混合澄清槽澄清室内流场特性测量

混合澄清槽被广泛应用于稀土溶剂萃取过程，在澄清室内的分相过程是非常重要的环节。采用粒子图像测速技术对澄清室内速度流场进行了测量，比较了不同操作参数下，主要包括混合室搅拌转速、油水两相体积分数以及不同挡板设计对澄清室内流场结构的影响。搅拌转速作为能耗输入，与澄清室内速度矢量大小呈正相关关系；增加油相后，对澄清室内流场结构影响不大，但会使得流动方向发生变化，且使得湍动增加。挡板设计是强化澄清室分相性能的重要途径，对不同挡板组合的澄清室设计进行了测量分析，对挡板形状（Ⅴ形与矩形）、挡板数量与安置位置的影响进行了比较，并采用电导率仪获得澄清室水相出口处溶解性总固体浓度，表征油相夹带情况，对不同挡板设计进行了比较和优化。

Measurement of flow characteristics of settler in mixer-settler

The mixer-settler is widely used in the rare earth solvent extraction process, and the phase separation process in the settler is very important. The velocity flow field in settler was measured by particle image velocimetry(PIV). Different operational parameters were estimated to study the flow characteristics in settler. These parameters were impeller speed in mixer, volume fraction of organic phase, and different baffle designs. The magnitude of velocity vector in settler had positive correlation with the impeller speed, which could be considered as energy input. The volume fraction of organic phase had little influence on the flow pattern. But it changed the flow direction of the aqueous phase, and strengthened the turbulence in settler. Adding baffle is a promising method to improve the performance of settling. The impact of number and position of baffles in settler on flow structure were surveyed and analyzed. Moreover, the entrainment in aqueous outlet was obtained by conductivity meter, giving clues for comparison and optimization of settler.