|About this Abstract
||Part C-1: Hydrometallurgy 2018
||Manganese-Chloride Interactions on Pb-Ag Anode Behavior
||Charles E. Abbey, Jin Wei, Michael Scott Moats
|On-Site Speaker (Planned)
||Charles E. Abbey
Manganese in electrolyte has both beneficial and detrimental effects in Zn electrowinning. Mn oxidizes to form MnO2 on Pb-Ag anodes, cell walls and pipes. MnO2 reduces anode corrosion but also leads to short circuiting and maintenance issues. Manganese ions and MnO2 interact with chloride ions and oxidized chlorine species. These interactions are not well understood. Therefore, two sets of 45+ day benchscale experiments were conducted to investigate the effects [Mn] to [Cl] ratio on anode corrosion rate and electrolyte chemistry using rolled Pb-Ag anodes. Daily Mn and Cl losses from the electrolyte appeared to be correlated. Increasing the average Mn/Cl ratio from ~7:1 to ~11:1 reduced the observed corrosion rates. Increasing the ratio above 11 did not reduce the corrosion rate further. Anodes scales characterized produced with Mn/Cl ratios at and above 11:1 contained some γ–MnO2 while scales formed with ratios less than 11:1 did not.
||Planned: At-meeting proceedings