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Lewatit®TP 207 is a weakly acidic, macroporous cation exchange resin with chelating iminodiacetate groups 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:Copper > Vanadium (VO) > Uranium (UO2++) > Lead > Nickel > Zinc > Cadmium > Iron(II) > Beryllium > Manganese > Calcium > Magnesium > Strontium > Barium > Sodium.

Business Unit
Ion Exchange Resins

Properties and benefits
Lewatit®TP 207 is of standard bead size distribution. Its good chemical and mechanical stability make it specially suitable for use in the following applications:

  • selective removal of trace heavy metals from effluents of the metal surface finishing industry, even inthe presence of high calcium concentrations,
  • recovery of industrial useful metals from electroplating rinse waters,
  • removal of metal contaminants from pickling and processing baths,
  • concentration and extraction of heavy metals from hydrometallurgical solutions,
  • removal of heavy metals from contaminated ground water.

The selective extraction is achieved even in the presence of the following complexing agents:

  • nitrogen compounds, e.g. ammonia, aliphatic and aromatic amines,
  • multivalent carboxylic acids, e.g. citric acid, gluconic acid, glucuronic acid, oxalic acid, tartaric acid,
  • phosphates, e.g. tetrasodium diphosphate, sodium polyphosphate.

Lewatit® TP 207 does not remove heavy metals from solutions containing EDTA or NTA respectively. Only cadmium is removed from solutions containing cyanides.

For the extraction of those heavy metals which follow the uranyl oxide ion in the selectivity sequence as shown above,  Lewatit® TP 207 has to be conditioned with caustic soda solution after every regeneration cycle / beforen every exhaustion cycle. After the conditioning it is partially in a salt-form, e.g. mono-sodium-form. Before commissioning a Lewatit®TP 207 unit, see our Technical Information OC/I 20 343e for laboratory tests.

Ion Exchange Resin