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Electromagnetic filtration is a new method for the removal of micro-sized non-metallic inclusions from molten aluminum by means of an external electromagnetic field. This paper introduces a multistage electromagnetic filtration system using alternating magnetic field and its application in semi-continuous casting of aluminum billets. The inclusion content was quantitatively determined through PoDFA sampling and analysis. Results showed that the average efficiency of the removal of inclusion particles and oxide films could reach 93.8% and 80.9%, respectively. The content of inclusion particles without grain refiner could be decreased to a level of 0.02 mm 2 /kg aluminum, satisfying the requirements in terms of the cleanliness of high-quality aluminum products.

Online Electromagnetic Filtration of Molten Aluminum Using a Multistage Separator System