煤泥浮选气浮气泡尺寸分布规律及其影响因素研究

Title

Study on particle size distribution law of air flotation bubble and its influencing factors in coal slime flotation
作者

孙小朋刘文礼王文森陈塞刘伟
Author

SUN Xiaopeng,LIU Wenli,WANG Wensen,CHEN Sai,LIU Wei
单位

中国矿业大学（北京）化学与环境工程学院
Organization

School of Chemical &Environment Engineering,China University of Mining &Technology(Beijing),Beijing ,China
摘要

为了强化加压溶气气浮法浮选效果，研究了加压溶气气浮法中气泡尺寸的分布，通过实验室自制的基于图像法的气浮气泡尺寸测量装置，对气浮气泡尺寸进行了测量，对比了Nukiyana-Tanasawa分布、对数正态分布和正态分布在不同溶气压强及仲辛醇浓度下对气泡尺寸分布的拟合效果，并研究了溶气压强和起泡剂浓度对气浮气泡尺寸分布的影响。结果表明：加压溶气气浮法所产生的气泡尺寸分布符合正态分布规律；溶气压强对气浮气泡尺寸影响较大，随着溶气压强的增大，气浮气泡的Sauter直径逐渐减小，气泡尺寸分布密集峰逐渐向小尺寸方向转移；随着仲辛醇浓度的增加，气泡尺寸的分布更加集中，分布范围减小，Sauter直径也逐渐减小。
Abstract

In order to enhance the flotation effect of pressurized dissolved air flotation,the distribution of bubble size in this process was studied.The size of air bubbles was measured by the laboratory-made image-based air flotation bubble size measuring device.The fitting effects of Nukiyana-Tanasawa distribution,logarithmic normal distribution and normal distribution to the distribution of bubble size on different pressure and octanol alcohol concentrations were compared.The effects of dissolved gas pressure and foaming agent concentration on the size distribution of air-flotation bubbles were investigated.The results show that the bubble size distribution in the pressurized dissolved air flotation accords with the normal distribution law.The pressure of dissolution has a great influence on the bubble size,and with the increase of the pressure of dissolved gas,the Sauter diameter of the air bubble decreases gradually,the bubble size distribution density peak gradually shifts to the small size direction.With the increase of the concentration of octanol alcohol,the distribution of the bubble size is more concentrated,the distribution range is reduced,and the Sauter diameter is gradually reduced.
关键词

溶气浮选气泡尺寸溶气压强起泡剂正态分布
KeyWords

dissolved air floatation;bubble size;dissolved-air pressure;foaming agent；normal distribution
图表
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