Department of Civil and Environmental Engineering, Indian Institute of Technology Patna, Bihta, Bihar, India.
Department of Civil and Environmental Engineering, Indian Institute of Technology Patna, Bihta, Bihar, India.
Waste Manag. 2018 May;75:103-123. doi: 10.1016/j.wasman.2018.02.014. Epub 2018 Feb 14.
Comprehensive characterization of printed circuit board (PCB) of end-of-life electrical and electronic equipment (EEE) is obligatory for prospective profitable beneficiation. In this study, beneficiation oriented comprehensive characterization of two brands of PCBs each of 16 end-of-life EEE was conducted in terms of their physicochemical characteristics with special emphasis on the content of 16 general elements, 2 precious metals and 15 rare earth elements (REEs). General elements and their highest weight percent composition found in different PCBs of the EEEs were Cu (23% in laptop), Al (6% in computer), Pb (15% in DVD player) and Ba (7% in TV). The high abundant of precious metals such as Au (316 g/ton) and Ag (636 g/ton) in mobile phone and laptop, respectively coupled with rapid obsolescence age makes waste PCBs of information technology and telecommunication equipment the most potent resource reservoir. Additionally, most of the waste PCBs were observed to contain REEs in considerable quantity with Sc up to 31 g/ton and Ce up to 13 g/ton being the major constituents. Comprehensive characterization of waste PCBs therefore will systematically help towards better understanding of e-waste recycling processes for beneficiation purpose and sustainable resource circulation and conservation.
对报废电子电气设备（EEE）的印刷电路板（PCB）进行全面的特征描述，对于有前景的盈利回收是强制性的。在这项研究中，对两种品牌的 PCB 进行了面向回收的全面特征描述，每种 PCB 都来自 16 种报废 EEE，涉及到它们的物理化学特性，特别强调了 16 种常规元素、2 种贵金属和 15 种稀土元素（REEs）的含量。在 EEE 的不同 PCB 中发现的常规元素及其最高重量百分比组成是 Cu（笔记本电脑中为 23%）、Al（计算机中为 6%）、Pb（DVD 播放器中为 15%）和 Ba（电视中为 7%）。贵金属如 Au（316 g/吨）和 Ag（636 g/吨）在手机和笔记本电脑中的高含量，加上快速过时的年龄，使得信息技术和电信设备的废弃 PCB 成为最有潜力的资源库。此外，大多数废弃 PCB 中都含有相当数量的 REEs，其中 Sc 高达 31 g/吨，Ce 高达 13 g/吨，是主要成分。因此，对废 PCB 进行全面的特征描述将有助于更好地理解电子废物回收的过程，以实现回收利用和可持续的资源循环和保护。
