一种新型浮选柱发泡器生成气泡特性研究

Bubble Generation Characteristics of A new type of Flotation Column

在自行设计的浮选柱模拟系统中,对一种新型浮选柱微泡-逆流接触式浮选柱气泡发生器的发泡特性进行系统研究;以发泡器产生的气泡为研究对象,通过高速摄像记录仪获取气泡图像,采用图像处理软件对气泡直径及速度进行提取、统计,考察气泡发生器在不同充气条件下气泡密度及气泡尺寸分布特征,探索生成气泡的尺寸和速度之间的对应关系。研究结果表明,随充气量增大,气泡平均直径增大,气泡尺寸分布由变宽,微气泡数量减少;在充气量Q=4 L/min时,气泡尺寸分布比较均匀且产生充足的微气泡;气泡上升速度主要取决于充气量和气泡尺寸,通过试验数据分析,提出了该浮选柱气泡发生器生成气泡上升速度与尺寸之间的指数关系式。

In the self-designed flotation column simulation system,the foaming characteristics of the bubble generator of a new type of flotation column-microbubble countercurrent contact flotation column are systematically studied.The bubble generated by the bubble generator is taken as the research object,and the bubble image is obtained by the high speeds camera recorder.The image processing software is used to extract and count the bubble diameter and velocity.The bubble density and bubble size distribution characteristics of the bubble generator under different aeraton conditions are investigated,and the correspondence between the size and velocity of the bubble generation is explored.The results prove that,the average diameter of the bubble increases,the bubble size distribution can becomes wider,and the number of microbubbles can decreases with the increase of the aeration.When the aeration amount is Q=4 L/min,the bubble size distribution is uniform and sufficient microbubbles are generated.The rate of bubble rise depends mainly on the amount of gas and the size of the bubble.Based on the experimental data analysis,the exponential relationship between the rate of bubble rise and the size of the bubble generator generated by the flotation column is proposed.