| The process of extracting silver from spent silver electrolyte by electrodeposition has been proposed. The influencing parameters, such as the electrolytic cell voltage and the pH of spent sliver electrolyte and the reagent for adjusting pH, were investigated in order to obtain the optimum process conditions. Silver produced from the process could conform to the state quality standard (GB/T 4135-2002) for 99.99% silver, when pH value of the electrolyte was adjusted to 3 with 20% ammonia and the electrodeposition was carried out at 35℃ for 25 h under 1.8 V electrolytic cell voltage and 60 A/m2 electric current density. The recovery rate of silver reached 99%. |
