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Copper Extraction from the Discarded Printed Circuit Board by Leaching

Author Affiliations

  • 1 Department of Chemical Engineering, Kongu Engineering College, Perundurai, 638052, INDIA

Res. J. Engineering Sci., Volume 2, Issue (1), Pages 11-14, January,26 (2013)

Abstract

This project deals with the experimental results of the leaching of Cu from Printed Circuit Boards (PCB) from obsolete electronic devices by means of leaching using different combinations of acidic mixtures followed by precipitation. Printed circuit boards were dismantled, cut into small pieces, and fed into a Ball mill. The powder obtained was leached by using the aqueous solutions H2SO4, H2SO4+HCl, HCl, and HCl+HNO3. The lowest values for the percentage of metal extraction were obtained with HSO4 while the HCl+HNO mixture exhibited an extraction of Cu in a maximum percentage. Precipitates were obtained at different pH values by neutralizing the leach liquors using NaOH. The HCl+HNO3 leach system presented the highest recovery values from the powder feed as well as from the leach liquor. Cu extraction after 120 minutes obtained with the various leach systems, 3.0N HCl+1.0N HNO3 exhibited the highest percentage Cu extraction (92.7% Cu).

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