For some time now, ore bodies around the world have been declining in grade, whilst increasing in complexity. The level of impurities relative to the valuable metal is steadily increasing, posing new challenges to existing operations. Ion exchange is widely used in the hydrometallurgical industry for both primary recovery of metals and the removal of impurities. The superior selectivity of ion exchange resins makes them exceptionally suitable for the removal of target impurities to very low levels, thereby saving operating costs, increasing the value of the final product and significantly improving revenue. Examples of impurities that are successfully removed via ion exchange include iron, antimony and bismuth from copper electrolyte, copper and zinc from cobalt electrolyte, nickel from cobalt electrolyte. In the copper electrolysis process, antimony, bismuth and arsenic tend to form slimes which are dispersed in the electrolyte. These slimes contaminate the cathode and/or decrease the quality of the copper deposition. To avoid these problems, chelation resins have been used to remove the impurity metals from the copper sulphate solution. The ion exchange process in this application is very simple, using standard ion exchange equipment and acid regeneration. This paper will address a few of these examples in more detail.