摘要
采用层流恒界面池法研究了2-乙基己基膦酸单2-乙基己基酯(HEH/EHP)萃取含氟复杂硫酸体系中铈(Ⅳ)的动力学。考察了搅拌速度、水相金属离子浓度、萃取剂浓度、酸度和温度对萃取速率的影响。试验结果表明:萃取反应为一级反应,萃取反应的正向表观活化能为50.8 kJ·mol-1,属于化学反应控制。试验得到萃取动力学方程为R=k[Ce(HF)(HSO4-)3+]1.05[H2A2]2.07[H+]-2.43,并探讨了反应机制。
The kinetic of cerium（Ⅳ） extraction with HEH/EHP in fluorine-containing sulfuric acid system was studied by using a constant interfacial cell with laminar flow.The effects of stirring speed,concentrations of cerium（Ⅳ） and HEH/EHP,acidity and temperature on the extraction rate were examined.The experimental results indicated that the extraction reaction was first order reaction,the apparent activation energy was 50.8 kJ · mol-1.And the mass transfer of cerium（Ⅳ） was controlled by chemical reaction.The extraction rate equation was R=k[Ce（HF）（HSO4-）3＋]1.052.07-2.43.The mechanism of extraction was also discussed.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2012年第3期278-283,共6页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金重点项目(50934004)
国家发改委重大产业技术开发专项(发改办高技[2009]606号)
水体污染与治理科技重大专项(2009ZX07529-005)资助
