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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Perfluorocarbon Generation and Emissions from Industrial Processes
Presentation Title PFC Evolution Characteristics during Aluminium and Rare Earth Electrolysis
Author(s) Ole S. Kjos, Asbjørn Solheim, Thor Anders Aarhaug, Karen Osen, Ana Maria Martinez, Camilla Sommerseth, Henrik Gudbrandsen, Anne Støre, Heiko Gaertner
On-Site Speaker (Planned) Ole S. Kjos
Abstract Scope In addition to aluminium electrolysis, the electrolysis of rare earth metals from fluoride melts is a significant source of perfluorocarbon (PFC) emissions to the atmosphere.  These processes have many similarities, they are both based on molten fluoride salt electrolysis at temperatures around 1000 °C, and are utilizing carbon materials as the anode.  Although PFC emissions from aluminium industry and rare earth electrolysis have the same overall reactions, they are often reported to have different characteristics.  In order to get a better understanding of these differences and similarities, different laboratory experiments focusing on anode reactions and gas compositions in Al<sub>2</sub>O<sub>3</sub> saturated cryolite and REF<sub>3</sub>-LiF melts during aluminium and rare earth metal electrolysis were studied. The results obtained, combined with thermodynamic data analysis allowed to better understand onset, evolution and termination behaviour of PFC evolution in molten fluoride systems of different chemistries.
Proceedings Inclusion? Planned: Light Metals


An Estimation of PFC Emission by Rare Earth Electrolysis
Attributing PFC Emissions to Different Industries: How Bottom-up Trends Can Complicate Top-down Analyses
Challenges in Estimating Global CF4 and C2F6 Emissions
Conditions and Mechanisms of Gas Emissions from Didymium Electrolysis and Its Process Control
Evaluation of Time Consistency when Quantifying Emissions of Perfluorocarbons Resulting from Low Voltage Anode Effects
Fluorinated Gas Production: Underestimated Source of PFCs?
Low Voltage PFC Measurements and Potential Alternative to Reduce Them at Alcoa Smelters
Methodologies to Measure Greenhouse Gas (GHG) Emissions from Industrial Processes and Determine the GHG Emission Factors
New Algorithm for Calculating CF4 Emissions from High Voltage Anode Effects
New Approach for Quantification of Perfluorocarbons Resulting from High Voltage Anode Effects
Perfluorocarbon Formation during Rare Earth Electrolysis
PFC Emission Reduction in the Semiconductor Industry
PFC Evolution Characteristics during Aluminium and Rare Earth Electrolysis
PFCs from the Chinese Aluminium Sector – Challenges in Emissions Accounting and Further Characteristics
Updated Factors for Calculating PFC Emissions from Primary Aluminum Production
Validation of Online Monitoring of PFC by QCL with FTIR Spectroscopy

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