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中南大学学报(英文版)

Journal of Central South University

Vol. 25    No. 3    March 2018

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Bubble behavior in aluminum reduction cell with inert anode
ZHOU Yi-wen(周益文)1, 2, ZHOU Jie-min(周孑民)1, CHEN Shou-hui(陈首慧)2,LIU Zhi-ming(刘志明)2, BAO Sheng-zhong(包生重)2

1. School of Energy Science and Engineering, Central South University, Changsha 410083, China; 2. Zhengzhou Non-ferrous Metals Research Institute Co. Ltd. of CHALCO, Zhengzhou 450041, China

Abstract:The bubble behavior is one of the key factors for the design and the process of aluminum reduction cell using inert anode. A see-through cell is constructed to investigate the bubble flow behavior and the electrolyte flow pattern induced by bubbles. The test results show that the electrolyte is driven by the bubble to move around the cathode, and also some vortices occur in local areas. The bubble generated at the anode bottom undergoes the processes of formation, growth, sliding, detachment and coalescence. However, the bubble generated at the middle of anode detaches rapidly from the anode surface and moves upward and collides with other bubbles, which results in coalescence or break-up. Most bubbles are released into the atmosphere at the liquid surface, while some other bubbles taken by the electrolyte flush to the height higher than the mean horizontal level of the liquid and then drop down and move horizontally and they are released finally. Some bubbles are kept unbroken and are sliding on the electrolyte surface. The diameter of bubble generated at inert anode is smaller than that of bubble generated at graphite anode. Moreover, the bubbles on inert anode are spherical, which was different from those in tubular or disk form on graphite anode.

 

Key words: inert anode; bubble; diameter; releasing

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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