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LEWATIT® M+ TP 207

Lewatit®MonoPlus 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. Lewatit®MonoPlus TP 207 is of monodispersed bead size distribution, means beads of uniform size. Its superior kinetic behavior leads to a faster uptake of ions and a better utilization of capacity compared to ion exchange resins with heterodispersed bead size distribution.

Business Unit
Ion Exchange Resins

Properties and benefits
Therefore it is especially suitable for use in the following applications:

  • concentration, extraction and recovery of heavy metals from hydrometallurgical solutions, e.g. by Resin-in-Pulp processes
  • removal of metal contaminants from processing baths
  • recovery of industrial useful metals from electroplating rinse waters
  • selective removal of trace heavy metals from effluents of the metal surface finishing industry, even in the presence of high calcium concentrations
  • 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®MonoPlus 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® MonoPlusTP 207 has to be conditioned with caustic soda solution after every regeneration cycle before every exhaustion cycle. After the conditioning it is partially in a salt-form, e.g. mono-sodium-form. Before commissioning a    Lewatit®MonoPlus TP 207 aboratory tests. unit, see our Technical Information OC/I 20 343e for

Synonyms
Ion Exchange Resin