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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Perfluorocarbon Generation and Emissions from Industrial Processes
Presentation Title Low Voltage PFC Measurements and Potential Alternative to Reduce Them at Alcoa Smelters
Author(s) Eliezer Batista, Luis H Espinoza-Nava, Chris Tulga, Richard Marcotte, Yan Duchemin, Steven Starr, Petre Manolescu
On-Site Speaker (Planned) Luis H Espinoza-Nava
Abstract Scope Perfluorocarbon (PFC) gases evolve from aluminum electrolysis pots almost continuously. They are not only emitted during anode effects (above 8 volts) but also during pot instability periods where pot voltage is below 8 volts. The so called "low voltage anode effects" can be emitted during anode changes, pot feeding underfeed cycles or pot tapping periods that will increase the total smelter emissions. Molecular Spectroscopy techniques are used to measure low ppb LVPFC but equipment selection, measurements parameters and QA/QC controls should be reinforced to comply with possible regulation change to measure total emissions. Recommendations will be presented to warranty accuracy and reliability of measurements. In addition, results from feeding optimizations will be shown from three smelters with reduction of LVPFC.
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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