Post-passivation reactions occurring at the anode during copper electrorefining

M. S. Moats, J. B. Hiskey

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A considerable amount of research has been conducted to determine the causes of anode passivation. Chemical and electrochemical reactions that occur after passivation have received little attention. Chronopotentiometry, linear sweep voltammetry, cyclic voltammetry, and impedance spectroscopy have been used to elucidate three reactions that occur after passivation of commercial copper anodes. These involve the dissolution of silver and subsequent cementation and transformation of selenides, the oxidation of lead sulfate to lead oxide, and oxygen evolution. The amount of silver dissolution depends on the silver content of the anode, the time to passivation, and the molar ratio of Ag/(Se+Te). The oxidation of lead from PbSO4 to PbOx explains a potential plateau of oxygen evolution. Silver affects the duration of oxygen evolution on the PbOx. Anodes containing kupferglimmer display a characteristic oxygen evolution potential. It is believed that kupferglimmer provides a lower overpotential for oxygen evolution than the other slime phases or passivated surface.

Original languageEnglish (US)
Title of host publication4th International Conference COPPER 99-COBRE 99
EditorsJ.E. Dutrizac, J. Ji, V. Ramachandran, J.E. Dutrizac, J. Ji, V. Ramachandran
Pages405-424
Number of pages20
StatePublished - Dec 1 1999
EventFourth International Conference COPPER 99 - COBRE 99 - Phoenix, AZ, United States
Duration: Oct 10 1999Oct 13 1999

Publication series

Name4th International Conference COPPER 99-COBRE 99

Other

OtherFourth International Conference COPPER 99 - COBRE 99
CountryUnited States
CityPhoenix, AZ
Period10/10/9910/13/99

ASJC Scopus subject areas

  • Engineering(all)

Fingerprint Dive into the research topics of 'Post-passivation reactions occurring at the anode during copper electrorefining'. Together they form a unique fingerprint.

  • Cite this

    Moats, M. S., & Hiskey, J. B. (1999). Post-passivation reactions occurring at the anode during copper electrorefining. In J. E. Dutrizac, J. Ji, V. Ramachandran, J. E. Dutrizac, J. Ji, & V. Ramachandran (Eds.), 4th International Conference COPPER 99-COBRE 99 (pp. 405-424). (4th International Conference COPPER 99-COBRE 99).