为探明浮选中起泡剂浓度对气泡及其尾涡区特征的影响，预测颗粒在浮选气泡尾涡区的卷吸概率，通过实验室自制的拟上升气泡装置及粒子图像测速系统，研究了不同浓度仲辛醇条件下的气泡尾涡区流场特征，分析了气泡表面流体分离行为及尾涡特征；通过高速摄像系统的同步观测，研究了气泡的形态特征以及颗粒在气泡尾涡区的轨迹和分布概率。研究结果表明：随着起泡剂浓度的增加，气泡的尺寸略有减小而长径比逐渐增大；气泡边界层分离角随起泡剂浓度的增加逐渐增加，存在临界分离角196.70°；气泡引起的尾涡主要集中在流场流速小于0.09 m/s 的区域，气泡尾涡区高度随起泡剂浓度的增加逐渐减小，存在最小尾涡区临界值为气泡直径的1.06 倍；颗粒在气泡尾涡区存在3 种运动轨迹，颗粒卷吸的运动轨迹可以分为3 个显著阶段，颗粒受力是导致其卷吸类型区别的关键因素；随着起泡剂浓度的增加，颗粒被卷吸的范围与概率逐渐减小。影响气泡尾涡及颗粒运动的临界浓度均为1.6×10−4 mol/L。研究结果明晰了起泡剂浓度对矿物颗粒在气泡尾涡区卷吸的机理，为微细矿物浮选技术的发展提供了有价值的指导。

To investigate the effect of frother concentration on bubbles and their tail vortex zone characteristics in flotation is an important prerequisite for predicting the probability of particle coiling in the trailing vortex zone of flotation bubbles. The flow field characteristics of the bubble trailing vortex region under different sec-octyl alcohol (2-octanol) foaming agents were studied by the laboratory homemade proposed rising bubble device and particle image velocimetry system. The fluid separation behavior of the bubble surface and the trailing vortex height characteristics were analyzed. The morphological characteristics of the bubbles and the trajectory and distribution probability of the particles in the bubble wake area were observed with the high-speed camera system. The results of the research are as follows: The size of bubbles slightly decreases and the aspect ratio gradually increases with the increase of the frother concentration. The boundary layer separation angle of the bubbles gradually increases with the increase of the frother concentration, and there is a critical separation angle of 196.70°. The vortex caused by the bubble is mainly concentrated in the region where the flow velocity is less than 0.09 m/s. The height of the vortex area gradually decreases with the increase of the frother concentration, and the critical value of the minimum vortex area is 1.06 times the bubble diameter. There are three kinds of trajectories of particles in the bubble trailing vortex area, and the trajectory of particle coiling can be divided into three significant stages, and the force on the particles is the critical factor leading to the difference in their coiling types. The range and probability of particles being coiled gradually decreased with the increase of frother concentration. The critical concentration affecting both the bubble trailing vortex and particle motion was 1.6×10-4 mol/L. The results of the study clarified themechanism of frother concentration on mineral particle entrainment in the bubble trailing vortex and provided valuable guidance for the development of microfine mineral flotation technology.