钾长石与氯化钠离子交换动力学  

Kinetic analysis of ion-exchange process of potash feldspar with sodium chloride

作　　者：韩效钊[1] 胡波[1] 陆亚玲[1] 肖正辉[1] 张卫新[1] 

机构地区：[1]合肥工业大学化学工程学院,安徽合肥230009

出　　处：《化工学报》2006年第9期2201-2206,共6页CIESC Journal

基　　金：安徽省自然科学基金资助项目(03045103).~~

摘　　要：对钾长石与氯化钠反应过程首次使用离子交换动力学模型进行了实验研究.研究表明,不同产地、不同品位的钾长石在与氯化钠进行熔盐离子交换反应时符合相同的离子交换动力学模型.反应初期,内扩散为控制步骤,离子交换过程的表观活化能约为38·06kJ·mol-1;很快化学交换反应逐渐成为控制步骤,离子交换过程的表观活化能约为129·69kJ·mol-1.The kinetics of reaction between the potassium ions from potash feldspar and the sodium ions from solutions was firstly studied by the use of the kinetic model of ion exchange. The research showed that, potash feldspar from different locations of origin and different concentrations of potassium oxide had something similar in the experimental kinetic model of the ion exchange process. The kinetics analysis showed that at the beginning stage inner diffusion was the possible rate-determining step of the ion exchange process. With the progress of the reaction, chemical exchange gradually became the rate- determining step until equilibrium of the ion exchange process was reached. While inner diffusion became the rate-determining step; the apparent activation energy was around 38. 06 kJ · mol^-1. While chemical exchange became the rate-determining step, the apparent activation energy was around 129.69 kJ· mol^-1.

关 键 词：钾长石 离子交换 动力学 

分 类 号：TQ443.5[化学工程—化学肥料工业]