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Meeting 2024 TMS Annual Meeting & Exhibition
Symposium Aluminum Reduction Technology
Presentation Title MHD Stability of Aluminium Cells - Cathode Design Effects
Author(s) Valdis Bojarevics, Marc Dupuis
On-Site Speaker (Planned) Marc Dupuis
Abstract Scope An estimate of MHD stability is an important criterion when attempting to increase the aluminium reduction cell efficiency. The MHD stability is achieved by optimizing the magnetic field and the electric current distribution in the liquid metal. The magnetic field distribution is mostly determined by the external busbar network and the magnetized steel parts, while the electric current in the liquid metal is affected by the design elements of anode and cathode block+ collector bar construction details. Theoretical studies of MHD stability often rely on a simplified uniform current distribution over the cathode bottom. Modelling of commercial cells requires a detailed 3d representation of the cell cathode, coupled to the liquid metal. The software MHD-VALDIS permits to account for current distribution in the liquid metal and the coupled cathode including variable material properties, contact resistance, temperature dependent collector conductivity, carbon block length and ledge profile along cell perimeter. The software permits to compute the full electric current and magnetic field distribution change in time resulting in the velocities and metal/electrolyte interface wave development leading to damping or growth in an unstable cell. To quantify the instability the damping rate is determined using a new technique based on the consecutive wave peak heights comparison.
Proceedings Inclusion? Planned: Light Metals
Keywords Aluminum, Modeling and Simulation, Other

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Method for Anode Effect Prediction in Aluminum Electrolysis Cells Based on Multi-scale Time Series Modeling
A Method of Cell Heat Balance Control to Enable Variable Power Usage by Aluminium Smelters
A Review of Challenges and Solutions in Ledge Control and Measurement in Aluminium Electrolysis Cell
Accurate Measurement of Anode Current in Aluminum Electrolysis: From Ideal to Reality
Aluminium Carbide and Carbon Dust in Aluminium Electrolysis Cells. A Conceptual Model for Loss in Current Efficiency
Amperage Increase Program and Enablers in EGA Al Taweelah DX Technology Potlines
Application of SAMI Energy-saving and Current-intensifying Technology in a 330kA Potline
Cathode Inspection and Repair Procedure Improvements in ALBRAS
Cell Startup and Early Operational Improvements in ALBRAS
Combining New and Old Cathode Block Assembly to Increase the Lifetime of Pot at INALUM
Computational Simulation of Electromagnetic Fields in an Aluminum Electrolysis Cell
Construction and Application of Digital Twin in Aluminum Electrolysis
Correlation Between Corrosion Rate and Electrochemical Parameters of Anode Process on a Metallic Electrode in Molten Oxyfluorides
Cradle-to-Gate Carbon Footprint Assessment of Graphite Cathode for Aluminium Electrolysis Pots
Design and Trial of Electrical Collector Plate in Cathode Assemblies
Determination of the Air-gap Distribution at the Cast Iron to Carbon Cathode Interface Using a 3D Scanning Approach
Dimensional Analysis Applied to the Dissolution and Disintegration of Alumina Rafts: The Riddle of Dissolving Alumina Rafts Solved
Direct Production of Al-Mn Alloys during the Electrodeposition of Aluminium in a Laboratory Cell
Electrowinning of Al-Sc Master Alloys in the LiF-AlF3-Sc2O3 Melts
Estimation of the Spatial Alumina Concentration of an Aluminium Smelting Cell Using a Huber Function-based Kalman Filter
Factors Affecting the Performance of Oxygen Evolving Ni-Fe-Cu Anodes in Low Temperature Molten Fluoride Electrolyte for Aluminium Electrowinning
Fundamental Loss of Current Efficiency During Aluminium Electrolysis and its Correlation With Sodium Content Dissolved in the Aluminium
Influence of Low Temperature on the Surface and Morphological Properties of Hydrated Lime in SO2 Desulfurization Reaction
Limits for the Current Efficiency in Hall-Héroult Cells
Low Carbon Emission Technology Upgrading Industrial Pilot of 350kA Pots
Metal Tapping Yoke and Platform Modification for Improved Locking and Unlocking
MHD Stability of Aluminium Cells - Cathode Design Effects
Modeling and Design of the Cathode Block Assembly Using Different Types of Models
New 32h Tapping Cycle Implementation at ALBRAS
Novel Developments for Inert Anodes and Wettable Cathodes in Aluminium Electrolysis
Numerical Modeling of Anode Changes and Their Effect on Current Distribution and Magnetohydrodynamic Behavior of an Aluminium Cell
Online Monitoring of Metal Oxides in Molten Fluoride Electrolytes
Pot Failure Prediction at Emirates Global Aluminum (EGA)
Predicting Electrolyte and Liquidus Temperatures of Aluminium Smelting Cells for Power Modulation Using Dynamic Model
Preliminary Testing and Simulations of Pot Integrated Abart (PIA) at Alcoa Mosjøen
Re-usage of Big Butt
Regeneration of Aluminum Fluoride from Pure Bath
Restart of AP30 Cells at Boyne Smelters
SMARTCrane, a Fives' Digital Solution for Aluminium Production Optimization
Specific Energy Reduction Through Design Modifications at Aditya Aluminium Smelter
Study of the Degradation of Ordinary Refractory Bricks in an Aluminium Reduction Cell
Sustainability of Different Aluminium Production Technologies
Thermal Analysis of Operational Events Affecting Electrolysis Cells and Their Local Alumina Dissolution Conditions
Thermoelectrical Analysis of Lying-bed Patterns during Preheating Phase

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