三正辛胺从HCl介质中萃取钯(II)的动力学研究(英文)  

Research on Kinetics of Extraction of Palladium(II) from Hydrochloric Acid Solution by Tri-n-octylamine in O-xylene

作　　者：张钦发[1] 龚竹青[2] 

机构地区：[1]华南农业大学食品学院,广州广东510642 [2]中南大学冶金科学与工程学院,长沙湖南410083

出　　处：《贵金属》2007年第4期35-40,共6页Precious Metals

摘　　要：研究了三正辛胺从HCl介质中萃取Pd(II)的动力学和萃取机理,结果表明:三正辛胺和Cl-的质量浓度对萃取速率有较大的影响,ln(kf(Pd)/kb(Pd))与lnCoTOA和ln[Cl-]分别成直线关系,直线斜率分别为2和-2。界面反应步骤是TOA萃取Pd(II)速率的控制步骤,正向萃取反应活化能为21.154kJ·mol-1,推导得出了萃取速率和正、逆向萃取速率常数比(kf(Pd)/kb(Pd))的理论方程,当[Cl-]≥0.10mol·L-1或[H+]≥0.10mol.L-1时,理论计算值与实测值吻合。The kinetics and mechanism of extraction of palladium（Ⅱ） from HC1 solution by tri-n-octylamine （TOA） in o-xylene were studied. The extraction rate depends on the concentration of TOA and CI^-, and the rate-determining step is interfacial reaction. The plots of ln（kfo,d）/kb（ed）） versus lnCIToA and ln[Cl] lie on a straight line with slopes of 2 and -2, respectively. The activation energy（Ea） of forward extraction reaction of palladium（Ⅱ） by TOA is 21.15410.mol1. Theoretical equations of extraction rate and ratio of kf（Pd） of kb（Pd）, were deduced. The results calculated by the theoretical equation are in agreement with the experimental results when [Cl^-]≥0.10mo1·L^-1 or [H^＋]≥0.10mo1·L^-1.

关 键 词：湿法冶金 钯 三正辛胺 萃取动力学 

分 类 号：TF111.3[冶金工程—冶金物理化学]