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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Perfluorocarbon Generation and Emissions from Industrial Processes
Presentation Title Perfluorocarbon Formation during Rare Earth Electrolysis
Author(s) Karen Sende Osen, Ana Maria Martinez, Henrik Gudbrandsen, Anne Store, Ole Kjos, Camilla Sommerseth, Heiko Gaertner, Thor Anders Aarhaug, Pierre Chamelot, Mathieu Gibilaro, Laurent Massot
On-Site Speaker (Planned) Karen Sende Osen
Abstract Scope A challenge during rare earth (RE) electrolysis is to avoid emissions of perfluorocarbon (PFC) green-house gases. The objective of this work was to study how to operate the RE electrolysis process with neither PFC formation nor anode effect. Linear Sweep Voltammetry was carried out at 1050 and 1100 C, and electrolysis was performed in REF3-LiF melts at ca. 1050 C during on-line off-gas analysis. To avoid anode effect, the current density values must be strictly less than 0.43 and 0.68 A cm-2 at working temperatures of 1050 and 1100 C. The optimal REO batch feed rate for avoiding PFC formation could be established by correlating the onset of PFC with the values and the changes that occurred in the anode potential.
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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