|About this Abstract
|2022 TMS Annual Meeting & Exhibition
|Late News Poster Session
|F-34: A Study on the Role of Crystal Shape on the Freeze-lining Growth and Stability
|GaŽlle Butin, Lennart Scheunis, Bart Blanpain, Annelies Malfliet
|On-Site Speaker (Planned)
Freeze-linings are used in high-temperature metallurgical processes to protect the walls from the aggressivity of the molten slags. They are composed of amorphous and/or crystalline phases, whose composition and assemblage depend on the process characteristics, such as the slag primary phase field and the applied cooling rate. In this study, we investigated the role of olivine, spinel and melilite properties on the stability of freeze-linings formed in the Fe-Al-Ca-Si-O slag system. Data were collected from literature, from the software FactSage, and from freeze-lining experiments done with a gas-cooled probe and a vertical tube furnace. By analyzing the microstructure and chemical composition of the samples with SEM, EPMA and XRD, we determined the impact of the type of crystal on the freeze-lining structure and on the properties of the boundary layer at the freeze-lining and slag interface, and therefore on the overall freeze-lining interactions with the molten bath.
|Pyrometallurgy, Solidification, Characterization