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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Aluminum Reduction Technology
Presentation Title Stabilizing a Low-dimensional Model of Magnetohydrodynamic Instabilities in Aluminum Electrolysis Cells
Author(s) Ibrahim Mohammad, Douglas H. Kelley
On-Site Speaker (Planned) Ibrahim Mohammad
Abstract Scope Aluminium (Al) is produced in electrolysis cells that contain two molten, broad and shallow layers, Al beneath cryolite (bath). A magnetohydrodynamic (MHD) instability known as the metal pad instability (MPI) has been a barrier for reducing anode-to-cathode (ACD) distance and thus decreasing electric losses. The MPI arises from the electromagnetic forces amplifying gravity waves with similar frequencies present at the Al-bath interface. Davidson and Lindsay suggested a mechanical model of the MPI in the form of a compound pendulum with a steady electric current running through it that, in the presence of a vertical magnetic field, couples the pendulum's motion in the two directions. We expand this model to test whether adding an oscillating (AC) current can stabilize the pendulum's motion and consequently have the potential to stabilize Al electrolysis cells. We show that AC current can indeed stabilize the motion, and that stability depends in a complicated way on AC amplitude and frequency.
Proceedings Inclusion? Planned: Light Metals
Keywords Aluminum, Modeling and Simulation, Sustainability


A Pragmatic Model for Alumina Feeding
A Water Model Study of Alumina Feeding and Dispersion
Advanced Alumina Dissolution Modelling
An Attempt to Estimate the Sulfuric Acid Dewpoint in the Flue Gas from Aluminium Electrolysis Cells
Bauxite & Alumina: Now and In the Future
Concentration Distribution of Carbon Particles in Aluminium Electrolysis Cells
Developing and Implementing an Efficient Forced Cooling Network at Aluminerie Alouette
Direct Production of Aluminum Manganese and Silicon Alloys in Aluminum Reduction Cells, A Laboratory Test
Direct Production of Aluminum Titanium Alloys in Aluminum Reduction Cells, A Laboratory Test
Empirical Prediction of Alumina Dissolution Rate in a Cryolitic Melt: Comparison with the Existing Literature
Imaging Alumina Distribution Using Low-voltage Anode Effect Detections in Anodic Current
Managing Power Interruptions at 360 KA Smelter
Mass Transport by Waves: Physical Model with Coalescence, Fragmentation, and Displacement on a Bath-metal Interface
Modeling of the Heat Exchange, the Phase Change, and Dissolution of Alumina Injected in Electrolysis Cells
Oxide Sensor Measurements and Simultaneous Optical Observations during Dissolution of Alumina in Cryolite Melt
Preparation of Aluminum Master Alloys by Electrolytic Co-deposition in Hall-Héroult Cells
Restart of Copper-insert Pots in EGA's High Amperage Potlines
Stabilizing a Low-dimensional Model of Magnetohydrodynamic Instabilities in Aluminum Electrolysis Cells
Statistical Model for Forecasting the Cell Replacement Rate in an Aluminum Smelter
Strategic Training and Development of Smelter Teams to Improve Business Outcomes
The Survivability of Aluminum Potlines after Lengthy Electrical Power Outages
Trace Elements in Aluminium Smelting Carbon Dust and Their Extraction

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