| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Primary Aluminum Industry - Energy and Emission Reductions: An LMD Symposium in Honor of Halvor Kvande
|
| Presentation Title |
Vaporization of Fluorides from Aluminium Cells. Part II: Treatment of Spent Potlining in a Laboratory Furnace |
| Author(s) |
Camilla Sommerseth, Samuel Senanu, Henrik Gudbrandsen, Stein Rørvik, Per Anders Eidem, Asbjørn Solheim, Morten Isaksen, Ellen Myrvold |
| On-Site Speaker (Planned) |
Camilla Sommerseth |
| Abstract Scope |
Today, spent potlining (SPL) from the aluminium industry is mainly placed on landfill. In a circular economy perspective, and with limited availability for landfill sites in the future, the industry is looking into ways of cleaning the SPL to produce saleable products. Vacuum vaporization was investigated to determine its applicability for removing fluorides from the graphite rich first cut SPL. It was demonstrated that vacuum vaporization at elevated temperatures is suitable for removal of fluorides. The condensate generally contained only cryolite and NaF, in accordance with theory. At the temperatures used it was impossible remove CaF2 or alumina from the SPL, due to the low vapour pressure. Hold time at elevated temperature and vacuum affected the amount of electrolyte removed. The findings comply with the theory for vaporization of fluoride mixtures. |
| Proceedings Inclusion? |
Planned: Light Metals |
| Keywords |
Aluminum, Recycling and Secondary Recovery, |