Electrochemical extraction of tin and copper from acid leachate of printed circuit boards using copper electrodes

This paper presents new results for the recycling of electronic waste, specifically those from printed circuit boards (PCBs) of obsolete computers of the Federal University of Rio Grande do Norte. The main objective of this study is the comprehension of the extraction process of tin and cop per from...

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Bibliographic Details
Published in:Journal of environmental management 2019-09, Vol.246, p.410-417
Main Authors: Silva, Maria S. B. da, Melo, Raffael A.C. de, Lopes-Moriyama, André L., Souza, Carlson P.
Format: Article
Language:English
Subjects:
Electrodeposition
Metal removal
Printed circuit boards
Tin
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Summary:This paper presents new results for the recycling of electronic waste, specifically those from printed circuit boards (PCBs) of obsolete computers of the Federal University of Rio Grande do Norte. The main objective of this study is the comprehension of the extraction process of tin and cop per from PCBs by a hydrometallurgical route followed by electrodeposition using copper electrodes. PCBs powder were leached using 1N HNO3 and 3N HCl (aqua regia) aqueous solutions. The process permitted the extraction of all tin present on the PCBs. The electrodeposition processes were performed with currents from 0.5 to 1.5 A, at a constant time of 60 min, with and without mechanical stirring, and with different concentrations of leachate. The results showed that diluting the leachate favors the extraction of tin from the solution. At certain conditions we were able to extract approximately 100% of the tin, copper and lead present in the leachate. •A clean technology for the recovery of tin and other metals was developed.•The process is faster than found in typical methodologies.•The mechanisms which explain the selectivity of the process were detailed.•Dilution enhanced tin recovery up to 100%.
ISSN:0301-4797
1095-8630
DOI:10.1016/j.jenvman.2019.06.009