Recovery of vanadium from the precipitate obtained by purifying the wash water formed in refining crude TiCl4

The recovery of vanadium from the precipitate formed from the wash water in the removing vanadium process from crude TiCl4 with copper wire was investigated by NaOH leaching, followed by ion exchange and precipitation of V2O5. The results indicated that this technology was an effective method for the recovery of vanadium from the precipitate. Under the optimum leaching conditions (10% NaOH leaching for 3 h at 98 °C with a pulp density of 29%), the vanadium leaching could reach 81.5%. The vanadium in the leach liquor was adsorbed by weak base resin D314, and the loaded resin was eluted by 2 mol/L NaOH. The adsorption and desorption of vanadium was 98.3% and 99.2%, respectively. NH4Cl was used to precipitate vanadium from the desorption liquor, then the ammonium metavanadate was calcined at 550 °C for 1 h to produce the high purity V2O5 powder. The overall vanadium recovery was 79.5%.

► Under the optimum leaching conditions, the vanadium leaching reached 81.5%.
► The vanadium in leach liquor can be separated and extracted by weak base resin D314.
► The overall vanadium recovery in the process was 79.5%.