A comparative evaluation of the response of platinum and mineral electrodes in sulfide mineral pulps

Control of Non-Ferrous Metal-Sulfide Minerals’ Flotation via Pulp Potential

“…We must immediately note that the indicator Eh hides two conventions: (a) it is defined by p e (p ε )-that is, introduced similarly to pH, it reflects an equilibrium (or quasiequilibrium) state; (b) the size of the parameter Eh, expressed in volts, depends on the choice of indicator electrode (if an electrode other than platinum is used) [15,[24][25][26][27][28] as well as on the temperature. Some authors have used electrodes prepared by different minerals as indicator electrodes and also refer to the measured potential difference between those electrodes and a standard reference electrode (recalculated with respect to SHE) as Eh [29][30][31].…”

“…Changing Eh and pH, similarly to the reagents' addition, achieved by using an external voltage source with electrodes inserted in the pulp [4,99,119,169,170] with the anticipation that mineral particles in the pulp will attain the potential of the control electrode and the measuring electrodes will receive the potential of the particles [28], or by using water that was previously subjected to electrolysis as the pulp preparation water [171].…”