Dismantling of Waste Printed Circuit Boards with the Simultaneous Recovery of Copper: Experimental Study and Process Modeling

Abstract

The study was carried out with the aim to demonstrate the applicability of a combined chemical–electrochemical process for the dismantling of waste printed circuit boards (WPCBs) created from different types of electronic equipment. The concept implies a simple and less polluting process that allows the chemical dismantling of WPCBs with the simultaneous recovery of copper from the leaching solution and the regeneration of the leaching agent. In order to assess the performance of the dismantling process, various tests were performed on different types of WPCBs using the 0.3 M FeCl3 in 0.5 M HCl leaching system. The experimental results show that, through the leaching process, the electronic components (EC) together with other fractions can be efficiently dismounted from the surface of WPCBs, with the parallel electrowinning of copper from the copper rich leaching solution. In addition, the process was scaled up for the dismantling of 100 kg/h WPCBs and modeled and simulated using process flow modelling software ChemCAD in order to assess the impact of all steps and equipment on the technical and environmental performance of the overall process. According to the results, the dismantling of 1 kg of WPCBs requires a total energy of 0.48 kWh, and the process can be performed with an overall low environmental impact based on the obtained general environmental indexes (GEIs) values.

Discarded e-waste/printed circuit boards: a review of their recent methods of disassembly, sorting and environmental implications

“…One compelling advancement in chemical disassembling is the integration of chemical and electrochemical processes, offering a comprehensive solution for both recovering ECs and reclaiming metals from DPCBs. Fogarasi et al successfully implemented a leaching system constituted by 0.3 mol/L FeCl 3 in 0.5 mol/L HCl that not only disassembles ECs from DPCBs but also facilitates the electrowinning of Cu from Cu-rich leaching solutions [103]. This approach yielded high-purity Cu deposits (Cu > 99.9%) with high current efficiency and low energy consumption.…”