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Green Alumina: A Technological Roadmap Read chapter Read first chapter

2022 | OriginalPaper | Chapter

A Water Model Study of Alumina Feeding and Dispersion

Authors : Sindre Engzelius Gylver, Simen Aase, Simen Bekkevoll, Sigmund Andres Kvammen Forberg, Kristian Etienne Einarsrud

Published in: Light Metals 2022

Publisher: Springer International Publishing

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Abstract

In the Hall-Héroult process, alumina is fed periodically into a cryolite bath, typically forming so-called rafts. While rafts have been observed and sampled in industry, the governing mechanisms for raft formation are not easily assessed in this setting. In this paper, we present a parametric study of alumina feeding and dispersion, where the liquid is kept close to its freezing point, to which cooled (soluble) particles are added. The effect of the temperature difference between particles and liquid, particle size distribution (PSD), and gas induced convection is considered and assessed. Results from the water model experiments show a strong impact of PSD on the raft floating time. High amounts of fines increased resulting in floating times between 240 and 550 s, compared to 35–135 seconds in the case of coarser particles. Increased temperature and convection contributed positively to dispersion, although less significantly than the PSD.

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previous chapter Empirical Prediction of Alumina Dissolution Rate in a Cryolitic Melt: Comparison with the Existing Literature
next chapter Modeling of the Heat Exchange, the Phase Change, and Dissolution of Alumina Injected in Electrolysis Cells
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Metadata
Title
A Water Model Study of Alumina Feeding and Dispersion
Authors
Sindre Engzelius Gylver
Simen Aase
Simen Bekkevoll
Sigmund Andres Kvammen Forberg
Kristian Etienne Einarsrud
Copyright Year
2022
Book
Light Metals 2022

Print ISBN: 978-3-030-92528-4

Electronic ISBN: 978-3-030-92529-1

Copyright Year: 2022

DOI
https://doi.org/10.1007/978-3-030-92529-1_49

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