Application of Cementation Technology in a Chemical Recycle Plant Treating Waste Copper-Bearing Solution from Micro-Etching Processes
Publish Year: 1398
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JETT-7-3_004
تاریخ نمایه سازی: 6 اسفند 1398
Abstract:
Waste copper-bearing solution generated from the micro-etching process of printed circuit boards (PCBs) was studied using cementation technology in a chemical recycle plant. Operation parameters include initial copper ion concentrations (15, 23, 30 g/L) and pH values (pH = 1, 2, 3, 4) were assessed. Results showed that, within the range from 15 to 30 g/L of copper ion concentration, the reaction rate decreased with increasing the initial concentration. In addition, the higher the pH value the slower the copper cementation rate. And at pH = 4, the rate is as low as about 40 %, compared to the other pH values. It is attributed that, presumably as the pH of the solution increases, the copper hydroxide may be deposited onto the iron sheet surface to form a passivation layer, resulting in the blocking of solid-liquid interface mass transfer. Results from mass balance calculations indicated that the unit operation of the plant was quite in agreement with expectations. However, the average resource conversion rate (RCR) was at 58.7%. In order to increase the resource conversion rate, it is suggested that either a reduction of water consumption or a water recycling program to the process should be taken into consideration to increase the RCR. The result of this study is beneficial to shorten the gap between theoretical research and practical operations for chemical recycle plant that is positive to industrial waste reduction and resource sustainability.
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Authors
Nan Min Wu
Department of Environmental Engineering and Health, Yuanpei University of Medical Technology, Hsin Chu City, Taiwan
Wen Chin Chen
Department of Environmental Engineering and Health, Yuanpei University of Medical Technology, Hsin Chu City, Taiwan