On‐line Monitoring of Individual Anode Currents to Understand and Improve the Process Control at Alouette

Dion, Lukas; Lagacé, Charles-Luc; Victor, Ron; Kiss, László I.

doi:10.1002/9781119093435.ch122

Cited by 4 publications

(1 citation statement)

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“…However, due to the native characteristics of modern cells, it is very difficult to achieve a satisfactory and uniform alumina distribution at different locations. Rye et al [7] and Dion et al [8] measured the distribution of alumina concentration in aluminum reduction cells, and a clear gradient characteristic was presented in their works. According to Hydro research [9], a 1% alumina concentration difference could introduce a maximum of 8 mm deformation in the aluminum/bath interface.…”

Section: Introductionmentioning

confidence: 99%

CFD Investigation of Bath Flow and Its Related Alumina Transmission in Aluminum Reduction Cells: Slotted Anodes and Busbar Designs

Zhu

Zhang

2020

Metals

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Alumina is an indispensable raw material for the modern aluminum electrolysis industry. The distribution and transmission of alumina within the bath is of great significance to maintain stable operation and reduce energy consumption. In this study, a computational fluid dynamics (CFD) model was developed to investigate the bath flow and its related alumina transmission in aluminum reduction cells. The bath flow driven by bubbles, electromagnetic force, and aluminum flow presented two different sized vortices in the horizontal plane of the anode–cathode distance (ACD). Both numerical results and industrial data show that the average alumina concentration in the half-cell at the duct end is slightly larger than that of the tap end. With the application of slotted anodes, the maximum velocity of the bath flow increased and the average velocity decreased slightly in the horizontal plane, resulting in a more uniform distribution of alumina than that in the use of unslotted anodes. The symmetrical nature of the bath flow vortices became more obvious with the upgrade of the busbar design and the alumina concentration gradient became smaller within the bath.

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Section: Introductionmentioning

confidence: 99%