reclamation parameters and transferred operation technology were also established. Characteristics of the waste liquid were analyzed in lab by jar test to obtain the transferred parameter and product analysis method. The obtained operation condition and transferred parameter were then applied to full-scale factory for increasing successful rate. The analytical method of chemical copper waste liquid was first investigated in this study. The results indicated that the chemical copper waste liquid from full-scale factory can be destroyed by digestion method. The digested solution contained copper ions were helpful for analyzing by atomic adsorption (AA) method. After characteristic analysis, chemical copper waste liquid and nitrate copper waste liquid were confirmed that they were containing high concentrated copper and deserved to reclamation. Adding Na2S solution to chemical copper waste liquid can transfer to obtain the CuS product. Meanwhile, the operation parameter and range were also controlled. The recovery of CuS standard, full-scale product and lab product were 99.7, 99.8 and 83.7 %, respectively. Nitrate copper waste liquid was adjusted to be basic to produce blue sedimentation – Cu(OH)2. The sedimentation was then washed by water, separated and dewatered to get Cu(OH)2 product. The recovery of Cu(OH)2 standard and lab product were 83.3 and 81.3 %, respectively. Cu(OH)2 can be heated to generate black CuO. The recovery of simulated nitrate copper wastewater, full-scale waste liquid transferred in site, full-scale waste liquid transferred in lab and CuO standard was 90.7, 94.7, 79.8 and 102.6 %, respectively. Using reduction agent A to control reaction procedure and operation condition, the transfer rate of Cu2+ to Cu+ was 92 to 100 %. The recovery of nitrate copper waste liquid with copper concentration which was 80,000 and 50,000 mg/L transferred to Cu2O product was 59.4 and 57.2 %, respectively.
參考文獻
延伸閱讀
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