|About this Abstract
||Part C-1: Hydrometallurgy 2018
||Characterizing the Role of Polyacrylamide Additives in Copper Electrowinning
||Christiaan Coetzee, Margreth Tadie, Christie Dorfling
|On-Site Speaker (Planned)
Additives are commonly used in copper electrowinning to improve cathode morphology. Polysaccharides such as guar are generally favoured as additives due to its compatibility with solvent extraction. Polyacrylamides are, however, being considered as possible alternatives. Understanding the influence of the structural chemistry of additives on electrowinning performance is critical to utilise them efficiently. This project investigated polyacrylamides which are structurally different as electrowinning additives; their effects on copper electrodeposition were characterized and compared to that of guar. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques were used to characterize the effects of molecular weight and ionic charge of the polyacrylamides on electrodeposition. The findings were compared against results obtained with an industrially used guar and polyacrylamide product. Equivalent circuit modelling of EIS data indicated that an increase in polyacrylamide concentration and a decrease in additive molecular weight increased the overall system resistance, supporting the findings from CV.
||Planned: At-meeting proceedings