Nov 09, 2018 · Copper and cobalt can be found on nickel laterite ores, and cobalt can be found also on copper ores, and many contaminants such as iron, aluminum, and magnesium are associated with these ores. In hydrometallurgical process, a purifiion step is necessary after leaching due to the presence of these impurities. Chelating resins are more selective for some metals than others, making them more ...