摘要
利用水相酸度可控的恒定界面池，研究了在２９８±０．５Ｋ下２－乙基己基膦酸单（２－乙基己基）酯－加氢煤油Ｎａ＿２ＳＯ＿４体系萃取钇的动力学，以及在动力学坪区，Ｙ^（３＋）离子浓度、萃取剂浓度、酸度及水相ＳＯ和Ｃｌ－离子浓度对萃取反应速率的影响，并探讨了可能的萃取机理。实验结果表明，萃取过程为扩散和化学反应混合控制过程。在动力学坪区，萃取过程的速率决定步骤发生在两相界面处。
Kinetics of extracting yttrium from sulphate media with mono-(2-ethylhexyl)2-ethylhexyl phosphoric acid(HEHEHP)is studied in a constant interfacial area reaction cell.The effect of stirring rate and interfacial area on extraction rate is investigated.In the kinetic region,the effect of concentrations of yttrium ion,hydrogen ion,HEHEHP,chloride and sulphate ions on extraction rate is also studied.Furthermore,the kinetic mechanism of extraction is discussed based on the experimental results and the interfacial properties of HEHEHP. The experimental results show that the extraction process may be governed by the mixed mechanism of diffusion and chemical reactions,In the kinetic region,the extraction process might be controlled by interfacial chemical reactions.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
1996年第4期213-217,共5页
Journal of Nuclear and Radiochemistry
关键词
动力学
萃取
钇
HEHEHP
Kinetic studies Extraction Yttrium HEHEHP
