Consideration of enthalpic and entropic energy contributions to the relative rates of chalcopyrite dissolution in the presence of aqueous cationic impurities

• Leaching evolves from interface- to transport-controlled during dissolution.
• With additives (M) the rate of dissolution: K+ > Al3+ > none > Mg2+ > Na+ > Ca2+
• M–OH2 volume is inversely correlated to dissolution rate per unit ionic strength.
• The relative rates are related to the entropic effect on solute hydration.
• For Fe addition, this effect is convoluted with its role as an oxidant.