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为了探索离子交换法吸附回收工业废液中的K+,通过001×7强酸型阳离子树脂吸附KCl溶液中K+的实验,考察了不同KCl溶液浓度、操作温度和树脂粒径下K+的静态吸附特性,并用动边界模型描述树脂吸附K+的过程,确定了吸附过程的速度控制步骤,建立了吸附过程的动力学总方程.结果表明,001×7强酸型阳离子树脂吸附K+的过程为颗粒扩散控制;随着吸附时间增加,静态吸附过程呈现快速吸附阶段、缓慢吸附阶段和吸附平衡阶段的3阶段变化特征;溶液初始K+浓度越大,初始阶段吸附速率越大,达到平衡时溶液的浓度越大、单位树脂吸附量越大、溶液吸附率越低;操作温度升高和树脂粒径减小,均有利于吸附过程进行.
In order to explore the adsorption and recovery of K + in industrial waste liquid by ion exchange method, the adsorption kinetics of K + in KCl solution by 001 × 7 strong acid cation resin was studied. The KCl solution concentration, operating temperature and K + The kinetic equation of the adsorption process was established by using dynamic boundary model to describe the adsorption process of K +, and the kinetic equation of the adsorption process was established. The results showed that the adsorption of K + by the 001 × 7 strong acid cation resin was particle diffusion control. The adsorption time increases, and the static adsorption process exhibits the characteristics of 3 stages of rapid adsorption, slow adsorption and adsorption equilibrium. The larger the initial K + concentration, the larger the initial adsorption rate, and the greater the solution concentration at equilibrium The larger the resin adsorption capacity, the lower the adsorption rate of the solution; the higher the operating temperature and the smaller the resin particle size, are conducive to the adsorption process.