Separation and recovery of chromium and vanadium from vanadium-containing chromate solution by ion exchange

摘要

To recover vanadium from vanadium-containing chromate solution, the separation of vanadium from chromium using the weak base resin D314 both in batch and column test was studied. Experimental results showed that in the pH range of 2.5-6.5, by double-adsorption with the resin, vanadium and chromium can be completely separated and recovered from vanadium-containing chromate solution. In the adsorption of vanadium, the bed volume reached 20 using the vanadium-containing chromate solution containing 2.21 g/L V_2O_5 and 3.89 g/L Cr_2O_3 under pH 6.45 at 25 °C for contact time of 60 min. The loaded resin was easily stripped using 2 mol/L NaOH solution, resulting in 106.83 g/L V_2O_5 and only 0.11 g/L Cr_2O_3 in strip liquor. The chromium in the effluent was then recovered using the same resin, and the final product of Cr_2O_3 with purity of 99.2% was obtained from the chromium strip liquor by reduction and precipitation.