摘要
钒钛磁铁矿冶炼产生的矿渣含有大量钒和其他金属,目前主要采用废气排放量高、能耗较高的碱金属-碱土金属烧结法回收。另一方面,钛白工业生产中会产生大量的高浓度废酸。针对上述问题,采用以钛白废酸作为浸出剂的无焙烧直接加压酸浸提钒新工艺,可实现钒渣中钒与其他有价元素的提取分离和钛白废酸的综合利用。针对钛白废酸加压浸出得到的浸出液中的钒及其他金属元素在P204/TBP/煤油体系中的萃取进行了研究。研究了浸出液p H值、Na2SO3还原剂用量、P204浓度、萃取相比、振荡时间、萃取温度等因素对钒萃取率的影响。结果表明,当有机相的组成(体积分数)为20%P204∶10%TBP∶70%磺化煤油、还原剂含量为31.44 g·L-1、浸出液初始p H=2.5、相比(O/A)=2/1、萃取温度30℃、震荡时间6 min时,钒的一级萃取率达到97.71%,其他主要金属元素铁、镁、锰、铝(萃取率分别为35.90%,14.91%,16.45%,16.87%)被抑制在水相中,使钒与其他金属元素得以分离。
Vanadium titanium magnetite slags contain vanadium and other metals. The most common method of extracting vanadium is alkali-alkaline earth metal sintering process, which is of high emission and high energy consumption. Moreover, titanium dioxide in- dustry produced a large amount of high concentration waste acid. To solve the problems, a new process of pressure leaching of vanadi- um slags with no roasting using titanium dioxide waste acid as leaching agent was applied. Vanadium and other metal elements were ex- tracted and separated effectively. At the same time, titanium dioxide waste acid was utilized comprehensively. The extraction of vanadi- um and other metallic elements in P204/TBP/kerosene system from leaching solution obtained from the process of acid leaching with pressure was studied. The effects of pH of leaching solution, addition of Na2SO3 as reluctant, P204 concentration, phase ratio, shaking time and extraction temperature on the extraction rate of vanadium were investigated. The experimental results showed that the first ex- traction rate was 97.71% when the organic phase composition （volume fraction） was 20% P204： 10% TBP： 70% sulfonated kerosene, the content of reducing agent addition was 31.44 g.L-1, the pH of initial leaching solution was 2.5, the phase ratio （O/A） was 2/1, the extraction temperature was 30 ℃ and the shaking time was 6 min. Other metallic elements extracted with ratios of 35.90%, 14. 91%, 16.45% and 16.87% for ferrum, magnesium, manganese and aluminum, respectively, were restrained in the aqueous phase, which made it possible for vanadium extracted from the other elements.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2015年第3期244-250,共7页
Chinese Journal of Rare Metals
基金
国家科技部高技术研究发展计划("863"计划)项目(2012AA062303)资助
关键词
钒
萃取
浸出液
P204
vanadium
extraction
leaching solution
P204
