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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Aluminum Reduction Technology
Presentation Title On Gaseous Emissions during Alumina Feeding
Author(s) Sindre Engzelius Gylver, Åste Hegglid Follo, Vegard Aulie, Espen Sandnes, Helene Marie Eng Granlund, Anders Sørhuus, Kristian Etienne Einarsrud
On-Site Speaker (Planned) Sindre Engzelius Gylver
Abstract Scope Aluminium electrolysis involves feeding of alumina into a cryolite based bath. Water originating from alumina as well from air reacts with fluorides and results in HF evolution. Untreated HF gas is a significant environmental and economical issue. HF is however effectively adsorbed in (primary) alumina before being fed back to the cell as secondary alumina, thereby recycling the fluoride. As alumina is fed to the cell, it forms a raft, delaying the dissolution process and linked to several operational challenges. The goal of the current work is twofold; first, water content is investigated in a lab scale setting, aiming to explain raft porosity, ultimately causing it to float rather than disperse in the bath. Secondly, the evolution of HF is investigated for different aluminas in both a lab scale setting and in industrial measurements performed at Alcoa Mosjøen, aiming to identify correlations between gas evolution and alumina properties.
Proceedings Inclusion? Planned: Light Metals


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Coupled SPH-DEM to Simulate the Injection of a Powder into a Liquid with Heat Transfer and Phase Change
Dissolution Characteristics and Concentration Measurements of Alumina in Cryolite Melts
Electrochemical Reduction and Dissolution of Aluminium in a Thin-layer Refinery Process
Experience with Lengthy Pot Hibernation at Alcoa Baie-Comeau
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Hydro’s New Karmøy Technology Pilot: Start-up and Early Operation
Improvement to Alpsys Instability and Alumina Feeding Control
Individual Anode Current Monitoring during Aluminum Reduction Cell Power Reduction
Influence of Additives on Alumina Dissolution in Superheated Cryolite Melts
Instant Monitoring of Aluminum Chemistry in Cells Using a Portable Liquid Metal Analyzer
Introductory Comments: Aluminum Reduction Technology
Latest Developments in GTC Design to Reduce Fluoride Emissions
Low and High Voltage PFC Slope Coefficient Monitoring during Pot Start-up
Mass Transport by Waves: Bath-metal Interface Deformation, Rafts Collision and Physical Model
Modeling Anode Current Pickup After Setting
New Phase in Upgrade of Søderberg Technology at RUSAL’s Smelters
On Gaseous Emissions during Alumina Feeding
On the Feasibility of Using Low-melting Bath to Accommodate Inert Anodes in Aluminium Electrolysis Cells
Process and Environmental Aspects of Applying Unshaped Carbon Materials for Cell Lining Purposes
Superconductor Busbars – High Benefits for Aluminium Plants

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