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

• H2O2 was proposed as both the oxidant and the strippant.
• The production of toxic gases from NaClO3 was completely avoided.
• The cost of vanadium extraction was greatly decreased.
• The recovery process was greatly simplified.

The paper presented focuses on the synchronous process of oxidation and stripping of vanadium from the loaded organic phase using H2O2. 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 nH2O2/nV2O5 = 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 H2O2 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 V2O5 of high purity was obtained after the calcination of the precipitant.