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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Perfluorocarbon Generation and Emissions from Industrial Processes
Presentation Title PFCs from the Chinese Aluminium Sector – Challenges in Emissions Accounting and Further Characteristics
Author(s) David Sydney Wong, Xiping Chen, Bofeng Cai, Xin Bo, Pernelle Nunez
On-Site Speaker (Planned) David Sydney Wong
Abstract Scope PFCs from high voltage anode effects (HV-AE ≥8V) in aluminium smelters are currently accounted for by 2006 IPCC methodologies. Industry accounting of global PFCs is done by the IAI via anode effect (AE) surveys, however reporting from Chinese facilities remains limited, contributing to a 55% non-participation rate in 2015. A Chinese AE survey was conducted to help provide further data. However responses (supported by data from a case study smelter) highlighted that AE frequency (AEF) and duration (AED) statistics in China often do not include all detected AEs (only longer duration AEs e.g. ≥60s) which is inconsistent with IPCC Tier 2 PFC accounting methodologies. The paper also presents PFC measurement data (2011-12) from 10 potlines in China, showing that unaccounted emissions from low voltage anode effects (LV-AE <8V) can also be significant for low-amperage (235-240 kA) cells and that total PFC emissions were negatively correlated with current efficiency.
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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