铝电解阳极碳块析出气体引起的电解质/铝液界面波动

电解质/铝液界面波动对电解铝过程的稳定性和电流效率有重要影响,基于计算流体动力学(CFD)方法建立铝电解槽内电解质/铝液/析出气体的多相流体流动的数学模型,研究铝电解槽内阳极碳块析出气体引起电解质/铝液界面波动现象,并对比分析传统型、长凸台型和小方体型阴极对电解质/铝液界面波动的影响.结果表明,电解质/铝液界面波动的形成时间约为45 s,之后波动进入稳定期,波幅变化很小.三种形式的铝电解槽中铝液波动的趋势基本一致,其中,传统型铝电解槽内液面波动幅度最大,长凸台型铝电解槽内的铝液波动幅度最小.

Study on Fluctuation of Interface in Aluminum Cell Caused by Gas Exudation from Anode Carbon Blocks

Interfacial fluctuation between electrolyte and aluminum plays an important role in stability and current efficiency of electrolytic aluminum process.A mathematical model of electrolyte/aluminum/gas multiphase flow in aluminum cells based on a computational fluid dynamics(CFD) method was built to study the interfacial fluctuation between electrolyte and aluminum caused by gas exudation.Furthermore,the effects of three different aluminum electrolysis cells were analyzed,including traditional,cuboid cathode and small cube cathode cell.The results showed that it takes 45 s for the fluctuation to reach a steady situation.After that,the changing of amplitude is very small.The interfacial fluctuations in three different aluminum electrolysis cells have same trend,and the wave amplitude in cuboid cathode aluminum cell is smaller than that in the others.