【摘要】 根据泡沫分离过程与化学反应过程在物理行为上的类似性,将化学反应过程理论应用于泡沫分离过程,引入等效的化学反应常数,对采用铁盐共沉淀浮选法去除水中的铬离子进行宏观动力学研究.结果表明,当采用一个平衡级时,在最佳分离率的条件下,该浮选过程可等效为一级反应,其等效速率常数k=0.537.通过逗留时间分布测定及分析,得知其平均逗留时间tm=9.85min,方差σ20=0.525.在此基础上,结合相应的实验确定逗留时间分布密度函数,研究流体流动对泡沫分离过程分离率的影响,最终给出减小返混,提高分离率的方法.更多还原

【Abstract】 Because of similarities in the foam separation process and chemical reaction process in physical behavior, the theory of chemical reaction progress is applied to the foam separation process, and the equivalent chemical reaction constant is introduced here. The result indicates that under a balanced state the process of coprecipitation flotation can be regarded as a one grade reaction under the best isolation rate, where the equivalent speed constant is k=0.537, the average resting time is t_m=9.85 min,and the variance is σ²₀=0.525. Combined with the relevant experiment, the distribution density function of resting time was confirmed. The influence factors influencing the foam separation process isolation rate of fluid flowing are studied, and a method for improving isolation rate is given based on reducing back_mixing.更多还原