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

Abstract:

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/dm³: 237 Cu, 27 NH₄Cl, 11.6 HCl was used. Electrical extraction was performed at a current density of 650 A/m². The method makes it possible to prevent the emission of chlorine at the anode and ensures the obtaining copper as metal.

• Periodical: Materials Science Forum (Volume 989)
• Pages: 548-553
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.989.548
• Online since: May 2020
• Authors: Olga Yu. Makovskaya*, A.P. Shevchuk, Y.V. Anikin
• Keywords: Cupric Chloride Solution, Effluents, Ion Exchange, Metal Recovery, Printed Circuit Boards, Recycling, Wastewater

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