Observation of Anodic Bubble Behaviors Using Laboratory Scale Transparent Aluminium Electrolysis Cells

Zhao, Zhibin; Wang, Zhaowen; Gao, Bingliang; Feng, Yuqing; Shi, Zhongning; Hu, Xianwei

doi:10.1002/9781119093435.ch135

Cited by 9 publications

(9 citation statements)

References 10 publications

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“…Figure 7 shows the fast process of coalescence of three bubbles into one bubble. The diameter of three bubbles was measured to be around 1.5 mm, frame (1). Frame (3) represents the intermediate stage in the coalescence process.…”

Section: Bubble Behavior On the Vertical Anodementioning

confidence: 99%

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Bubble Behavior on Horizontal and Vertical Carbon Anode Surfaces in Cryolite Melt Applying a See-Through Cell

Stanic

Sandnes

2021

The 1st International Electronic Conference on Metallurgy and Metals

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Gas bubble behavior on a carbon anode in a cryolite melt has been studied by visual observation using a see-through cell. The bubble phenomena studied have included growth, coalescence, and detachment during electrolysis. Two different anode designs were tested, an anode with a horizontal facing-downwards surface and an anode with a vertical surface. At the horizontal anode, it was found that one large bubble was formed by the growth and coalescence of smaller bubbles, and finally, the large bubble detached periodically. For the vertical anode surface, many smaller bubbles were formed and detached randomly. The bubble diameter was decreasing with increasing current density for both anodes.

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Section: Bubble Behavior On the Vertical Anodementioning

confidence: 99%

“…Gas present at the anode surface contributes to an increased cell voltage. The extra potential drop in an industrial cell due to the presence of bubbles is about 0.15-0.35 V out of a typical total cell potential of ~4.5 V [1]. To obtain faster gas bubble release, slotted anode designs were introduced.…”

Section: Introductionmentioning

confidence: 99%

Bubble Behavior on Horizontal and Vertical Carbon Anode Surfaces in Cryolite Melt Applying a See-Through Cell

Stanic

Sandnes

2021

The 1st International Electronic Conference on Metallurgy and Metals

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“…The difference between the bubbles produced by the inert anode and those produced by the graphite anode is analyzed. Wang et al − found that the use of a slotted anode accelerates the exhaust of the bubbles. As the current increases, the effect of slotting gradually decreases.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Application of a Perforated Anode in an Aluminum Electrolysis Cell on the Gas–Liquid Two-Phase Flow and Bubble Distribution Characteristics

Hou

Yuan

et al. 2020

Ind. Eng. Chem. Res.

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In contrast to the original form of the anode, the perforated anode is a new kind of anode that can significantly reduce the bubble thickness while maintaining a stable electrolysis process. The bubble movement was simulated within physical and mathematical models of the flow field in the anode–cathode distance (ACD) area, in which the electrolyte solidification zone in the anode perforations was treated creatively as a porous medium. The flow field distribution and the bubble layer thickness in the ACD area were simulated. The influence of the process parameters, such as the electrolyte temperature and ACD, on the flow field was analyzed. The results show that compared with the regular anode and slotted anode, the use of the perforated anode reduces the thickness of the bubble layer by approximately 1.63 and 1.06 mm, respectively. The velocity of the electrolyte is positively correlated with the electrolyte temperature, anode width, and bubble layer thickness. The immersion depth of the anode and the interanode gap have little effect on the bubble thickness and flow field.

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“…In decades, fundamental researches in understanding physical chemical phenomena existed in the cryolitic melt were carried out in Northeastern University, such as dissolution of metals in molten salts; dissolution of oxide in molten salts and anodic bubble behaviors during aluminum electrolysis. A special instrument, called high temperature transparent cell was used to investigate these phenomena [3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

The Alumina Dissolution in Industrial Aluminum Cells

Gao¹,

Feng²,

Wang³

et al. 2018

J. Sib. Fed. Univ. Eng. technol.

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The dissolution behaviors of primary and secondary alumina in aluminum bath were compared. The dissolution of primary alumina can be divided into a few key steps: fast dissolution upon feeding, crust formation and sludge dissolution. The dissolution rate of secondary alumina is much faster than that of primary alumina. Industrial measurements of alumina concentration in 410 kA and 500 kA cells confirmed the laboratory results.

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Observation of Anodic Bubble Behaviors Using Laboratory Scale Transparent Aluminium Electrolysis Cells

Cited by 9 publications

References 10 publications

Bubble Behavior on Horizontal and Vertical Carbon Anode Surfaces in Cryolite Melt Applying a See-Through Cell

Bubble Behavior on Horizontal and Vertical Carbon Anode Surfaces in Cryolite Melt Applying a See-Through Cell

Effects of the Application of a Perforated Anode in an Aluminum Electrolysis Cell on the Gas–Liquid Two-Phase Flow and Bubble Distribution Characteristics

The Alumina Dissolution in Industrial Aluminum Cells

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