Modeling the Behavior of Alumina Agglomerate in the Hall-Héroult Process

Dassylva-Raymond, Véronique; Kiss, László I.; Poncsák, Sándor; Chartrand, Patrice; Bilodeau, Jean‐François; Guérard, Sébastien

doi:10.1007/978-3-319-48144-9_102

Cited by 3 publications

(4 citation statements)

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“…Hydro Aluminium, Primary Metal Technology, Norway e-mail: Eirik.Manger@hydro.com tion and agglomerate dynamics. As pointed out by Dassylva-Raymond et al [1], the formation of agglomerates affects the overall dissolution (and distribution) of alumina as well as cell stability. Evidently, a deeper understanding of these phenomena is of interest for further development of Hall-Héroult process.…”

Section: Eirik Mangermentioning

confidence: 94%

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CFD Modelling of Alumina Feeding

Einarsrud

Gylver

Manger

2018

The Minerals, Metals &Amp; Materials Series

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The dissolution and distribution of alumina in molten cryolite bath is a complex process, involving heat and mass transfer, phase transition and dynamics for a particle population with variable size and properties. Although single particle models can describe essential features of the process, they necessarily fail to capture features involving the interaction between particles (i.e. collisions and adhesion) and detailed coupling to the flow field, for which computational fluid dynamics (CFD) is needed. Several strategies and assumptions have been proposed in the literature, focusing on separate phenomena of relevance. Coupled models considering the full history of alumina particles have however not yet been developed. In the current work we investigate and review recent developments in coupled CFD particulate flow, aiming for general guidelines for implementation and use, with applications to both the gas-solid flow between the feeder and bath surface, and from the bath surface to dissolved alumina.

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Section: Eirik Mangermentioning

confidence: 94%

“…As pointed out by Thonstad et al [3], apart from the sintering and lump formation, it is possible to use general theory to elucidate probable mechanisms and dissolution rates. This has been demonstrated by Dassylva-Raymond [1], essentially by adopting a single particle model to describe the evolution of a single agglomerate.…”

Section: Eirik Mangermentioning

confidence: 99%

CFD Modelling of Alumina Feeding

Einarsrud

Gylver

Manger

2018

The Minerals, Metals &Amp; Materials Series

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“…Dissolution and distribution of alumina is a complex process involving simultaneous transfer of heat and mass as well as phase dynamics. Despite considerable efforts over the last decades, [1]- [9], the origin and consequence of certain phenomena remains unclear, particularly in an industrial setting. As previously pointed out by several authors, cf.…”

Section: Introductionmentioning

confidence: 99%

“…As previously pointed out by several authors, cf. [1] and [2], the dissolution and distribution of alumina is crucial for stable operations, even more so as the available bath volume is decreasing due to increasing anode size and amperage, in order to increase the overall efficiency of the process.…”

Section: Introductionmentioning

confidence: 99%

Alumina Feeding and Raft Formation: Raft Collection and Process Parameters

et al. 2019

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Alumina, alongside with electricity and carbon, is the raw material used for production of aluminium in the Hall-Héroult process. An efficient dissolution process is important to acquire stable conditions for the cell, resulting in lower energy consumption. Under certain conditions, the alumina will not dissolve upon addition but remains afloat on the bath surface as a so called raft. The conditions under which the rafts form are still not fully understood, although it is likely that their behaviour is influenced by operational conditions which in turn depend upon bath and alumina properties. In order to obtain more knowledge on the conditions for raft formation, an industrial measurement campaign was performed at Alcoa Mosjøen in which raft behaviour was recorded alongside collection of bath and alumina samples as well as the rafts themselves. The current paper describes the procedure utilized for data collection together with an analysis of bath and alumina properties, aiming to correlate these with raft flotation times. Raft floating times were found to vary between 5 and 140 seconds during normal operating conditions.

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