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Abstract The kinetics of silver dissolution in silver electrorefining process was investigated using a series of synthetic electrolytes and different electrode sizes. Kinetic models at corrosion potential and industrial range… Click to show full abstract
Abstract The kinetics of silver dissolution in silver electrorefining process was investigated using a series of synthetic electrolytes and different electrode sizes. Kinetic models at corrosion potential and industrial range overpotentials were constructed as a function of electrolyte composition and temperature. The results revealed that overpotential of 150–200 mV vs. corrosion potential represented the values corresponding to the industrial silver electrolysis. In order to achieve a high current efficiency in silver electrorefining, our kinetic models suggest that concentration of HNO3 should be less than 5 g/dm3 or 3 g/dm3 for operation at 25 °C and 45 °C, respectively.
Journal Title: Corrosion Science
Year Published: 2018
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