Kinetics of cobalt(Ⅱ) extraction from sulfate aqueous solution by sodium salt of di-decylphosphinic acid (DDPA)  

硫酸盐溶液中二癸基次膦酸的钠皂萃取Co(Ⅱ)动力学(英文)

作　　者：邢鹏[1] 王成彦[1] 徐盛明[2] 居中军[1] 

机构地区：[1]北京矿冶研究总院冶金研究设计所,北京100070 [2]清华大学核能与新能源技术研究院,北京100084

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第2期517-523,共7页中国有色金属学报（英文版）

基　　金：Projects (50734005, 51074096) supported by the National Natural Science Foundation of China;Project (2012AA06A110) supported by the Hitech Research and Development Program of China;Project (2012BAB07B01) supported by the National Key Technology R&D Program, China

摘　　要：Kinetics of Co（II） extraction from sulfate aqueous solution by the sodium salt of di-decylphosphinic acid （Na-DDPA） was studied using a modified Lewis cell to disclose the mechanism of extraction. Parameters affecting the extraction rate, such as stirring speed, temperature, interfacial area, Na-DDPA concentration and Co（II） concentration, were investigated, respectively. The effect of diffusion resistance on extraction rate was negligible when the stirring operation was conducted in a plateau region of 95-110 r/min. Extraction rate increased with the increase in the temperature or specific interfacial area. The activation energy E was calculated to be 32.75 kJ/mol. These suggested that rate controlling mechanism of Co（II） extraction by Na-DDPA was chemical reaction regime and the rate-determining step of Co（II） extraction was chemical reaction at the interface. The initial extraction rate also increased with the increase in the concentrations of Na-DDPA and Co（II）. The extraction rate equation and mechanism of Co（II） extraction by Na-DDPA were proposed.用改进的Lewis槽研究了硫酸盐溶液中二癸基次膦酸（DDPA）的钠皂（Na-DDPA）萃取Co（II）动力学。分别考查了搅拌速度、温度、界面面积、钠皂浓度、钴离子浓度对萃取速率的影响。当搅拌速度在95~110r/min范围时,扩散阻力对萃取速率的影响可以忽略。萃取速率随着温度和比界面面积的增大而增大。计算得活化能为32.75kJ/mol。表明Na-DDPA萃取Co（II）为化学反应控制过程,Co（II）萃取的控制步骤为界面化学反应。萃取速率随着Na-DDPA和Co（II）浓度的增大而增大。得到了钴萃取动力学方程并讨论了萃取机理。

关 键 词：di-decylphosphinic acid COBALT extraction kinetics EXTRACTION 

分 类 号：TQ028.32[化学工程]