CAJ | 학술논문

采用新型恒界面池法进行了磷酸体系中用P204萃取La(Ⅲ),Sm(Ⅲ)和Y(Ⅲ)的动力学研究,考察了搅拌速度、温度、比界面积、磷酸浓度及萃取剂浓度等因素对萃取速率的影响.结果表明:磷酸体系中用P204萃取La(Ⅲ),Sm(Ⅲ)和Y(Ⅲ)的表观活化能E_a分别为27.0,22.2和21.1 kJ·mol~(-1),在体相P204浓度大于在液一液界面饱和吸附时的最低浓度C_(min)时,其在界面已达到吸附饱和,反应的主通道由界面变为体相,在该体系下P204萃取La(Ⅲ),Sm(Ⅲ)和Y(Ⅲ)反应为体相化学反应和扩散反应混合控制.
채용신형항계면지법진행료린산체계중용P204췌취La(Ⅲ),Sm(Ⅲ)화Y(Ⅲ)적동역학연구,고찰료교반속도、온도、비계면적、린산농도급췌취제농도등인소대췌취속솔적영향.결과표명:린산체계중용P204췌취La(Ⅲ),Sm(Ⅲ)화Y(Ⅲ)적표관활화능E_a분별위27.0,22.2화21.1 kJ·mol~(-1),재체상P204농도대우재액일액계면포화흡부시적최저농도C_(min)시,기재계면이체도흡부포화,반응적주통도유계면변위체상,재해체계하P204췌취La(Ⅲ),Sm(Ⅲ)화Y(Ⅲ)반응위체상화학반응화확산반응혼합공제.
The extraction kinetics of lanthanum, sa-marium and yttrium by P204 from phosphoric acid were investigated using a novel quiescent interface extraction cell with laminar flow. The effects of stirring speed, temperature, specific interface, phosphoric acid con-centration and extraction concentration were studied. The results indicated that the extraction apparent acti-vation energy of lanthanum, samarium and yttrium was calculated to be 27.0, 22.2 and 21.1 kJ·mol~(-1), re-spectively. The reaction channels turned from inter-face to bulk phase when the concentration of P204 ex-ceeded its minimum concentration of interface adsorp-tion saturation. And the extraction process might be controlled by a mixed mechanism of diffusion and chemical reaction.