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Authors: MARIAN-IOSIF FRÎNCU, ENIKO COVACI, SORIN-AUREL DORNEANU, PETRU ILEA.
DOI: 10.24193/subbchem.2020.3.03
Published Online: 2020-09-30
Published Print: 2020-09-30
pp.33-44
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ABSTRACT: This article presents our results concerning the feasibility of selective electroextraction of copper from leaching solutions obtained during base metals recycling from waste printed circuit boards. The researches were focused on the intensive copper electrodeposition as a potential parallel paired process for the electrochemical regeneration of the leaching solutions. Preliminary tests, performed by cyclic voltammetry on 316 stainless steel disc electrode in synthetic solutions of CuBr2, SnBr2 and PbBr2, indicate the possibility of selective electroextraction of Cu if the electrodeposition potentials of Sn and Pb are not exceeded. Therefore, selective and intensive Cu electrodeposition tests were accomplished in galvanostatic mode, in a real sample of leaching solution, using also 316 stainless steel sheets cathodes. The experimental results demonstrate that the selective electrodeposition of Cu is possible in a wide range of current densities, between 200 and 600 A/m2, if the concentration of Cu in solution of at least 12 g/L is maintained. Under these conditions, the purity of the obtained Cu deposits can attain 99.6%.
Key words: waste printed circuit boards, selective electroextraction, copper recovery, electrochemical parallel paired processes
