| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Aluminum Reduction Technology
|
| Presentation Title |
Online Monitoring of Metal Oxides in Molten Fluoride Electrolytes |
| Author(s) |
Wojciech Gebarowski, Samuel Senanu, Arne Petter Ratvik, Ole Kjos, Henrik Gudbrandsen, Egil Skybakmoen |
| On-Site Speaker (Planned) |
Samuel Senanu |
| Abstract Scope |
Reliable monitoring of oxide concentrations in electrowinning of metals in fluoride-based electrolytes is very important for avoiding unwanted reactions, notably perfluorocarbons emissions which are very potent greenhouse gases. A probe, consisting of a working electrode and a counter electrode, has been developed for online monitoring of metal oxide concentrations in molten fluoride electrolytes. During measurements, the immersed probe in the electrolyte is subject to fast anodic polarisation sweeps while electric current response is recorded. During anodic polarisation, oxide species in the electrolyte are rapidly depleted at the probe, resulting in a response called anode effect on the probe tip, triggering a rapid voltage increase and current drop. The rate of oxide depletion and the consequent anode effect is proportional to the dissolved oxide concentration. This allows to correlate voltage-current-time curves to the oxide concentration. Measurements in cryolite melts with different oxide concentrations showed different voltages at which anode effect occurs. |
| Proceedings Inclusion? |
Planned: Light Metals |
| Keywords |
Aluminum, Electrometallurgy, Environmental Effects |