Accurate measurement of polarization potentials during electrodeposition of nickel metal from sulphate electrolytes

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dc.contributor.author Schoeman, Liezl
dc.contributor.author Sole, Kathryn C.
dc.date.accessioned 2018-07-02T10:46:41Z
dc.date.available 2018-07-02T10:46:41Z
dc.date.issued 2017-07
dc.description This paper was first presented at the 3rd Young Professionals Conference, 9–10 March 2017, Innovation Hub, Pretoria, South Africa. en_ZA
dc.description.abstract Extraction of nickel from either laterite or sulphide ores involves various complex hydrometallurgical processes, the final step of which is often electrowinning to produce pure nickel metal. Methods to investigate, monitor, and control the electrowinning process are therefore of importance for producing nickel metal of desirable quality and purity. The significance of potential measurements during the electrowinning process is well established. Many potential measurement methods, however, are not sufficiently accurate or repeatable, and it is therefore often difficult to monitor and control the electrodeposition process accurately. The relationship between nucleation (deposition of the first nickel clusters to the cathode surface) and growth (as more and more nickel clusters deposit) during electrodeposition is paramount for controlling the formation and quality of the nickel metal electrodeposit. A need therefore still exists for accurate measurement of both nucleation and plating overpotentials during the early stages of electrodeposition. In this investigation, a polarization measurement technique was developed for nickel electrodeposition from sulphate electrolytes under typical commercial electrowinning conditions. This method is repeatable and accurate within approximately 10 mV, and enables the quick and concise monitoring of both nucleation and plating during nickel electrodeposition. en_ZA
dc.description.department Materials Science and Metallurgical Engineering en_ZA
dc.description.librarian am2018 en_ZA
dc.description.uri http://www.saimm.co.za/journal-papers en_ZA
dc.identifier.citation Schoeman, L. & Sole, K.C. 2017, 'Accurate measurement of polarization potentials during electrodeposition of nickel metal from sulphate electrolytes', Journal of the Southern African Institute of Mining and Metallurgy, vol. 117, no. 7, pp. 623-628. en_ZA
dc.identifier.issn 0038-223X (print)
dc.identifier.issn 2225-6253 (online)
dc.identifier.other 10.17159/2411-9717/2017/v117n7a3
dc.identifier.uri http://hdl.handle.net/2263/65288
dc.language.iso en en_ZA
dc.publisher Southern African Institute of Mining and Metallurgy en_ZA
dc.rights © The Southern African Institute of Mining and Metallurgy, 2017 en_ZA
dc.subject Nickel electrowinning en_ZA
dc.subject Polarization potential measurement en_ZA
dc.subject Sulphate electrolyte en_ZA
dc.subject Galvanodynamic scan en_ZA
dc.title Accurate measurement of polarization potentials during electrodeposition of nickel metal from sulphate electrolytes en_ZA
dc.type Article en_ZA


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