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Removal of copper in leachate from mining residues using electrochemical technology.

Lambert, Andréa; Drogui, Patrick; Daghrir, Rimeh; Zaviska, François; Benzaazoua, Mostafa (2014). Removal of copper in leachate from mining residues using electrochemical technology. Journal of Environmental Management , vol. 133 . p. 78-85. DOI: 10.1016/j.jenvman.2013.11.036.

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Résumé

This research is related to a laboratory study on the performance of a successive mining residues leaching and electrochemical copper recovery process. To clearly define the experimental region for response surface methodology (RSM), a preliminary study was performed by applying a current intensity varying from 0.5A to 4.0A for 60min. By decreasing the current intensity from 4.0A to 0.5A, a good adhesion and a very smooth and continuous interface of copper was formed and deposited on the cathode electrode. However, the removal rate of Cu decreased from 83.7% to 37.9% when the current intensity passed from 4.0A to 0.5A, respectively. Subsequently, the factorial design and central composite design methodologies were successively employed to define the optimal operating conditions for copper removal in the mining residues leachate. Using a 2³ factorial matrix, the best performance for copper removal (97.7%) was obtained at a current intensity of 2.0A during 100min. The current intensity and electrolysis time were found to be the most influent parameters. The contribution of current intensity and electrolysis time was around 65.8% and 33.9%, respectively. The treatment using copper electrode and current intensity of 1.3A during 80min was found to be the optimal conditions in terms of cost/effectiveness. Under these conditions, 86% of copper can be recovered for a total cost of 0.56 $ per cubic meter of treated mining residues leachate.

Type de document: Article
Mots-clés libres: copper; electrochemical deposition process; mining residues leachate; response surface methodology
Centre: Centre Eau Terre Environnement
Date de dépôt: 10 avr. 2018 19:46
Dernière modification: 11 avr. 2018 18:38
URI: http://espace.inrs.ca/id/eprint/3615

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