从含钒钨酸铵溶液中萃取分离微量钒的研究  

Investigation on Separation of Trace Vanadium by Extraction from Vanadium-containing Ammonium Tungstate Solution

作　　者：汪流培 张贵清 关文娟 曾理 周钦 夏允 WANG Liu-pei ZHANG Gui-qing GUAN Wen-juan ZENG Li ZHOU Qin XIA Yun(School of Metallurgy and Environment, Central South University, Changsha 410083, China Key Laboratory of Metallurgical Separation Science and Engineering, Central South University, Changsha 410083, China)

机构地区：[1]中南大学冶金与环境学院,湖南长沙410083 [2]中南大学冶金分离科学与工程重点实验室,湖南长沙410083

出　　处：《稀有金属与硬质合金》2017年第4期1-5,33,共6页Rare Metals and Cemented Carbides

基　　金：国家自然科学基金(51374238)

摘　　要：提出以季铵盐碱性萃取法从含钒钨酸铵溶液中深度除V并进行实验研究,考察了有机相组成、平衡水相pH值对萃取过程的影响以及相比对反萃过程的影响。绘制了萃取及反萃等温线并进行模拟逆流串级萃取及反萃实验。结果表明,将含微量钒的钨酸铵溶液先经蒸发脱氨预处理调整溶液pH值至8.7左右,再以组分(体积分数)为1%N263+5%仲辛醇+磺化煤油的有机相,在25℃、相比1.25∶1的条件下进行6级逆流串级萃取后,水相中V含量降至10mg/L以下,W的共萃损失<5%。负载有机相中的V可采用2mol/L NaOH溶液实现完全反萃,反萃后有机相可返回萃取工序连续使用。Alkaline extraction method with quaternary ammonium salt was proposed for deep removal of va- nadium from vanadium-containing ammonium tungstate solution and experimental research was carried out. The effects of organic phase composition and equilibrium aqueous pH on extraction were investigated as well as the effect of O/A ratio on stripping. Isotherms of extraction and stripping were plotted and the simulated multi-stage countercurrent extraction and stripping experiments were conducted. The results show that the concentration of vanadium in the aqueous phase drops below 10 mg/L and tungsten loss is below 5% after six-stage countercurrent extraction under the following conditions： organic phase composi- tion （volume fraction） of 1% N263, 5% 2-octanol and sulfonated kerosene,feed pH of 8.7 （by evaporation deamination pretreatment） ,phase ratio （O/A） of 1.25 ： 1 and 25 ℃. Vanadium in the loaded organic phase can be completely stripped with 2 mol/L NaOH solution,and the stripped organic phase can be returned to the extraction process for recycle.

关 键 词：含钒钨酸铵溶液 除钒 季铵盐 萃取 反萃 蒸发脱氨 

分 类 号：TF841.3[冶金工程—有色金属冶金]