Silver electro-refining is mainly used to treat Dore alloy from copper/lead anode slime and WEEE recycling,crude gold-silver alloy from cyanide gold slime smelting and other silver-bearing scrap and jewelry.

Silver ER is performed in FRPP electrolytic cells. Silver anode plate and titanium plate are used as anode and cathode respectively. The electrolyte is diluted silver nitrate made from nitric acid and silver powder. During operation, silver dissolves at the anode and deposits at the cathode. Copper content also dissolves in the solution. Lead and bismuth is hydrolyzed into oxides, and the gold, the majority of platinum, palladium are insoluble, which report to anode slime. The cathode silver is powder form in needle-shape on the titanium plate. It is shaved to the cell bottom. By setting and filtration, the electrolyte is circulated back to ER cell and the silver powder is dried, melt and cast into 15kg or 30kg ingot.