电动力学技术回收废旧印刷线路板中的铜  

Copper recycling from waste printed circuit boards by electrokinetics

作　　者：王蓉[1] 陈梦君[2] 黄金秀[2] 陈海焱[2] 谌书[2] 王彬[2] 

机构地区：[1]西南科技大学国防科技学院,四川绵阳621010 [2]西南科技大学固体废物处理与资源化教育部重点实验室,四川绵阳621010

出　　处：《中南大学学报（自然科学版）》2016年第4期1436-1440,共5页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(21377104);国家高技术研究发展计划(863计划)项目(2013AA040207)~~

摘　　要：采用电动力学技术,研究废旧印刷线路板(WPCBs)投加量、离子液体体积分数、电流密度、电动力学时间以及H_2O_2用量等对Cu回收率的影响以及电动力学过程中铜的分布特性。研究结果表明:Cu基本集中于阴极区,并以粉末的形式回收;各因素对Cu回收率均有不同程度的影响,其中电动力学时间的影响最为显著;电流密度过高会导致电流效率的下降而降低Cu的回收率;加入2 g WPCBs,当离子液体体积分数为10%,电流密度为20 m A/cm^2,H_2O_2体积为2 m L时,处理24 h,Cu的总回收率为84.6%;所得金属粉末主要以Cu和Cu_2O的形式存在,含量为97.86%。此法可以直接在组成极其复杂的WPCBs中回收金属铜,为其资源化提供了新的途径。A new technology, called electrokinetics, was applied to recovery copper from WPCBs. Factors, such as WPCBs adding amount, ionic liquid concentration, current density, time and H2O2 amount, which affect Cu recycling rate as well as Cu distribution during the process were examined. The results show that Cu is mainly concentrated in cathode chamber and recycled as powder. All the factors can affect Cu recycling rate, especially time. A relatively higher current density will lower the current efficiency, making Cu recycling rate down. When 2 g WPCBs powders are used, the ionic liquid volume fraction is 10%, H2O2 adding amount is 2 m L, Cu recycling rate will reach 84.6% with current density of 20 m A/cm2 for 24 h. And the obtained powders are mainly Cu and Cu2O with a Cu purity of 97.86%. Electrokinetics can be successfully used for recycling Cu from such a complex system as WPCBs, which provides a novel and prospective solution for WPCBs reutilization.

关 键 词：废旧印刷线路板 电动力学 铜 离子液体 回收 

分 类 号：TF131[冶金工程—冶金物理化学] X705[环境科学与工程—环境工程]