Electrochemical studies of ionic liquid additives during the zinc electrowinning process

By N. Sorour and W. Zhang and G. Gabra and E. Ghali and G. Houlachi
Published in Hydrometallurgy NULL 2015

Abstract

1-Ethyl-3-methylimidazolium methanesulfonate ([EMIM]MSO3) and 1-butyl-3 methylimidazolium bromide ([BMIM]Br) were evaluated individually as additives compared to gelatin and a previously studied additive ([BMIM]Cl) in zinc electrowinning from a synthetic acidic sulfate electrolyte containing 8 g dm? 3 of Mn2 + ions. A metallic impurity of 0.0055 mg dm? 3 of Sb3 + ions was examined in combination with 1 and 3 mg of each additive. Galvanostatic measurements have been employed to investigate the cathodic and anodic potentials individually and also the current efficiency of the deposited zinc metal in the acidic sulfate electrolyte for 2 h at 50 mA cm? 2 and 38

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