Method of Controlling the Morphology of Cathode Deposit by Determining Electrochemical Resistance for Copper Electrodeposition Process
DOI:
https://doi.org/10.20535/1810-0546.2016.2.60951Keywords:
Cathodic polarization, Cathodic deposit morphology, Maximum current density inhibition effect, Migration mass transferAbstract
Background. The intensification of compact copper electrowinning process based on increasing of maximal permissible working current density is an actual problem.
Objective. The aim of this work is the development of method for determining maximal permissible working current density of compact copper deposits based on application of electrochemical resistance versus working current density (і) dependences.
Methods. The method of cathodic polarization curves of copper deposition process with sulfate solutions was used. The morphology of cathodic copper deposits which had obtained under conditions of varying concentrations of copper ions, sulfuric acid, current density, had been studied by metallographic microscope.
Results. It was shown that maximal working current density of compact copper deposit formation, with permissible quality for hydrometallurgy, complies with beginning of growing after minimum r i – i curve. It was found that increasing of copper concentration leads to enlargement of minimal range, but increasing of acid concentration conversely narrowed this range. The equation which allows dividing of migration and diffusion components of limiting current density for this system was analytically received.
Conclusions. The determination of maximal current density of compact deposits formation under conditions of varying sulfate solution composition in copper electrowinning process is carried out for the first time on the basis of differentiation polarization curves method.
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