P204萃取提钒的应用现状与发展趋势

Current Status and Development Trend of Vanadium Extraction by P204 Extraction

这是一篇冶金工程领域的论文。有机磷类萃取剂D2EHPA(P204)非常广泛地应用于钒的萃取中,首先阐述了钒在浸液中的存在形式影响萃取的效果,V(IV)在溶液中主要以VO^(2+)的形式稳定存在于强酸性溶液中;pH值逐渐增大时,V(V)多以H_(2)V_(10)O_(28)^(4-)、HV_(10)O_(28)^(5-)的形式存在。其次本文以近几年来有机磷类萃取剂P204的研究为基础,分析了有机磷类萃取剂P204的构效关系,发现与磷酰基相邻的基团类型相比,空间位阻效应作为次要因素同样重要,基于氢键作用,萃取剂分子之间会产生二聚体甚至多聚体,从而改变萃取剂分子的结构与性质。最后对P204萃钒的研发与应用进展以及对相关领域的未来进行了展望,指出了P204萃取剂今后的研究方向。

This is a paper in the field of metallurgical engineering.Organophosphorus class extractant D2EHPA(P204)is very widely used in vanadium extraction.Firstly,the form of vanadium present in the leach solution affects the effect of extraction,V(IV)is mainly stable in solution in the form of VO^(2+)in a strongly acidic solution;when the pH value gradually increases,V(V)mostly exists in the form of H_(2)V_(10)O^(4-)_(28)、HV_(10)O^(5-)_(28)and HV_(10)O_(28)^(5-).Secondly,based on the research of organophosphorus extractant P204 in recent years,this paper analyzes the conformational relationship of organophosphorus extractant P204 and finds that the spatial site resistance effect is equally important as a secondary factor compared with the type of phosphoryl adjacent groups,based on the hydrogen bonding effect,the extractant molecules will produce dimers or even multimers between them,thus changing the structure and properties of the extractant molecules.Finally,the progress of the development and application of P204 extractive vanadium and the outlook on the future of the related fields are presented,pointing out the future research directions of P204 extractive agents.