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Communication Dans Un Congrès Année : 2016

Sonochemical process for copper leaching and electrochemical re-deposition in a DES solvent

Résumé

ver the last decade, the continuous growth of the electronic equipment market has led to an increasing amount of scraping. Nowadays, it is thought that one third of the copper stock is already present within this so-called “urban mine” (in-use stock), which must now absolutely be recovered for ecological and economic reasons. A hydrometallurgical method for copper and precious metal recovery from e-waste should include several steps: leaching (chemical dissolution), ion separation and subsequent electrochemical re-deposition of the target metals. While this task is achievable in aqueous solutions, it requires strong acid or cyanide solutions. The aim of the study is to develop a new environmentally-friendly process by using a form of cheap and safe ionic liquid such as Deep Eutectic Solvent (DES), for both leaching and electrodeposition. The experiments were performed in Ethaline, a mixture of Choline chloride and ethylene glycol, under 20 kHz ultrasonic stirring. Under optimized temperature and stirring conditions, the leaching rate of copper reaches 65 mg/h cm2. An interesting feature is that, in this media, copper dissolves into the form of Cu(I) complex instead of Cu(II) complex, so that the subsequent electroreduction of the copper ions is energetically more favorable. Copper deposits obtained from Cu I -DES solution present a sand-rose cluster morphology inducing a large developed surface. Application of ultrasound during electrodeposition allows grain size reduction and crystallographic modifications, compared to silent conditions.

Domaines

Chimie
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Dates et versions

hal-01719783 , version 1 (28-02-2018)

Identifiants

  • HAL Id : hal-01719783 , version 1

Citer

M.-L. Doche, A. Mandroyan, M. Mourad-Mahmoud, V. Moutarlier, J.-Y. Hihn. Sonochemical process for copper leaching and electrochemical re-deposition in a DES solvent. XXX International Conference on Surface Modification Technologies (SMT30), Jun 2016, Milan, Italy. ⟨hal-01719783⟩
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