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Chelating resin is broadly classified as one type of ion exchange resins. It generally consists of two parts: polymer matrix and chelating group. As chelating groups, various ligands, which have nitrogen (N), oxygen (O), and/or sulfur (S) donor atoms, are immobilized on the matrix. The chelating resins can catch a metal ion with a functional group that can form a chelate (complex) with the metal ion.
Chelation resins are found a wide range applications of metals removal and recovery, from the primary recovery of precious metals as well as the removal of impurities that may be present as mere traces. Common applications for chelating resins include:
1) Brine decalcification in the chlor-alkali industry
2) Resin-in-pulp (RIP) for base metal capture (copper, nickel, cobalt, zinc)
3) Removal of hexavalent chromium from potable water
4) Removal of boron in semiconductor process water
5) Recovery of high-value precious metal catalysts
6) Removal of mercury, regenerable and non-regenerable
The mechanism of chelating resin adsorption of metal ions is that functional atoms on the resin coordinate with metal ions to form a stable structure which is similar to small molecule chelates. All chelating resins are cation exchangers, at least with respect to their chelation properties. Chelating functionality is created by Lewis's base activity. The process of ion exchange represents a dynamic equilibrium between the liquid solution and the solid resin. Depending on the chelating product used, regeneration is possible by disrupting the complex formation or by using a competing ligand that is more favorable than the resin functional group.
Alfa Chemistry is a leading manufacturer of chelating resins. We offer chelating resins in various specifications which can be used in many types of applications. To place an order or request a quote, please don't hesitate to contact us.
