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采用浅床技术分别研究了料液浓度、操作温度以及料液流速对用亚铁氰化钛钾无机离子交换剂从硝酸铯溶液中交换Cs+的总传质系数的影响。结果表明,随着料液浓度的上升,总传质系数变化不大,仅在q (交换剂相Cs+浓度) 较高时呈微弱的下降趋势。在实验范围内,随着操作温度的升高,总传质系数相应升高。料液流速对亚铁氰化钛钾交换Cs+的总传质系数的影响最大,其影响分为两个阶段:当q<0.25mmol/ml时,对一定的料液流速,总传质系数随着q值增加而较快下降;对一定的q值,总传质系数随着料液流速增加而增加。当q≥0.25mmol/ml时,对一定的料液流速,总传质系数随着q值增加缓慢下降;对一定的q值,不同料液流速下的总传质系数几乎没有区别。总之,当q值较小时,传质过程由液膜扩散和交换剂粒内扩散共同控制;当q值较大时,液膜扩散阻力相对于交换剂粒内扩散阻力要小得多,传质过程由交换剂粒内扩散控制。
The effects of feed concentration, operating temperature and feed flow rate on the total mass transfer coefficients of Cs + exchange from cesium nitrate solution using inorganic potassium titanium ferrocyanide ion exchangers were studied using a shallow bed technique. The results show that with the increase of feed concentration, the total mass transfer coefficient does not change much, and shows a weak downward trend only when q (Cs + concentration of exchanger phase) is relatively high. Within the experimental range, as the operating temperature increases, the total mass transfer coefficient increases accordingly. The effect of feed flow rate on the total mass transfer coefficient of potassium ferrocyanide exchange Cs + is the greatest, and its influence is divided into two stages: when q <0.25mmol / ml, the flow rate, total mass transfer coefficient The value of q increases rapidly and declines rapidly. For a certain q value, the total mass transfer coefficient increases with the increase of feed liquid velocity. When q≥0.25mmol / ml, for a certain feed rate, the total mass transfer coefficient decreases slowly with the increase of q value; for a certain value of q, there is almost no difference between the total mass transfer coefficients at different feed rates. In short, when the q value is small, the mass transfer process is jointly controlled by liquid film diffusion and exchange agent intragranular diffusion. When the q value is large, the liquid film diffusion resistance is much smaller than the intraparticle diffusion resistance and the mass transfer The process is controlled by the intragranular diffusion of exchangers.