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本文以恒界面池法研究了HNO3介质中TiAP对Th(Ⅳ)的萃取动力学性质.在一定条件下,考察了萃取时间对萃取率的影响,并测定了搅拌速度、温度、界面积以及各反应物初始浓度对萃取速率的影响.实验结果表明:萃取体系在约6h后达到平衡;搅拌速度(120-180rpm)对萃取速率无显著影响,萃取反应的活化能为23.20kJ/mol,萃取过程为界面反应的混合控制模型.在HNO3介质中,TiAP萃取Th(Ⅳ)的化学反应速率方程为:r=-dcTh(NO3)4/dt=k[Th(NO3)4]1.05[TiAP]1.77[HNO3]0.38,其中,k=1.6×10-2(mol/L)-2.2·s-1.
In this paper, the extraction kinetics of Ti (Ⅳ) in HNO3 media was studied by constant cell pooling method. Under certain conditions, the influence of extraction time on the extraction rate was investigated. The stirring speed, temperature, The initial concentration of reactants on the extraction rate.The experimental results show that: the extraction system reaches equilibrium after about 6h; the stirring speed (120-180rpm) has no significant effect on the extraction rate, the activation energy of the extraction reaction is 23.20kJ / mol, the extraction process As a mixed control model of interfacial reaction.In the HNO3 medium, the chemical reaction rate equation of ThAP for TiAP extraction is: r = -dcTh (NO3) 4 / dt = k [Th (NO3) 4] 1.05 [TiAP] 1.77 [HNO3] 0.38, where k = 1.6 × 10-2 (mol / L) -2.2 · s-1.