ANA MARIA POPESCU, CRISTINA DONATH, ELENA IONELA NEACSU, VASILE SOARE, VIRGIL CONSTANTIN<br>Preliminary Study for Copper Recovery in WEEE Leachate <br>by Using Ionic Liquids Based on Choline Chloride

ANA MARIA POPESCU, CRISTINA DONATH, ELENA IONELA NEACSU, VASILE SOARE, VIRGIL CONSTANTIN
Preliminary Study for Copper Recovery in WEEE Leachate
by Using Ionic Liquids Based on Choline Chloride

Abstract:

The rapid development of the global economy and intense use of electric and electronic equipments lead to the increase of the waste quantity (electrical and electronic wastes, WEEE). Due to their high toxicity, these materials have become one of the major environmental risks. The necessity for the treatment of WEEE results from the large quantities generated and the content of valuable metals (as Cu, Sn, Zn, Pb etc.). Globally, the recovery of WEEE contained metals is a subject which has generated numerous studies, leading to the development of some technologies based on combining the classical pyro- and hydrometallurgical methods, specific for obtaining metals. Since copper is an important metal for industries, development of Cu recycling processes is an important issue. The aim of this paper is to recover Cu by using from the multicomponent alloy obtained by pyro-metalurgic technology from WEEE. We aim to develop a novel ecological technology for the recovery of metals from WEEE by leaching and electrodeposition using ionic liquids based on choline chloride (ChCl). For obtaining the leaching state we used mixtures of ChCl-X (X=Urea, Malonic acid and CuCl2×2H2O). Metallic copper and tin were then electrochemically recovered from the ionic liquids in the electrowinning stage. It was found that the peak potentials for Cu ions reduction are very similar using either Pt or glassy carbon as counter electrode. The electrochemical study allowed determining the mechanism for Cu2+ reduction in ChCl-X (X=Urea, Malonic acid and CuCl2×2H2O) ionic liquids, which appears to be a two steps mechanism for copper probably involving copper chloride complex. Finally the obtained metallic deposits on the copper/steel cathode (were subject of determination of XRD and microscopy in order to evidence the deposits structure and morphology). Keywords: metals recovery, ionic liquids, electrodeposition, waste recovery

Issue: 2016, Volume 67, Issue 6

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