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Vogt, Helmut

doi:10.1023/a:1003575232103

Cited by 23 publications

(23 citation statements)

References 15 publications

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“…Consistent with the ionic nature of molten salts, if they dissolve in the molten bead, they could provide an interacting carbonate anion, CO 3 2-. However, the carbonates can also decompose to varying extents in the melt because of their limited stability as is illustrated by the following reactions…”

Section: Discussionmentioning

confidence: 99%

“…Vogt [3] attributed the disagreement between literature results (especially as observed for larger alumina contents) to the action of exposure time and electrode material on wettability, which can vary greatly between investigations. Parameters such as micro-roughness, surface polishness, carbon quality, graphite ash content and so on, can greatly affect the wetting properties at the interface graphite/ cryolite.…”

Section: Wetting Properties Of Pure Graphite/cryolitic Melts Interfacementioning

confidence: 99%

“…2-8 above are all expected to produce CO 2 (g), but no gas evolution was usually observed inside the droplet. It is therefore, thought that the dissolution of carbonate salt in the cryolite will bring CO 3 2-ions to the interface. CO 2 (g) evolution can then occur with a nucleation and bubble growth process but if no nucleation site is favourable, no gas evolution will occur.…”

Section: Dissolution Of Carbonate Salt Into the Bath-presence Of Co 3mentioning

confidence: 99%

“…CO 2 (g) evolution can then occur with a nucleation and bubble growth process but if no nucleation site is favourable, no gas evolution will occur. One possibility is that these CO 3 2-ions act as surface-active species. The more carbonate ions in the bath, the better the wettability.…”

Section: Dissolution Of Carbonate Salt Into the Bath-presence Of Co 3mentioning

confidence: 99%

“…Many researchers have viewed the anode/low alumina containing electrolyte interface poor wetting properties as directly responsible for the onset of the anode effect [1][2][3]. As a consequence, gas bubble detachment from the anode becomes more difficult as the alumina content decreases in the bath.…”

Section: Introductionmentioning

confidence: 99%

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Effect of dopants on wetting properties and electrochemical behaviour of graphite anodes in molten Al2O3-cryolite melts

et al. 2008

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The effects of anode dopants and alumina bath content on the wetting properties of the anode/bath interface in an aluminium electrolysis cell have been investigated in this study. Increasing the wettability of the carbon anode maximises the anode surface area and prevents a sudden increase in current density that polarises the anode leading to the discharge of fluoride ions and the onset of anode effect. From the contact angle measurements presented in this study, it is clear that the presence of carbonate salts inside and at the surface of the substrate greatly increases the wettability of the graphite substrate/ cryolitic melt interface. The higher the carbonate salt content of the substrate, up to a dopant levels of 6 wt%, the better the wetting properties. Furthermore, alumina appears to act as a surface-active component when present in the electrolyte in contact with a pure graphite anode, but these properties diminish when carbonate is present in the anode.

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Section: Discussionmentioning

confidence: 99%

Section: Wetting Properties Of Pure Graphite/cryolitic Melts Interfacementioning

confidence: 99%

Section: Dissolution Of Carbonate Salt Into the Bath-presence Of Co 3mentioning

confidence: 99%

Section: Dissolution Of Carbonate Salt Into the Bath-presence Of Co 3mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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