Influence of concentrations of copper,levelling agents and temperature on the diffusion coefficient of cupric ions in industrial electro-refining electrolytes |
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| Authors: | O Gladysz P Los E Krzyzak |
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| Affiliation: | (1) Department of Inorganic Chemistry, Wroclaw Medical University, Szewska 38, Wroclaw, 50 139, Poland;(2) IDMoS, PBC The Technology Park, Dundee, DD2 1SW, Scotland, UK |
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| Abstract: | Few data are available for diffusion coefficients measured in industrial copper electrolytes. In the present work the influence
of copper concentration (19.9–58.1 g dm−3), temperature (20–60°C) and concentrations levelling agents i.e. animal glue (0–5 mg dm−3) and thiourea (0–5 mg dm−3) on diffusion coefficients of copper was studied in industrial copper refinery electrolytes. Chronoamperometry at ultramicroelectrodes
was used as an electrochemical technique. Apparent bulk diffusion coefficients were calculated on the basis of the theory
of electrochemical nucleation on disc-shaped ultramicroelectrodes. Increasing copper concentration decreased the apparent
bulk diffusion coefficient of copper and diffusion coefficients followed the Arrhenius temperature relationship. The experimental
activation energy was 26.8 kJ mol−1. The influence of levelling agents on diffusion coefficients was not strong in the studied concentration range of animal
glue and thiourea. |
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| Keywords: | Chronoamperometry Diffusion coefficient of cupric ions Industrial electro-refining electrolytes Ultramicroelectrodes |
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