The effect of gold on anode passivation and high current density operation under simulated silver electrorefining conditions

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • Bandung Institute of Technology

Abstract

In the silver electrorefining process, the presence of gold as an impurity in anodes can affect process performance. In the present investigation, the effect of gold on anode passivation and the kinetics of dissolution at high current density were studied. Experiments were conducted using artificial silver anodes with gold contents of 2%, 5%, 10% and 20% (w/w) and acidic nitrate electrolytes containing 40 g/dm3 and 60 g/dm3 of Ag+. Results obtained from potentiodynamic measurements showed that in order to have higher current densities than 50 mA/cm2 and higher energy efficient operation, the gold content in anode should be limited to ≤10%with 60 g/dm3 of Ag+ electrolyte.
In contrast, the same current density operation for 40 g/dm3 electrolyte will be applicable for anodes with ≤3.2% gold content with high energy inefficiency.

Details

Original languageEnglish
Pages (from-to)57-61
Number of pages5
JournalHydrometallurgy
Volume166
Publication statusPublished - 12 Sep 2016
MoE publication typeA1 Journal article-refereed

    Research areas

  • Gold impurities, Current efficiency, Nitric acid electrolyte, dissolution kinetics, High current density electrorefining

ID: 7379948