Research on Vanadium Extraction from Vanadium-chromium Solution by Ion-exchange

According to the characteristics of vanadium extraction from vanadium slag,selective extraction of vanadium from vanadium-chromium (V-Cr) containing solution by ion exchange was put forward to evade V-Cr separation problem. Partial vanadium was selectively adsorbed from high concentration of vanadium solution containing chromium by anion resin,and the raffinate was returned to produce vanadium oxide (metallurgical grade) by the main process of vanadium extraction. The effects of resin type,p H and reaction time on the adsorption of vanadium and chromium were studied. The results show that with D201 resin modified by sodium sulphate,vanadium can be selectively adsorbed under 8.5 < pH < 10 and 30~60 min of reaction time. Vanadium pentoxide with purity of 99.83% can be obtained through desorption of the vanadium-containing resin by sodium hydroxide solution,vanadium precipitation and calcination.