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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Perfluorocarbon Generation and Emissions from Industrial Processes
Presentation Title Conditions and Mechanisms of Gas Emissions from Didymium Electrolysis and its Process Control
Author(s) Ksenija Milicevic, Dominic Feldhaus, Bernd Friedrich
On-Site Speaker (Planned) Ksenija Milicevic
Abstract Scope During molten salt electrolysis of rare earths greenhouse gas emission occurs causing environmental and climate changes. In this study the electrochemical process window for didymium oxy-fluoride electrolysis is determined by linear sweep voltammetry and staircase chronoamperometry. Simultaneously the composition and the quantity of gas generation are investigated by an in-situ FTIR-spectrometry in order to understand the process phenomena happening at anode and the mechanisms behind. Different electrolyte compositions based on NdF3, PrF3 and LiF and various oxide amounts were employed showing the diversity in off-gas ratios. Effects of using two praseodymium-oxide compounds, namely Pr6O11 and Pr2O3 used as raw materials, on the process and amount of anodic gasses is considered as well. Perfluorocarbon (PFC) emission reduction is accomplished by electrolysis automatization coupling the FTIR-spectrometer with a controller which triggers the oxide dosage preventing full anode effect.
Proceedings Inclusion? Planned: Light Metals

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

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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