电浮选过程中气泡行为的研究

Bubble behavior of electro-flotation

为了更好地研究气泡对浮选效果的影响,基于电浮选过程中气泡的特点和特性方程,分析电浮选过程中影响气泡直径的主要因素并确定粒子与气泡的碰撞概率。研究结果表明:在酸性介质中,电极材料对氢气泡直径有明显的影响,中性介质和碱性介质中电极材料对氢气泡直径的影响较小,但介质pH对氧气泡和氢气泡直径均产生较大影响;电极直径和电流密度在所研究的范围内对氢气泡直径和氧气泡直径的影响不大,只是部分气泡直径的分散性变得更加明显;随着温度的增加,最大气泡量所对应的氢气泡直径明显增大,但氢气泡的直径分布范围并未发生太大的改变;随着电流密度的增加,气泡的直径减小,当电流密度达到某一数值时,粒子与气泡碰撞概率达到最大。

In order to study preferably the effects of the bubble on electro-flotation,the features and characteristic equation of the bubble were discussed.At the same time,the key factors of the bubble on electro-flotation were researched deeply and the collision probability between the particle and the bubble was also established.The results show that there is an obvious influence of the electrode material on the hydrogen bubble diameters in the acidic medium,but the effects are unconspicuous in the neutral and alkaline medium.pH of the medium has greater impacts on the diameters of the hydrogen bubble and oxygen bubble.The effects of electrode diameters and current densities have less influences on the bubble diameters,but the dispersivity of parts diameters of the bubble becomes stronger.The diameters of the hydrogen bubble for the maximal bubble contents increase with the increase of the temperature,but the distribution range of diameters has no obvious changes.The diameters of the bubble decrease with the increase of current density,and the collision probability between the particle and the bubble can get the maximum as the current density attains a certain number.