Lewatit® MonoPlus TP 220 is a macroporous weakly basic resin with chelating resin with bis-picolylamine groups for copper, nickel and cobalt processing solutions. It has a monodisperse bead size distribution, i.e. beads of a uniform size, which results in high adsorption kinetics and a good utilization of the theoretical capacity. The resin exhibits a very high osmotic and mechanical stability to meet the requirements of metal processing technologies. It is delivered in the protonated sulfate form and can therefore be used without pretreatment. Under acidic conditions (pH=2) heavy metal cations are removed from aqueous solutions consistent with the following selectivity series: Cu2>>Ni2>>UO2>Fe3>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.Information provided by Lanxess. |