摘要
研究了 1,2 -双 ( 1′-苯基 - 3′-甲基 - 5′-氧代吡唑 - 4′-基 )乙二酮 -〔1,2〕( H2 A )与三正辛基氧化膦 ( TOPO )协同萃取 RE( ) ( RE=L a、Pr、Nd、Gd、Dy和 Y)的性能。通过考察萃取剂浓度、溶液酸度和温度对 RE( )萃取平衡的影响 ,确定了萃取机理和萃合物组成 ,求得了半萃取 p H1 /2 值和萃取反应平衡常数 Ks.e.。
The synergistic extraction properties and mechanism of RE(Ⅲ)(RE=La,Pr,Nd,Y,Gd and Dy)with 1,2 bis(1' phenyl 3' methyl 5' pyrazolone 4' yl)ethanedione [1,2](H 2A)and tributyl phosphate(TOPO)have been studied in nitric acid solution at 30±1℃.The results show that there is a notable synergistic effect on La 3+ for H 2A+TOPO system,and the synergistic extraction coefficient of La 3+ is calculated to be 4.4.By investigating the influence of concentrations of H 2A and TOPO on the extraction of La 3+ ,the composition of the extracted compound is determined as LaA·HA·TOPO.The half extraction pH 1/2 values of La 3+ ,Pr 3+ ,Nd 3+ ,Y 3+ ,Gd 3+ and Dy 3+ are 3 65,3 05,2 78,2 63,2 46 and 2 36,respectively.Meanwhile,the extraction equilibrium constants,enthalpy change and entropy change of the reaction are also calculated.
出处
《稀土》
EI
CAS
CSCD
北大核心
2001年第1期1-4,共4页
Chinese Rare Earths
