Multicircuit approach for electrolytic cells, a novel method to force current balance in electrowinning plants

Abstract

The most used technology for obtaining pure copper in oxide ore copper mining is LIX-SX-EW (leaching-solvent extraction-electrowinning). In this process, the maximum allowable current which does not lead to electrode short-circuit sets the production limit. This is a major drawback if equipotential bars to connect the electrodes are used. This common practice exhibits a high dispersion value for the current distribution. This paper presents a connection arrangement of the electrowinning cells to balance cathode currents. The new connection drives the current through more balanced resistivity channels. Moreover, the uniform level of current achieved produces a more standardized product. Both, chemical and physical quality of cathodes is improved. Finally, the approach limits anode-cathode overcurrent preventing short circuit formation. Thus, current efficiency and plant operation are also improved.