LEWATIT® TP 207

Lewatit® TP 207 is a weakly acidic, macroporous cation exchange resin of standard bead size distribution with chelating iminodiaceticacid groups designed for the selective extraction of heavy metal cations from weakly acidic to weakly basic solutions. Divalent cations are removed from neutralized waters in the following order (decreasing affinity):

Copper > Vanadium (V0²') > Uranium (U0₂²1 > Lead > Nickel > Zinc > Cadmium > Cobalt > Iron (II) > Beryllium > Manganese » Calcium > Magnesium > Strontium > Barium >>> Sodium.

Its good chemical and mechanical stability makes it particular suitable for the following applications:

• the selective removal of metal contaminants from processing baths
  the concentration, extraction and recovery of heavy metals from hydrometallurgical solutions
• the recovery of useful metals from electroplating rinse waters
• the selective trace removal of heavy metals from industrial metal surface finishing effluents, even in presence of high calcium concentrations
• the selective removal of heavy metals out of contaminated ground and waste water streams for potable water production and ground water remediation

The selective extraction of heavy metal cations by Lewatit® TP 207 is also achieved in presence of complexing agents such as nitrogen compounds (e.g. ammonia, aliphatic and aromatic amines), multivalent carboxylic acids (e.g. citric, gluconic, tartraric, oxalic acid) and phosphates (e.g. sodium polyphosphate, tetrasodium diphosphate).