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Meeting Extraction 2018
Symposium Part C-1: Hydrometallurgy 2018
Presentation Title An Approach to Evaluate the Effect of Organic Compounds (Impurities and Additives) on Metal Electrowinning
Author(s) Daniel Majuste, Virginia S.T. Ciminelli, Paulo R. Cetlin, Eder L.C. Martins, Adelson D. Souza
On-Site Speaker (Planned) Daniel Majuste
Abstract Scope This paper describes an approach to assess the effect of organic impurities or additives on metal electrowinning and product quality. In addition to electrowinning tests and electrochemical measurements, the approach includes organic analysis by Fourier Transform Infrared spectroscopy and gas chromatography; video monitoring of reaction interface; and product characterization by microscopy, crystallographic texture and bending tests. The mechanical behavior of metal cathodes was assessed with customized bending device that is able to bend the cathodes up to angles similar to that of stripping machines. The effect of potential organic impurities, as flotation collectors, flocculants, anti-foaming agents and lubricating oils, on production of electrolytic zinc is taken as a case study. The findings allowed a better understanding on the role of different organics on energy consumption and product quality and a semi-quantitative prediction for the behavior of Zn cathodes during stripping. Simple control and optimization procedures resulted in significant savings.
Proceedings Inclusion? Planned: At-meeting proceedings

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