摘要
对P507-N235双溶剂萃取体系的反萃性能及后续的沉淀工艺进行了研究,考察盐酸对稀土钕负载有机相的反萃取情况、草酸对稀土后液的沉淀情况。结果表明:P507-N235-磺化煤油-环己烷体系较容易反萃,反萃过程中分相效果良好;负载有机相中所含稀土浓度对反萃过程基本无影响,室温下其最佳反萃条件为:振荡时间15 min,相比1∶1,酸度约3 mol·L-1,其单级反萃率可达到98%以上,1 min左右即可分相完全。用草酸理论量的115%沉淀稀土钕,沉淀率可达99%。
The stripping performance and subsequent precipitation process of dual solvent （plus sulfonated kerosene and cyclohexane）extraction system were investigated. The stripping ability of hydrochloric acid to neodymium-loaded organic phase and precipitation procedure of oxalic acid on rare earths were studied as an example. The results showed that PSO7-N235-kerosene-cyclohexane system had a good stripping performance. It seemed that the rare earths concentration in load organic phase had no effect on the rare earths stripping process. The optimum stripping conditions at room temperature were determined as follows： oscillation time was 15 min, feed phase proportion 1 ： 1, acidity 3 mol·L^-1, the single-stage stripping rate of Nd 98% or more and complete phase separation in one minute. The precipitation rate reached 99% when rare earth Nd was precipitated with 1.15 times the theoretical amount of oxalic acid.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2013年第6期695-702,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)
江西省自然科学基金(20132BAB206020)
江西省重大科技专项(2010AZD00100)
江西省工业领域科技支撑计划(20123BBE50075)资助
