Study on Extraction Separation of Non-roasting Acid Leachate of Vanadium Slag

Extracting-stripping process was used to separate vanadium from other elements in the acid leaching solution of vanadium slag without roasting.The effects of extraction temperature,extraction time,pH value,composition of extraction agent,extraction phase ratio,stripping time,acid concentration and stripping phase ratio on the extraction rate and stripping rate of vanadium were investigated by single factor experiments.The results indicate that the extraction rate of V and Fe is respectively 74.49% and 1.92% without any other impurity ion in organic phase,under the temperature of 20℃,leaching solution pH=2.0,organic phase composition of 20% P204+5% TBP+75% sulfonated kerosene,phase ratio (O/A)=1:1 and shaking time of 5 min;the total extraction rate of V is 97.89% after 4-stage cross-flow extractions under the conditions mentioned above.The stripping experiment results indicate that,under the stripping time of 4 min,acid concentration of 200 g/L and phase ratio (O/A) of 5:1,the stripping rate of vanadium is 98.58% without iron ions in the water phase.