Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第14卷    第2期    总第59期    2004年2月

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文章编号:1004-0609(2004)02-0298-04
铝电解金属阳极上的气泡析出行为
徐君莉, 石忠宁,高炳亮, 邱竹贤

(东北大学 材料与冶金学院, 沈阳 110004)

摘 要: 利用双室透明石英电解槽研究了铝电解金属阳极上气泡的析出行为。实验发现, 在低电流密度下, 电解开始的一段时间内, 新生的氧用于氧化金属阳极表面以形成氧化物膜, 此时阳极室没有氧气析出, 而阴极室有铝雾扩散; 当形成足够厚的氧化膜后,阳极的氧化速度减慢, 阳极表面才析出氧气。 在高电流密度下, 由于单位时间内在阳极上产生的氧量高于用于氧化金属阳极表面所需的氧量, 电解一开始阳极上就有氧气析出。对低电流密度下气泡的生长过程观察发现, 气泡先在阳极表面长大, 再汇聚成一个或几个大气泡从阳极底部析出, 析出前的气泡平均直径随电流密度的增加而减小。 

 

关键字: 金属阳极; 气泡; 电流密度; 透明电解槽

Bubble behavior on metal anode of aluminum electrolysis
XU Jun-li, SHI Zhong-ning, GAO Bing-liang, QIU Zhu-xian

School of Materials & Metallurgy, Northeastern University, Shenyang 110004, China

Abstract: The behaviour of bubble evolved from metal anode was researched during aluminum electrolysis in a two-compartment see-through quartz cell. Within some time of the beginning of electrolysis, it is discovered that there are no oxygen bubbles produced in the anodic room at lower current density, while aluminum fog disperses in the cathodic room. All renascent oxygen is consumed for oxidizing metal anode to form metal oxide film. When the oxide film is thick enough, the oxidation velocity of metal anode becomes lower, then oxygen bubbles release from the anodic surface. At higher current density, since the produced oxygen is more than that consumed, oxygen is released. Bubbles released at low current density grow, coalesce to a big one and then set free at the anodic surface. The diameter of released bubble decreases with the increasing of current density.

 

Key words: metal anode; bubble; current density; see-through electrolysis cell

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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