LEWATIT® MonoPlus TP 220

Lewatit® MonoPlus TP 220 is a macroporous weakly basic resin with chelating bis-picolylamine groups for copper, nickel and cobalt processing solutions. lt has a monodisperse bead size distribution, i.e. beads of an uniform size, which results in high adsorption kinetics and a good utilization of the theoretical capacity.
Under acidic conditions (pH =2) heavy metal cations are removed from aqueous solutions consistent with the following selectivity series: Cu²⁺>>Ni²⁺>U0₂²⁺>Fe³⁺>Zn²⁺>Co²⁺>Cd²⁺>Fe²⁺.
Lewatit® MonoPlus TP 220 is especially suitable for the use in the following applications:

• Purification of cobalt electrolytes (cobalt/nickel separation)
• Separation of nickel/copper from ferric solutions
• Recovery of copper from strongly acidic solutions (pH < 2)
• Purification of chromium(III) baths (removal of heavy metals such as copper and nickel)
• Adsorption of heavy metals (e.g. copper) from solutions containing strong chelating agents like EDTA

While most metals are removed from the loaded resin with a conventional acid strip, copper can only efficiently be desorbed with ammonia solution.