Effects of Process Variables on The Electrochemical Recovery of Palladium in a HCl Solution
Effects of Process Variables on the Electrochemical Recovery of Palladium in A HCl Solution
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Abstract
This study investigated the electrochemical recovery of palladi ed for palladium leaching. Thehigh acidity of HCl solution and the low concentration of Pd ions increased the cathodic overpotential and reduced the limitingcurrent density. Lowering the current density produced dense deposits; however, they were under high tensile stress. Raising thetemperature affected both the densification and the stress, which enabled the attainment of dense Pd deposits under low stress.Lowering the current density and raising the temperature up to 70oC was recommended for the recovery of palladium as soundbulk Pd deposits. Current efficiency was over 85% at the initial stage of recovery and gradually decreased with the passage oftime. The reduction of the Pd ion concentration during the batch-type recovery may decrease the current efficiency, since a lowPd ion concentration results in a low limiting current density.
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