摘要
稀土萃取分离过程皂化产生的含盐废水严重污染环境。利用P507萃取稀土离子、N235萃取酸的特性,设计了P507-N235双溶剂无皂化稀土萃取体系,研究了双溶剂有机相的稳定性及对Nd3+的协萃效应。P507与N235混合时发生放热现象,红外光谱分析显示其特征峰发生了变化,但32次萃取-再生后的混合萃取剂的化学结构稳定;P507与N235对Nd3+具有显著的协萃效果,形成的萃合物为REA3.(R3N.HA).3R3NHCl。研究结果为无皂化稀土萃取分离新工艺开发提供了依据。
The salty waste water generated by saponification in the rare earth extraction process has greatly given rise to environmental pollution.A double solvent system of P507 and N235,which extract rare earth ions and acids respectively,was designed for rare earth extraction without saponification.The chemical stability and synergistic effect of P507-N235 system for Nd3＋ were investigated and the experimental results showed that chemical structure of the mixed extractants was stable after extraction-regeneration process although mixing of P507 and N235 was an exothermic reaction with changing characteristic peaks in their infrared spectra.A significant synergistic effect was achieved and the as-prepared complex in extraction was REA3 ·（R3N · HA） · 3R3NHCl.The results obtained may contribute to the development of non-saponification rare earth extraction process.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2013年第4期385-392,共8页
Journal of the Chinese Society of Rare Earths
基金
国家高技术研究发展计划(2012AA061901)资助
关键词
协同萃取
P507
N235
无皂化
稀土
synergistic extraction
2-ethylhexylphosphoric acid mono-2-ethylhexyl ester
trioctylamine
non-saponification
rare earths
