Completely removing vanadium from ammonium molybdate solution using chelating ion exchange resins

Some chelating resins were used to remove a small amount of V (0.35 g/L V2O5) from ammonium molybdate solution with Mo concentration around 90 g/L. The results showed that vanadium can be easily extracted over molybdenum from ammonium molybdate solution by DDAS, CUW or CW-2 resins. More than 99.5% V and less than 0.27% Mo was extracted with a contact time of 60 min at pH = 7.4 and ambient temperature. The effluent was pure ammonium molybdate solution with a Mo/V gram ratio of more than 50,000 from an initial 255. Stripping of loaded resin was excellent using 5% ammonia solution, with a maximum V concentration of 20 g/L in comparison to 0.8 g/L Mo in the eluate. The mechanism for adsorption of V from ammonium molybdate solution by chelating resins was also proposed.