The development of pressure and bioleaching processes for high grade copper ores and concen-trates will result in copper
solvent extraction plants treating solutions with high copper and acid concentra-tions at temperatures up to 45℃ and these copper solvent extraction plants will run with reagent concentra-tions up to 40 vol.%. There is also a trend to use copper stripping solutions with less acid than typically used in recent years. Cognis has developed a model that accurately predicts the copper strip point for virtually any copper solvent extraction reagent or combination of reagents under a wide variety of conditions. The equilibrium strip points for several well known commercial copper solvent extraction reagents are given as a function of reagent concentration, the copper and acid concentration of the strip aqueous, and the tempera-ture. It is shown that the equilibrium strip point is not a straight line function of reagent concentration and that the equilibrium strip point increases with an increase in temperature. Copper extraction also increases as the temperature increases.