硫酸体系中N_(235)萃钒的性能及其机制研究  

Vanadium Extraction Performance and Mechanism by N_(235) from Sulphate Solution

作　　者：朱如龙[1] 魏昶[1] 李兴彬[1] 荣浩[1] 李存兄[1] 李旻廷[1] 

机构地区：[1]昆明理工大学冶金与能源工程学院,云南昆明650093

出　　处：《稀有金属》2015年第4期337-342,共6页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51174104;51304093);高等学校博士学科点专项科研基金项目(20115314110001)资助

摘　　要：研究了硫酸体系中质子化的叔胺类萃取剂N235对钒萃取性能的影响及萃取机制。实验过程中考察了萃取振荡时间、水相初始p H、萃取剂浓度、SO2-4浓度对钒萃取性能的影响。结果表明：在有机相组成为5%N235＋5%仲辛醇＋90%磺化煤油,相比（O/A）为1∶2的条件下,N235萃取钒的平衡时间为2 min;水相初始p H在2.5~4.0之间时,钒的萃取率随初始p H的增大略微下降;当初始p H为2.5时,钒的萃取率达到最大,为94.46%。SO2-4离子浓度对萃取率有一定的影响,萃取率随其浓度的增加而减小;萃取率随着N235初始浓度的增加而增大,浓度过大不利于萃取过程的进行。当水相p H为2.0~4.0时,水相中钒主要以H2V10O4-28,HV10O5-28等络合阴离子形式存在。采用饱和容量法和等摩尔系列法研究了N235对钒的萃取机制,当水相平衡p H值为2.0时,萃合物中钒与N235的摩尔比,即萃合比（[V]/[N235]）为2.5;平衡p H为4.0时,萃合比为2.0,并分别得到了相应的萃取方程。The vanadium extraction performance and mechanism by protonated tertiary amine-N235 from sulphate solution were investi- gated. The effects of extraction time, initial pH of aqueous phase, concentrations of extractant and SOl- anion on vanadium extraction were also examined in the extraction process. The results indicated that the extraction of vanadium by 5% N235 ＋ 5% sec-octyl alcohol in sulfonated kerosene reached equilibrium in about 2 min at phase ratio（O/A） of 1：2. With the initial pH ranging from 2.5 to 4.0, the increase in pH caused a slight decrease in the extraction efficiency of vanadium, and the maximum vanadium extraction of 94.46% was obtained at pH of 2.5. The concentration of SO2/4- had an effect on vanadium extraction. A decreasing extraction percent for vanadi- um could be observed with the increase of SOl- anion concentration; the extraction efficiency increased with the increase of N235 concen- tration and excessive concentration was not conducive to the extraction process. Vanadium species were mainly suggested to be H2VO-, HV10O5/28- within the pH .region of 2.0 -4.0. The vanadium extraction mechanism by N235 was determined by saturated capacity method and isomolar series method. The extracting proportions （ [ V ] / [ N2351 ） of the extracted complex were 2.5 and 2.0, respectively, at the extraction equilibrium pH of 2.0 and 4.0. Finally the extraction equations were obtained at different equilibrium pH values.

关 键 词：N235 钒 硫酸体系 萃取机制 

分 类 号：TF804.2[冶金工程—有色金属冶金]