| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Aluminum Reduction Technology
|
| Presentation Title |
Factors Affecting the Performance of Oxygen Evolving Ni-Fe-Cu Anodes in Low Temperature Molten Fluoride Electrolyte for Aluminium Electrowinning |
| Author(s) |
Gudrun A. Saevarsdottir, Geir Martin Haarberg, Kamaljeet Singh, Sai Krishna Padamata |
| On-Site Speaker (Planned) |
Gudrun A. Saevarsdottir |
| Abstract Scope |
There is a strong push towards developing an alternative low carbon process for the primary production of aluminium. Electrolysis with inert, oxygen evolving, anodes is an attractive alternative, and alloys of Ni-Fe-Cu are promising. This paper describes results from electrochemical studies to examine the performance of such anodes, for different sodium- potassium cryolite electrolyte composition from CR=(NaF+KF)/AlF3=1.3 to 1.4, and KR=KF/(KF+NaF)=0.3-0.4. Voltammetry curves reveal how surface treatment in the form of anode pre-oxidation of the reduces passivation current and improves anode stability. Also the affect of the polarisation history of the anode on the voltammetry characteristics and the overall long term stability of the anode is addressed, but leaving the anodes un-polarised in the electrolyte damages the dense, protective, oxide layer on the anode surface, although pre-oxidation offers some protection. |
| Proceedings Inclusion? |
Planned: Light Metals |
| Keywords |
Aluminum, Electrometallurgy, Sustainability |