从废弃的印刷电路板中逐步回收铜和黄金的生命周期分析
Mudila Dhanunjaya Rao1, Rohit B Meshram2, Kamalesh K Singh3
1CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India; Department of Metallurgical Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, India.
Waste management (New York, N.Y.)
|October 14, 2023
概括
回收废弃印刷电路板 (WPCB) 为有害的非正式方法提供了一个环保的替代方案. 这项研究量化了回收铜和黄金对环境的影响,强调分层是关键因素.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 废弃印刷电路板 (WPCB) 通过火解或垃圾填埋的非正式回收会导致严重的环境破坏,包括有毒废水产生和地下水污染.
- 从WPCB中回收有价值元素的可持续和环保方法在经济上具有吸引力,并且在环境上是必要的.
研究的目的:
- 为了评估一个连续的铜和黄金从WPCB回收过程的摇篮到门的环境影响.
- 将这种回收方法的环境性能与非正式的处置技术进行比较.
主要方法:
- 使用GaBi软件的生命周期评估 (LCA) 用于评估环境影响.
- 进行了实验优化,从16g的WPCB中恢复4.53g的铜和2.25mg的黄金.
- 关键的工艺包括分层,浸,溶剂提取,电力提取和凝固.
主要成果:
- 化学预处理或脱层阶段对整体环境影响作出了重大贡献,主要是由于电力消耗.
- 顺序回收过程显示了减少与WPCB废物相关的环境负担的潜力.
结论:
- 建议从WPCB中回收铜和黄金的方法在工业上是可行的,并且对环境有益.
- 调查结果可以为WPCB回收设施制定环境指南.
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