从高浓度钼酸钠溶液中萃取除钨的研究  

Study on Tungsten Extraction Removal from High Concentration Sodium Molybdate Solution

作　　者：王傲难 肖连生[1,2] 曹佐英[1,2] 张贵清[1,2] 李青刚[1,2] 曾理[1,2] 关文娟[1,2] 

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2期13-19,共7页Rare Metals and Cemented Carbides

基　　金：国家自然科学基金项目(51374238)

摘　　要：采用伯胺类萃取剂HBDW-201从高浓度钼酸钠溶液中选择性萃取钨,考察了有机相组成、萃取温度、接触时间、料液pH值、相比等对钨钼萃取分离的影响,探索了从负载有机相中洗脱Mo及反萃W的条件。结果表明,在有机相组成为20%HBDW-201+磺化煤油、料液含WO_330g/L左右、Mo 100g/L左右,pH值为7.55,萃取相比O/A=1.5∶1、温度25℃、接触时间10min的条件下,经过4级逆流萃取,W萃取率接近100%,Mo萃取率为13.31%,最终得到含Mo 80g/L以上的钼酸钠溶液,溶液中WO_3浓度小于5×10^(-6) g/L,实现了从高浓度钼酸钠溶液中深度除钨;采用0.6mol/L的NaOH溶液为洗涤剂,在相比O/A=5∶1,温度30℃的条件下洗涤负载有机相,Mo洗脱率为61.86%,W洗脱率为11.38%,洗水中Mo与W质量比为2.30;采用2mol/L的NaOH为反萃剂,在相比O/A=5∶1,温度30℃,接触时间10min的条件下进行反萃,W的单级反萃率达99%以上,Mo反萃率为97.39%,得到反萃液中含WO_379.67g/L,Mo 16.30g/L,可用现有的钨钼分离工艺进行进一步处理。Primary amine extractant HBDW-201 was used to selectively extract tungsten from high concen- tration sodium molybdate solution. The effects were investigated of extractant composition, reaction tem- perature,contact time,feed pH value,and phase ratio on extraction separation of tungsten and molybde- num. The conditions of Mo elution and W stripping from loaded organic phase were also studied. The re- sults show that tungsten extraction rate can be close to 100% and the molybdenum extraction rate reaches 13.31% after the four-stage countercurrent extraction under the conditions of extractant composition of 20% HBDW-201 and sulfonated kerosene,feed solution containing about 30 g/L WO3,100 g/L Mo,feed pH= 7.55,and phase ratio O/A= 1.5 ： 1,temperature of 25 ℃ and contact time of 10 min,and the finally obtained sodium molybdate solution contains more than 80 g/L Mo and less than 5 × 10^- 6 g/L WO3. Thus, deep removal of tungsten from high concentration sodium molybdate solution can be achieved with this method. Using 0.6 mol/L NaOH as the eluent,Mo elution rate is 61.86%,W elution rate is 11.38% andthe mass ratio of Mo and W is 2.30 in washing water by washing the organic phase under the conditions of phase ratio O/A= 5 ： 1 and 30 ℃ Using 2 mol/L NaOH as stripping agent under the conditions of O/A= 5： 1,30 ℃ temperature and 10 rain contact time,W single-stage stripping rate reaches over 99% ,Mo strip- ping rate reaches 97.39% ,and the stripping solution with 79.67 g/L WO3 and 16.30 g/L Mo is obtained, which could be further treated by the existing tungsten and molybdenum separation process.

关 键 词：W MO 高浓度钼酸钠 伯胺 萃取 分离 反萃 

分 类 号：TF804.2[冶金工程—有色金属冶金]