Perspective Method for Regeneration of Spent Solutions from Printed Circuit Boards Etching

摘要

The process of copper regeneration from spent hydrochloric acid etching solution of printed circuit boards is considered. A combined scheme is proposed, which includes the preliminary removal of excess chlorine ions from the solution, using a highly basic anion exchange resin and the subsequent electrochemical precipitation of copper. A solution contents, g/dm~3: 237 Cu, 27 NH4CI, 11.6 HC1 was used. Electrical extraction was performed at a current density of 650 A/m~2. The method makes it possible to prevent the emission of chlorine at the anode and ensures the obtaining copper as metal.