Aluminum can be successfully removed from slightly acidic water-based streams with a strong acid cation exchanger like DOWEX™ G 26 (H) Resin.
If the aqueous stream has a pH from 3 to 6, a weak acid cation resin such as DOWEX MAC 3 Resin should be considered due to the higher ion exchange capacity and economical regeneration.
Aluminum can be selectively removed from brine streams with a selective resin like the iminodiacetic-functionalized AMBERLITE™ IRC748i Chelating Resin or the aminophosphonic-functionalized AMBERLITE IRC747 UPS Chelating Resin.
Anodizing Baths and Rinse Water
Processing of aluminum by bright dipping with phosphoric acid or by anodizing with sulfuric acid and other acid solutions results in the accumulation of unwanted aluminum in these streams. A strong acid cation exchange resin like DOWEX™ G 26 (H) Resin can be used for continuous removal of the aluminum. Capacities of 1 to 3 lb of aluminum per cubic foot of resin are common.
Aluminum Lewis Acids (i.e., aluminum halides) can be removed from organic solutions using weakly basic anion exchange resins such as AMBERLYST™ A21 Resin.