Bubble Characteristics and Its Influence Factors in Electroflotation with Aluminum Cathode
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摘要:
在自制的分极式电浮选柱式反应器中研究了铝电极作用下阴极浮选柱中气泡特征及其影响因素，以期为电浮选的应用提供理论基础和数据支撑。考察了溶液pH值、电压强度及电极反应时间对气泡尺寸和气泡浓度的影响，探索了气泡上浮速率与气泡尺寸的关系。结果表明，电浮选阴极可获得直径小于100 μm的氢气泡。溶液pH值、电压强度和电极反应时间对氢气泡尺寸和气泡浓度影响显著，且这种影响主要源于其对电极反应速率的影响。电极反应速率决定了气泡脱离电极板的时间以及单位时间的气泡生成量。电极反应速率越快，气泡的尺寸越小，浓度越高，上升速度越低。
Abstract:Bubble characteristics and its influence factors in electroflotation with aluminum were studied in a homemade electrode-separated electroflotation column, which is aiming to provide a theoretical foundation and data support for the utilization of electroflotation. The effects of solution pH, voltage strength and electrode reaction time on bubble size and concentration were investigated. The correlation of bubble rising velocity and bubble size was explored. The results indicated that the size of hydrogen bubbles from cathode was less than 100 μm. The impact of solution pH value, voltage strength and electrode reaction time was significant on bubble size and its concentration. The primary impact factor (i.e. electrode reaction rate) decided the time of a bubble breaking away from electrode plate and the bubble accumulation per unit time. The higher the electrode reaction rate was, the smaller the bubble size would be, resulting in higher concentrate and lower rising velocity.
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Key words:
- electroflotation /
- aluminum cathode /
- bubble /
- characteristic
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