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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Electrode Technology for Aluminum Production
Presentation Title Purification of Graphite by Thermal Vacuum Treatment of Spent Potlining
Author(s) Kristin Sundby, Ulf Sjöström, Ellen Myrvold, Morten Isaksen
On-Site Speaker (Planned) Kristin Sundby
Abstract Scope The aluminium industry is striving towards a lower environmental footprint, and the management of spent potlining (SPL) is high on the agenda. The reuse and recycling alternatives of SPL are limited primarily due to its content of sodium, fluorides and cyanide. In this work, a thermal vacuum process for the purification of first cut SPL has been tested. The process consists of a vacuum furnace and an off-gas condensation system. Small scale trials using 1000 gram first cut SPL samples were carried out, with varying particle sizes and furnace temperatures. All tests demonstrated significant distillation of sodium fluoride and cryolite. The remaining residues contained up to 91 % graphite, with minor amounts of contaminants such as aluminium oxide and calcium fluoride. Conclusively, the vacuum treatment process shows great potential for reuse of the challenging material of first cut SPL.
Proceedings Inclusion? Planned: Light Metals


10 Years of Anode Research and Development: Alcoa & Université Laval Experience
Additive Selection for Coal Tar Pitch Modification in Aluminum Industry
An EXAFS and XANES Study of V, Ni, and Fe Speciation in Cokes for Anodes Used in Aluminum Production
Anhydrous Carbon Pellets – An Engineered CPC Raw Material
Carbon Anode Raw Materials – Where is the Cutting Edge?
Charcoal and Use of Green Binder for Use in Carbon Anodes in the Aluminium Industry
Development of a Soft Sensor for Detecting Overpitched Green Anodes
Diffusion Measurements of CO2 within Carbon Anodes for Aluminium Smelting
Energy Saving in Hall-Héroult Cell by Optimization of Anode Assembly Design
Environmental Benefits of Using Spent Pot Lining (SPL) in Cement Production
Higher Baking and Production Levels in Anode Baking Furnaces and Associated Challenges
How to Improve the Environmental Efficiency of the Hall-Heroult Process While Producing and Using Carbon Anodes?
Influence of Particle Shape and Porosity on the Bulk Density of Anode Grade Petroleum Coke
Major Reconstruction of Central Casing of Open Top Baking Furnace with a View to Increase Its Lifespan and Reduce the Total Costs Comparing to Full Reconstruction
Modelling of Gas Injection on Anode Baking Furnace and Application to Operations
Purification of Graphite by Thermal Vacuum Treatment of Spent Potlining
Ready-to-Use Cathodes for the Hall-Héroult Process
Redesigning of Current Carrying Conductor - The Energy Reduction Initiative in Low Amperage Hall-Héroult Cell
Solids Flow Considerations and their Impact in Smelter Carbon Plant Operations and Product Quality
Sustainable Spent Pot Lining Management Guidance
Testing of SERMA Technology on Industrial Anodes for Quality Control in Aluminum Production
The Development of Anode Shape, Size and Assembly Designs - Past Present and Future Needs
The LCL&L Process: A Sustainable Solution for the Treatment and Recycling of Spent Potlining
Trends in Carbon Anode Production

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