摘要
铝电解过程中阳极底部产生气泡,气泡排放会引起电解槽的槽电压波动.本文采用透明槽进行铝电解实验,在阳极上施加恒定电流电解,电流密度为0.7 A/cm^2,观察气泡行为和气泡对槽电压影响,研究了水平阳极和阳极倾斜角为2°的条件下得到的气泡在阳极底部的形成长大过程,分析了气泡对槽电压的影响.结果表明:槽电压-时间曲线呈锯齿形状波动,每一个波动对应一个阳极气泡的形成周期.气泡刚逸出完时,槽电压最小,随着气泡的逐渐长大,槽电压逐渐增大,气泡将要逸出时达到最大.与水平阳极相比,阳极倾斜角为2°的条件下,气泡在阳极底面的停留时间变短了,电压-时间曲线也是呈锯齿形波动,气泡逸出的频率比水平阳极快,倾斜阳极气泡的周期平均为4 s,而水平阳极的气泡周期平均为9 s.
The cells voltage fluctuates with the generation and escape of anodic bubbles on the bottom surface of anode during aluminum electrolysis process.An aluminum electrolysis experiment was carried out in a transparent cell with a fixed current density of 0.7 A/cm 2.The bubble behaviors was observed and its corresponding cell voltage was measured simultaneously to investigate its relevance to bubble dynamics.The voltage fluctuation preformed a sawtooth pattern,in which anode bubbles formed and escpcsed periodically.The cell voltage was minimal when bubbles just left off anode surface,and it increased with the growth of bubble and reached its maximum value just before bubble escape.Compared to the horizontal anode,the cell voltage showed a similar pattern,but bubbles on the bottom of inclined anode released faster than that on horizontal anode.The average period of bubbles on inclined anode is around 4 s,while the average cycle of bubble on horizontal anode is around 9 s.
作者
李松
石忠宁
赵志彬
Li Song;Shi Zhongning;Zhao Zhibin(School of Chemical and Materials Engineering,Liupanshui Normal University,Liupanshui 553000,China;School of Metallurgy,Northeastern University,Shenyang 110819,China;Shenyang Aluminum and Magnesium Engineering and Research Institute,Shenyang 110001,China)
出处
《材料与冶金学报》
CAS
北大核心
2020年第1期35-38,共4页
Journal of Materials and Metallurgy
基金
贵州省教育厅自然科学项目(黔教合KY字[2017]273)
六盘水市重点实验室(52020-2018-03-04)
六盘水市重点实验室(52020-2019-05-09).
关键词
铝电解
阳极
槽电压
气泡
aluminum electrolysis
anode
cell voltage
gas bubble
