Abstract

Publisher Summary This chapter presents the calculations of the concentration of iron and copper ions in aqueous sulfuric acid solutions as functions of the electrode potential. When reprocessing metal containing aqueous solutions by electrolysis, it is useful to know the behavior and theoretically possible concentrations of the metal ions in the area near the electrodes as a function of the prevailing electrode potential and pH value. The chapter concerns a sulfuric acid solution with variable contents of iron and copper, and an acid concentration of 100 g of free H 2 SO 4 per liter. The system is investigated with complex equilibrium methods. The differences from the stoichiometric reaction approach are pointed out. The calculation results permit an estimation and judgment of the conditions that have to be chosen in potential aqueous metal recovery processes. However, it is evident that the application of the “classical” method, that is, the exclusive use of the Nernst equation for a preselected stoichiometric reaction, permits no comprehensive understanding of the equilibrium state of a complex multi-component system.

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