Recovery of pure silver from spent silver electroplating solutions via electrochemical process and zinc cementation

Recycling of spent silver electroplating solutions has been investigated via electrowinning and electrorefining in comparison to zinc cementation technique this research. Two different compositions transparent dark waste were used having the remaining contents 17.71 g⸳L-1 33.36 respectively. The as an electrolyte first step at low current density 0.015 A⸳cm-2. It was found that increasing time from 4 h 24 increased recovery cathode for both types solutions. optimum higher than 8 h, giving 97.5% 98.5% purity electrowinning. Through subsequent electrorefining, electrowon set anode, while HNO3 + AgNO3 containing high content 120 g Ag/L used. By controlling potential 0.8 V, crystal > 99.9% obtained. highest 99.11% when using obtained solution. Zinc however led loss precipitate form on metal surface, only 86.16% recovery.