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Meeting 2027 TMS Annual Meeting & Exhibition
Symposium Computational Thermodynamics and Kinetics
Presentation Title Optimization Design of a KCl–MgCl₂–CaF₂ Slag System for Aluminum Alloy Electroslag Refining Based on Thermodynamic Calculations
Author(s) Long Wan, Qun Yang, Ruilin Li, Dengfu Chen, Mujun Long, Huamei Duan
On-Site Speaker (Planned) Qun Yang
Abstract Scope The composition of the refining slag determines the purification efficiency and ingot quality in the electroslag remelting of aluminium alloys. To this end, with the aim of developing a high-performance refining slag, this study utilised thermodynamic software to calculate the isothermal phase diagrams and melting behaviour of the KCl–MgCl₂–CaF₂ slag system within the temperature range of 680–1000 °C, thereby optimising the composition ratios. The study found that the CaF₂ content plays a key role in regulating the melting behaviour of the slag system; further analysis indicated that when the CaF₂ content is controlled between 10% and 12.5%, and the KCl/MgCl₂ ratio is moderately reduced, both the melting point and density can be optimised simultaneously. Based on this principle, an optimised slag system combining a low melting point and low density was designed, providing a new formulation reference for the electroslag refining of aluminium alloys.
Proceedings Inclusion? Planned:
Keywords Aluminum,

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