电解液循环对废手机线路板碱性矿浆电解回收的影响

Influence of electrolyte circulation on recycling waste printed circuit boards of mobile phones by alkaline slurry electrolysis

针对废手机线路板碱性矿浆电解资源化过程中电解液带来的污染问题,采用氨-氯化铵碱性矿浆电解液循环回收废手机线路板中金属,以降低能耗、减少污染。研究了氨-氯化铵碱性矿浆电解体系从废手机板制备阴极铜的过程中,电解液循环对Cu的回收率、电流效率、Cu纯度以及Cu和Ni、Zn、Pb等金属迁移转化的影响。经过7次电解液循环实验,结果表明,电解液循环对Ni、Zn、Pb等金属分布及电流效率的影响十分显著,但Cu的分布、纯度及回收率基本不受影响。Cu主要分布在电解液和沉积物中,其他金属则主要在电解液与阳极渣中;8组实验获得的沉积物中Cu的纯度和回收率分别高于99.9%和90%。基于碱性矿浆电解回收废手机板中金属工艺中,完全可以实现电解液的循环利用。本研究可为碱性矿浆电解废线路板提供参考。

Aiming at the pollution problems caused by electrolyte in the process of alkaline slurry electrolysis of waste printed circuit boards of mobile phones, ammonia-ammonium chloride alkaline slurry electrolyte circulation was used to recover the metal in waste printed circuit boards of mobile phones(WPCB-MPs), so as to reduce energy consumption and pollution. The effect of electrolyte circulation on Cu recovery, current efficiency and purity, as well as the migration and transformation of Cu and other metals such as Ni, Zn and Pb in the process of preparing cathode copper from waste printed circuit boards of mobile phone by ammoniumammonium chloride slurry electrolysis system was studied. The results of seven electrolyte cycles showed that the electrolyte circulation had a significant effect on the distribution and current efficiency of Ni, Zn, Pb and other metals, while the distribution, purity and recovery rate of Cu were hardly affected. Cu was mainly distributed in electrolyte and cathodic copper, while other metals were mainly in electrolyte and anode residues;the purity and recovery of Cu in the 8 groups were higher than 99.9% and 90%, respectively. The recycling of metal from waste printed circuit boards of mobile phones by alkaline slurry electrolysis could realize the recycling of electrolyte. This study can provide a reference for the high value resource recycling of alkaline slurry electrolysis in waste circuit board.