摘要
硫酸稀土溶液是稀土分离过程中的重要中间产品,皂化剂引入的Na+,NH4+等离子易导致硫酸稀土复盐沉淀,制约了皂化萃取剂在硫酸体系中萃取稀土元素的工业应用。提出了一个在硫酸体系中引入阻断剂实现皂化萃取稀土的工艺设想,并给出了阻断剂的选取方法。利用萃取分离过程中一价阳离子、阻断剂离子和稀土离子按萃取顺序在槽体中形成的自然分布,隔断一价阳离子与稀土离子的接触,从而避免了难溶硫酸稀土复盐的生成,为工业实现硫酸体系皂化萃取稀土提供了可能。
As an important intermediate material in rare earth （RE） industry, RE sulfate solution had not been directly used in the extraction of rare earths by saponified extractants because of the resultant poor dissoluble RE double sulfates with Na＋ （or NH4＋） from saponifier. A proposal of introducing a barrier a- gent was therefore developed to extract rare earths in sulfates using saponified extractants and a standard of barrier agent selection had been suggested. The natu- ral distribution of univalent cations, barrier cations and rare earth ions in extraction stages, controlled by their extraction order, could be exploited to barrier the direct contact of univalent cations and rare earth ions, and thereby the formation of poor dissoluble RE double sulfates could be avoided. The study provided the pos- sibility for saponified extractants to directly extract and separate rare earths from sulfate solution in industry.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2012年第5期533-537,共5页
Journal of the Chinese Society of Rare Earths
基金
科技部国家高技术研究发展计划(863计划)资助项目(2010AA03A405)
关键词
阻断剂
硫酸复盐
萃取
皂化
稀土
barrier agent
double sulfates
extraction
saponification
rare earths
