The Microemulsion Act Vanadium Extraction From The Highly Alkaline Environment

Microemulsion extraction of Vanadium from strong base system(NaOH solution) was studied by means of two aspects, the preparation of microemulsion and microemulsion extraction of Vanadium, in this paper. Effect of various factors on perparation of microemulsion and extraction yield of Vanadium were discussed. Testing showed that this subject was feasible. Some main results of testing research were as follows:Vanadium being as VO43-under strongly alkaline, N263 that can be stable in acidity or alkaline solution and can be used to extraction in high pH value system is chose as extractant, and also N263 as surfactant for its strong surfactivity. N263, together with short-chain alcohols as cosurfactant, kerosene as continuous phase was prepared the thermodynamic steady microemulsion. Effect of many factors, such as surfactant concentration,the kinds and concentration of cosurfactant, inner water phase salinity and pH value, on water content of the microemulsion were studied. the result shows:the water content of microemulsion increased as a straight line basically with the increase of the N263 concentration. It firstly increased to a maximum and then decreased with a subsequent slow decrease to a flatform with the increase of the alcohol concentration. The addition of salinity and pH of the internal water phase would reduce the water concent of microemulsion.The microemulsion perpared were used for the extraction of Vanadium. The effect of volume ratio of aqueous to microemulsion(R) , extraction time ,temperture, the concentraction of surfactant, alcohol, the concentraction feedliquor NaOH, salinity and pH of the internal water phase on extraction of Vanadium were investigated. The result shows: when volume ratio of aqueous to microemulsion(R) was less than five , the right little effect on the extraction rate of vanadium. when volume ratio of aqueous to microemulsion(R) greater than five , the extraction yield decreased with the increase of volume ratio of aqueous to microemulsion(R), increased with the increase of surfactant; it firstly increased to a maximum and then decreased with a subsequent slow decrease with alcohol, reduced with the increase of the concentraction feedliquor NaOH. when the extraction time was 6min, extraction temperature was about 35℃, the extraction efficiency was ideal.The results from the investigation shows: microemulsion extraction of Vanadium from strong base system(NaOH solution) is technically feasible and has high application value in practice. The research of this subject, not only supplies a large number of datums for the intensive study of microemulsion extrction, but also provides sufficient theory basis for further studies on microemulsion extraction of Vanadium from alumina production process and industrialization.