In the context of commercial mining, the use of ion exchange resins for primary manganese collection is not currently practiced; however, several pilot operations have been evaluated. Heavy metals can be selectively removed from acid leach solutions using DOWEX™ M4195 Chelating Resin.
In very strong acids, manganese forms anionic complexes (42KB PDF) that can be effectively removed from the acid using a strong base anion exchange resin such as DOWEX 21K XLT Resin.
Manganese removal from water via ion exchange is common in chemical and petrochemical processing, oil refining, semiconductor manufacturing and power utility plants.
In waters with low levels of dissolved salts, a strongly acidic cation exchanger such as DOWEX™ G 26 (H) Resin is employed.
Weak acid cation exchange resins such as DOWEX MAC 3 Resin often provide high capacity and good multivalent ion selectivity.
In more brackish waters, however, chelating/selective resins may be required. Chelating resins have reactive units dispersed along their polymer matrix, each of which has multiple metal binding sites. Hence, chelating resins, such as AMBERLITE™ IRC748i Resin, are selective for multivalent cations over monovalent cations like sodium and potassium.