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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Primary Aluminum Industry - Energy and Emission Reductions: An LMD Symposium in Honor of Halvor Kvande
Presentation Title Vaporization of Fluorides from Aluminium Cells. Part I: Theoretical Study on Replacement of Aluminium Fluoride and Soda
Author(s) Asbjorn Solheim, Samuel Senanu
On-Site Speaker (Planned) Samuel Senanu
Abstract Scope Commercial alumina contains Na2O and CaO, which must be "neutralised" by regular additions of AlF3 to the bath in aluminium electrolysis cells. As a result, most smelters are net bath producers. The present paper suggests that part of the AlF3 can be replaced by the condensate formed by partial vacuum vaporization of tapped-off bath, thereby reducing the amounts of deposited bath. The condensate may have a composition close to the main evaporation product (NaAlF4), while the remaining bath will be rich in NaF and can be used for replacing soda. Data for vapour pressure and condensate composition are presented. A bath mass balance is derived in terms of Na2O and CaO in the alumina, comprising replacement of AlF3 with condensate from produced bath. Different process options are discussed, including repeated cycles of vaporization and condensation.
Proceedings Inclusion? Planned: Light Metals
Keywords Aluminum, Electrometallurgy,

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Historical Review of Aluminum Reduction Cell Start-up and Early Operation
Direct and indirect CO2 equivalent emissions from primary aluminium production
Environmental Enhancement of Potroom Processes by Using a Machine Vision System
Gas Recycling and Energy Recovery. Future Handling of Flue Gas from Aluminium Electrolysis Cells
Halvor Kvande: An Academic Ambassador in Aluminum Between China and Norway
Ready-to-Use Cathodes in high amperage technologies
Reflections on the Low Voltage Anode Effect in Aluminium Electrolysis Cells
Sampling and analysis methodology review to report total PFC emissions
SCALE FORMATION IN PRIMARY ALUMINIUM PRODUCTION
The Importance of Respecting the Underlying Science and Physics When Maximising Productivity and Return on Investment of Modern Aluminium Smelting Technology
The TMS Industrial Aluminum Electrolysis Course – History, Development of Contents, and Future
Vaporization of Fluorides from Aluminium Cells. Part II: Treatment of Spent Potlining in a Laboratory Furnace
Vaporization of Fluorides from Aluminium Cells. Part I: Theoretical Study on Replacement of Aluminium Fluoride and Soda

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