溶液配位环境对P204萃取钒(Ⅳ)的影响研究  

Effect of Solution Coordination Environment on Extraction of Vanadium(Ⅳ)by P204

作　　者：王忆平 薛楠楠[1,2,3] 张一敏 刘红[1,2,3] 胡鹏程 WANG Yiping;XUE Nannan;ZHANG Yimin;LIU Hong;HU Pengcheng(School of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control,Wuhan 430081,China;Collaborative Innovation Center of Strategic Vanadium Resources Utilization,Wuhan 430081,China;Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource,Wuhan 430081,China)

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]国家环境保护矿冶资源利用与污染控制重点实验室,湖北武汉430081 [3]战略钒资源利用省部共建协同创新中心,湖北武汉430081 [4]湖北省页岩钒资源高效清洁利用工程技术研究中心,湖北武汉430081

出　　处：《湿法冶金》2024年第1期53-59,共7页Hydrometallurgy of China

基　　金：国家自然科学基金面上项目(52174260);湖北省教育厅科学研究计划重点项目(D20221104)。

摘　　要：研究了溶液配位环境对P204萃取钒(Ⅳ)的影响,考察了氯离子、氟离子和硫酸根离子在不同pH条件下对钒萃取效果的影响及其与钒的配位情况。结果表明:在有机相组成为20%P204+5%TBP+75%磺化煤油、相比VO/VA=1/2、萃取时间8 min条件下,氯离子可有效强化钒的萃取;在pH=1.0、[Cl^(-)]=5 mol/L条件下,钒萃取率达87.93%;pH=1.4~2.2时,一定浓度范围内的氟离子能促进萃取,[F^(-)]=0.05 mol/L时促进萃取效果最佳,[Cl^(-)]大于0.2 mol/L会抑制萃取;pH=1.8、2.2时,[SO_(4)^(2-)]对钒萃取效果影响不大,但pH=1.0、[SO_(4)^(2-)]=1.5 mol/L时,钒萃取率仅为52.22%,高浓度SO_(4)^(2-)会明显抑制钒的萃取;热力学研究表明,VOCl^(+)和VOF^(+)配位阳离子可强化钒萃取过程,[F^(-)]高于0.2 mol/L时,VO2+与多个F^(-)形成配位阴离子VOF3阻碍了P204阳离子交换反应的进行。The effects of solution coordination environment on the extraction of vanadium by P204 were investigated.The effects of chloride,fluoride and sulfate ions on the extraction of vanadium and their coordination with vanadium were examined at different pH.The results show that for the extractant using an organic phase composition of 20%P204+5%TBP+75%sulfonated kerosene,at phase ratio of V_(O)/V_(A)=1/2 and extraction time of 8 min,chloride ions can effectively enhance vanadium extraction.At pH=1.0 and[Cl^(-)]=5 mol/L,the vanadium extraction can reach 87.93%.When the pH is 1.4~2.2,fluoride ions in a certain concentration range can promote the extraction,and the best promotion effect is achieved when[F^(-)]=0.05 mol/L.The concentration of fluoride ion is greater than 0.2 mol/L,and the extraction is inhibited.When pH=1.8 and 2.2,the concentration of sulfate has little effect on vanadium extraction.But when pH=1.0 and[SO_(4)^(2-)]=1.5 mol/L,the vanadium extraction rate is only 52.22%,and the high concentration of sulfate can significantly inhibit vanadium extraction.The thermodynamic results show that coordination groups VOCl^(+)and VOF^(+)can enhance vanadium extraction process.When the concentration of fluoride ion is higher than 0.2 mol/L,the coordination anion VOF 3 formed by VO 2+and multiple F-prevents the cation exchange reaction of P204.

关 键 词：钒 溶剂萃取 配位调控 P204 热力学 

分 类 号：TF804.2[冶金工程—有色金属冶金] TF841.3