Microemulsion Of Sodium Aluminate Solution Was Extracted Vanadium Process

The principle of microemulsion solution extracting vanadium from sodium aluminate solution was discussed in this paper. In microemulsion solution system of N263- isoamyl alcohol- kerosene-sodium hydroxide, the effects of many factors, such as the concentration of N263, the concentration of cosurfactant isoamyl alcohol, the concentration of alkali in internat water phase, the volume ratio of aqueous to microemulsion(R), the concentration of alkali of feed liquid, temperature, agitation intensity and extraction time, on the separation of aluminium and vanadium, were explored, and optimum conditions were obtained by orthogonal experiment method. The microemulsion after extraction contains impurity of aluminum, which was removed through abstersion. The effects of the concentration of extract component, ratio of microemulsion to the water volume, temperature, agitation intensity and abstersion time on the aluminum removal was studied and the optimum conditions were obtained. And the back extraction vanadium from vanadium-riched microemulsion was also explored and the optimum conditions were ascertioned through single factor selecting method.The results as follows:In extraction experiments, on conditions that the concentration of Al2O3, Na2O and V2O5 were 20.4g/L, 14.88g/Land 1g/L respectively in sodium-aluminate-vanadate solution, the optimum conditions were as follows: the concentration of surfactant N263 and cosurfactant isoamyl alcohol were 10% and 20% respectively, the volume ratio of aqueous to microemulsion(R) was 3, the concentration of alkali in internat water phase is 0.4mol/L, extraction time was 5 minutes, agitation intensity was 200 r/min and the temperature was 50℃. The extraction rate of vanadium reached 85%, and the separation coefficient of vanadium and aluminum was 62. The concentration of vanadium and Al2O3 in organic phase after extration were 2.560 g/L and 1.642 g/L respectively.In abstersion experiments, the optimum conditions of removing aluminum were as follows: the extraction wash solution contained 4g/L NaOH and 3 g/L V2O5, the volume ratio of microemulsion and wash solution was 3, time was 6 minutes, agitation intensity was 200 r/min and the temperature was 40℃. The aluminum abstersion rate reached 99.5%. The concentration of Al2O3 and V2O5 after abstersion were 4.9g/L and 0.645g/L respectively in aqueous phase, which can be returned to re-extraction in the process of extration. And contrastively the concentration of Al2O3 and V2O5 after abstersion were 8 mg/L and 3.450 g/L respectively in microemulsion.In back-extraction experiments, the optimum conditions of back-extract vanadium were as follows: back-extraction solvent was consisted by 1.0mol/LNaOH and 0.6mol/LNaCl, back-extraction time was 3min,temperature was 60℃, the volume ratio of microemulsion to back-extraction solution was 6. The concentration of Al2O3 and V2O5 were 36mg/L and 20.7g/L respectively in back-extraction solution.