Oxidative stripping of vanadium from mixed solvents of D2EHPA and TBP by hydrogen peroxide

摘要

The paper presented focuses on the synchronous process of oxidation and stripping of vanadium from the loaded organic phase using H_2O_2. The results indicated that about 45% of vanadium could be released after the organic phase was contacted with the aqueous phase (initial pH = 7.0) for 40 s at room temperature when O/A = 10/1 and nH_2O_2V_2O_5 = 5/1, and a 97% vanadium stripping efficiency was achieved after a three-stage counter-current stripping process. Stripping experiments were carried out repeatedly to confirm that H_2O_2 had little effects on the performance of the organic phase. Precipitation of vanadium in the stripping solution was sequentially carried out. Results of X-Ray Diffraction (XRD) for the precipitant indicated that hydrated ammonium vanadate was formed. Product V_2O_2_5 of high purity was obtained after the calcination of the precipitant.