甲基膦酸二甲庚酯对Zr(Ⅳ)的萃取行为  

Extraction of Zr(Ⅳ)With Di(1-Methyl-Heptyl)Methyl Phosphonate From Nitric Acid

作　　者：任冰 唐洪彬[1] 蒋德祥[1] 何辉[1] REN Bing;TANG Hong-bin;JIANG De-xiang;HE Hui(China Institute of Atomic Energy,P.O.Box 275(26),Beijing 102413,China)

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413

出　　处：《核化学与放射化学》2020年第2期85-91,共7页Journal of Nuclear and Radiochemistry

摘　　要：以正十二烷为稀释剂,研究了甲基膦酸二甲庚酯(DMHMP)萃取剂对硝酸介质中Zr(Ⅳ)的萃取性能。从3.0 mol/L HNO 3中萃取Zr(Ⅳ)的分配比与萃取剂浓度及硝酸根浓度的关系表明:萃取过程中DMHMP以中性萃取剂形式与Zr(Ⅳ)配位,萃取反应方程式主要为:Zr^4++2DMHMP+4NO-3=Zr(NO 3)4·2DMHMP随着硝酸浓度的增大,还会生成Zr(NO 3)4·2DMHMP·2HNO 3和Zr(NO 3)4·2DMHMP·3HNO 3。该反应为放热反应,降低温度有利于DMHMP对Zr(Ⅳ)的萃取。The extraction of Zr(Ⅳ)from nitric acid medium by using di(1-methyl-heptyl)methyl phosphonate(DMHMP)in n-dodecane was studied.The results show that with 3.0 mol/L nitric acid as aqueous phase,the DMHMP molecules coordinate to Zr(Ⅳ)as neutral extraction agent in the extracted complex,and the extraction equation is deduced from the dependency of D(Zr)on the concentrations of extractant in the organic phase and the concentrations of nitrate ion in the aqueous phase.The detailed extraction equation is mainly as follows.Zr^4++2DMHMP+4NO-3=Zr(NO 3)4·2DMHMP There also are Zr(NO 3)4·2DMHMP·2HNO 3 and Zr(NO 3)4·2DMHMP·3HNO 3 with the increase of the concentration of nitric acid.The extraction is an exothermic reaction,which shows that decreasing reaction temperature is good to the extraction of Zr(Ⅳ).

关 键 词：甲基膦酸二甲庚酯 萃取 硝酸锆 正十二烷 

分 类 号：TL249[核科学技术—核燃料循环与材料]