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从热处理的PCB中可持续地回收金属的绿色深度环保溶剂 (DES):一种比传统方法更绿色的替代方案

Snigdha Mishra^1,2, T N Hunter², K K Pant^1,3

¹Green and Sustainable Engineering Lab, Department of Chemical Engineering, IIT Delhi, Hauz Khaz, Delhi, 110016, India.

|January 8, 2024

概括

这项研究引入了一种更绿色的方法,用于利用深度解剂 (DES) 从电子废物中提取金属. 这些环保溶剂提供了一个比有毒酸更安全的替代品,用于从废弃PCB中回收铜和等贵金属.

科学领域:

材料科学材料科学材料科学
环境化学环境化学
化学工程是化学工程的重要组成部分.

背景情况:

废弃的印刷电路板 (PCB) 含有宝贵的基本金属,如铜,锡,,铁和.
从PCB中炼金属的传统方法涉及有毒和腐蚀性的酸性或性溶液.
开发可持续和环保的电子废物回收方法至关重要.

研究的目的:

提出一种环保的方法,使用深度环氧溶剂 (DES) 从热处理的PCB (TPCB) 中出基金属.
选DES以获得最佳的金属可溶性和选择性.
为了研究金属提取的动力学.

主要方法:

使用基于胆化物的深度浸泡溶剂 (DES),包括FA-ChCl和尿素-ChCl,用于金属出.
基于金属氧化物可溶性和选择性选的DES.
针对特定金属的优化提取条件 (温度,时间,固体/液体比,速度).
应用了收缩核心模型来分析铜提取的动力学.

主要成果:

FA-ChCl对铜 (Cu),铁 (Fe) 和 (Ni) 具有很高的溶解性.
尿素-ChCl对 (Zn) 具有很高的选择性和可溶性,在最佳条件下达到90.4%的提取率.
酸有效地从TPCB中去除了92.3%的锡 (Sn).
动力分析表明使用FA-ChCl.Cl进行Cu提取的扩散控制过程.

结论:

基于胆化物的DES为废PCB的金属回收提供了比传统矿物酸更绿色的替代方案.
开发的基于DES的方法为电子废物回收提供了一个环保的方法.
优化条件和溶剂选择是从TPCB中有效回收金属的关键.

关键词:

DFT计算的计算方法深度阳光溶剂 (DES) 是一种深度阳光溶剂.运动学运动学金属提取金属的提取方法印刷电路板 (PCB) 的使用

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