We have recently commissioned an EMEW cell for extracting Ag from silver nitrate electrolyte.It is cylindrical cell operated at 5.6V(450 A- 550 A) with cathode as stainless steel and anode as Titanium.The problem is there is a lot of impurities deposition occurring,mainly lead an copper. Electrowinning cells powder deposition is not affected by the high amount of impurities present in it, because these cells are designed to extract silver and gold of 99.99% purity from it. I have attached a data about electrolyte composition and the powder obtained from it after electrowinning.
It would be of great help if somebody knows the science behind it and how to eliminate it.
It would be of great help if somebody knows the science behind it and how to eliminate it.