| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Recycling and Sustainability in Cast Shop Technology: Joint Session with REWAS 2022
|
| Presentation Title |
Innovative Utilization of Aluminum-based Secondary Materials for Production of Metallurgical Silicon and Alumina-rich Slag |
| Author(s) |
Harald Philipson, Gjermund L. Solbakk, Maria Wallin, Kristian Etienne Einarsrud, Gabriella Tranell |
| On-Site Speaker (Planned) |
Harald Philipson |
| Abstract Scope |
The SisAl process encompasses the production of metallurgical silicon (Si) by reducing silica-based secondary raw materials aluminothermically. Along with the Si-alloy, a CaO-Al2O3-(low)SiO2 slag is produced, an appealing product particularly for the alumina industry. The research aims to explain key aspects of aluminothermic reduction to facilitate upscaling and combining optimal Si- and Al2O3-yield.
Three size fractions of aluminum (Al) dross were reacted with pre-fused CaO-SiO2 slag or Si-refining sculls at 1650 °C or above in two induction furnaces with different size and atmosphere. Supported by thermodynamic calculations, CaO/SiO2 ratio and reductant to silica-based slag ratio were varied and related to Si-yield and slag quality.
The results show that the Si-alloy is rapidly produced, and the Si-yield depend on the separation ability of alloy and slag. Al-dross and Si-refining sculls were found to be suitable for the SisAl process, enabling a circular economy perspective on these secondary streams. |
| Proceedings Inclusion? |
Planned: Light Metals |
| Keywords |
Recycling and Secondary Recovery, Process Technology, Other |