LIU Jincai LU Jiufang Tsinghua University
,
Beijing
,
China
金属学报(英文版)
The activity coefficients of all the components in H_2SO_4-CuSO_4 solution were calculated by using Pitzer's equation.Six Pitzer's mixing parameters μ and were evaluted.The change of the activity and concentration of the ions during extraction was measured by drop weight method.The interfacial excesses of all the components were calculated from the interfacial tension equation which is expressed in terms of activities of every components.Results show that H~+ and Cu~(2+) are positively adsorpted by CuR_2,(HR)_2 ,SO_4~(2-) and HSO_4~- are negatively adsorpted on the interface.
关键词:
extraction kinetics
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null
,
null
,
null
YU Jingfen LIU Difei Tsinghua University
,
Beijing
,
China professor
,
Dept.of Chemical Engineering
,
Tsinghua University
,
Beijing 100084
,
China
金属学报(英文版)
The thermodynamics of micella formation,interfacial characteristics,synergistic effects and interfacial kinetics for synergistic extraction system D_2 EHPA-MPA-Fe~(3+) have been studied.It was found that D_2EHPA in the mixed system strongly exhibits the effect on the micella formation thermodynamics and interracial characteristics of MPA.Some ther- modynamic parameters for constants of micelles formation(K_m).free energies of micelles formation(ΔG_m)and critical micella concentrations(CMC)were obtained.The inter- facial adsorption behaviour of D_2EHPA is opposite to that of MPA.The emulsification for single MPA and the mixed system was discussed.The synergistic effects were found in this mixed extraction system.It is proved that the process of the Fe~(3+) extraction for non-mixed extraction system is controlled by chemical reaction and the controlling reaction occurs at the interface.
关键词:
interfacial chemistry
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null
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null
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null
张钦发
,
龚竹青
贵金属
doi:10.3969/j.issn.1004-0676.2007.04.008
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.
关键词:
湿法冶金
,
钯
,
三正辛胺
,
萃取动力学
