Effect of ultrasound with changing anode-cathode distance (ACD) on cell voltage during aluminum electrolysis
CO2 gas generates on the bottom of the anode during aluminum electrolysis, which forms a bubble layer increasing the cell voltage about 0.20 V. This limits a possible decrease of the ACD that has to be kept about 4-5 cm in order to avoid a secondary reaction, thus causing an additional voltage drop. In this paper, the effects of ultrasound with changing ACD on the cell voltage were investigated. It was found that the bubble underneath the anode went through a life cycle of generation-growth-detachment, which made the cell voltage oscillation; with ul-trasound-on, the bubble was removed almost absolutely and the cell voltage dropped to a certain extent. The amplitude of the cell voltage oscillation was higher in correlation with the ACD increasing. At an appropriate current density, the bubble overvoltage could be dropped by ultrasound irradiated at any ACD, and the effect was more remarkable at a lower ACD. The positive impact of ultrasound with decreasing ACD on the cell voltage was obvious, which gave a reduction of the cell voltage about maximum 22.5％. This means that the combination of ultrasound and lowered ACD may reduce the cell voltage effectively with great potential for energy-saving.
aluminum electrolysis ultrasound anode-cathode distance cell voltage see-through cell
ZHU Jun XUE Jilai LI Xiaiig LI Jigang ZHENG Yifang
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Be School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Be
国际会议
The 3rd Asian Conference on Molten Salts and Ions Liquids 2011(第三届亚洲熔盐与离子液体会议)
哈尔滨
英文
109-112
2011-01-06（万方平台首次上网日期，不代表论文的发表时间）