|About this Abstract
|2022 TMS Annual Meeting & Exhibition
|Cast Shop Technology
|Chlorine Free Degas System for Aluminum Slab Casting and Its Effect on Sheet Products
|Sandrella Samaha, Tao Wang, Patrice Robichaud, Pascal Gauthier, Josee Colbert, Ginny Hammersmith, Peter Evans
|On-Site Speaker (Planned)
The chlorine in-line degasser technology is one of the metal treatment methods utilized in aluminum industry to produce high quality products. However, the chlorine gas used in the system increased the environmental, health and safety (EHS) risks. At Rio Tinto, the chlorine-free salt ACD (Aluminum Compact Degasser) has been implemented to not only mitigate the EHS risks but also improve the product quality.
The salt ACD demonstrates better or equivalent metal treatment performance in terms of metal cleanliness, alkali and hydrogen removal compared to the chlorine degasser. The 5xxx and 6xxx alloy products were cast using both degassing systems and subsequently rolled and heat treated for their end uses. In this paper, the metallurgical properties, such as microstructure, strength and ductility, and inclusion populations, were compared between the products produced with regular and salt degassers. The chlorine-free salt ACD meets all the requirements regarding downstream processing and final product attributes.
|Planned: Light Metals
|Aluminum, Environmental Effects, Process Technology