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《Chinese Journal of Rare Metals》 2011-01
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Extraction of Vanadium from Sulfuric and Phosphoric Acid Solution

Zhu Jun,Wang Yi,Li Xin,Xue Juanqin,Li Yingsheng(School of Metallurgy,Xi'an University of Architecture and Technology,Xi'an 710055,China)  
The leaching solution by directly activated acid leaching and pre-purifying the high phosphorus vanadium ore was taken as the research object,which was extracted with N263 and back-extracted,the vanadium pentoxide product was obtained by direct precipitation.The influence factors such as aqueous phase equilibrium pH,extractant concentration,additive concentration,O/A,countercurrent extraction and back-extraction stages on vanadium extraction rate in sulfuric and phosphoric acid solution were studied.The results showed that under the optimum conditions of N263 extraction: the extraction solvent consisting of 15% N263-5% DL-2-octanol-sulfonated kerosene,O/A=1∶ 3,oscillation at room temperature for 10 min,standing at room temperature for 10 min,extraction equilibrium pH=2,countercurrent extraction with 5 stages,the vanadium extraction rate was 99.51%;and under the optimum conditions of back-extraction: the back-extraction solvent consisting of 1 mol·L-1 NH4 OH-4 mol·L-1 NaCl,O/A=1∶ 3,oscillation at room temperature for 10 min,standing at room temperature for 10 min,back-extraction equilibrium pH=8.5,countercurrent extraction with 4 stages,the vanadium back-extraction rate was 99.58%;the purity of vanadium pentoxide product by direct precipitation reached 99.54%,it was satisfied with GB3283-87V2O598 standard.
【Fund】: 国家自然科学基金(50874087)资助项目;; 陕西省重点学科冶金物理化学资助项目
【CateGory Index】: TD98
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