| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Aluminum Reduction Technology
|
| Presentation Title |
Improvement to Alpsys Instability and Alumina Feeding Control |
| Author(s) |
Anne Gosselin |
| On-Site Speaker (Planned) |
Anne Gosselin |
| Abstract Scope |
Several changes during our latest increases of cell productivity had a significant impact on cell resistance behavior and general cell performance. Lower anode cathode distance operation and/or anode size enlargement have led to a significant drop in bath volume. At the same time, more alumina must be dissolved in a context of higher current density. Alumina dissolution and dispersion through the cell became an issue and the level of instability has risen. Along with increasing instability, mucky cells became more frequent. Changes in control algorithms were needed to face this new reality and bring back cell performance to its former level or even improve it. Instability procedure have been modernized in order to discriminate high and low frequency instabilities. Alumina feeding procedure needed to be more robust against instability and be independent from instability procedure. Results from implementation at Alma plant are presented. |
| Proceedings Inclusion? |
Planned: Light Metals |