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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。
The kinetics of Co (II) extraction from sodium soap (Na-DDPA) of didecylphosphinic acid (DDPA) in sulfate solution was studied using a modified Lewis cell. The effects of stirring speed, temperature, interface area, sodium soap concentration and cobalt ion concentration on extraction rate were investigated. When the stirring speed is in the range of 95 ~ 110r / min, the influence of diffusion resistance on the extraction rate can be neglected. Extraction rate increases with increasing temperature and interfacial area. The calculated activation energy was 32.75 kJ / mol. It shows that Co (II) is a chemical reaction controlled by Na-DDPA and the interfacial chemical reaction is the control step of Co (II) extraction. The extraction rate increased with the increase of Na-DDPA and Co (II) concentration. The cobalt extraction kinetic equation was obtained and the extraction mechanism was discussed.