Research on Solvent Extraction for Separation of Vanadium and Chromium
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摘要: 采用O216—3#惰性溶剂为萃取剂溶液,以钠化焙烧钒铬渣浸出液为原料,研究了浸出液萃前pH值、萃取剂溶液浓度、萃取温度、萃取反应时间、相比等因素对钒铬的萃取分离的效果,测定最佳工艺下萃取剂溶液的饱和容量。得到的最佳工艺条件为:浸出液pH为1.8、体积浓度为40%、温度为30℃、萃取时间为5 min、相比为1∶1,钒的单级萃取率达98.79%、铬的单级萃取率达36.42%,分离系数为142.90;O216萃取剂溶液对于钒铬的饱和容量分别为:V2O5:41.46 g/L,Cr2O3:3.62 g/L。O216—3#惰性溶剂为萃取剂溶液用于钒铬分离,具有良好的分离效果。Abstract: Using the O216 synthesized in laboratory and 3# inert solvent as the extraction solution and the leaching solution from sodium roasting of V-Cr slag as raw material,the effects of pH of the leaching solution,concentration of the extraction solution,extraction temperature,extraction time and phase ratio on the separation efficiency of V and Cr were studied.The saturation capacity of the extraction solution under the optimum conditions was determined.The optimum conditions are shown as follows:the leaching solution pH of 1.8,the volume concentration of 40% for the extraction solution,the extraction temperature of 30℃,the extraction time of 5 min,and the phase ratio of 1:1.The single stage extraction rate of vanadium and chromium are 98.79% and 36.42% respectively,with the separation factor at 142.90.The saturation capacity of O216 extraction solution for vanadium and chromium is respectively 41.46 g/L of V2O5 and 3.62 g/L of Cr2O3.It shows an effective separation of vanadium and chromium in the extraction solution of O216-3# inert solvent.
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Key words:
- vanadium-chromium slag /
- vanadium /
- chromium /
- solvent extraction /
- separation
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