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Al 4 C 3  particles form during the primary production of aluminum  via  molten salt electrolysis due to the carbon solubility and direct contact between bath, metal, and carbon anodes. Additional Al 4 C 3  may form during melt processing through direct contact between the melt and carbonaceous materials. As a result of their small size and similar density to aluminum, removal of aluminum carbide particles can be challenging. If not removed, carbides can produce inclusion defects or poor surface condition in aluminum products. The current work studies the removal and behavior of Al 4 C 3  particles during flotation with different gas mixtures, as well as sedimentation. The interaction between carbide particles and Al 2 O 3  films during the melt treatment processes was also studied and reported. Factsage thermochemical software was used to model the interactions at the interface of inclusions and bubbles covered by films. The highest degree of carbide removal was obtained after flotation with an H 2 O-containing argon gas mixture, where the carbide concentration dropped below the measured solubility limit of carbon at the corresponding temperature. Strong interaction between Al 4 C 3  particles and Al 2 O 3  films was observed during sedimentation which worked as an efficient removal method for the particles. Oxidation of carbides and formation of oxycarbides were suggested as the mechanisms promoting the attachment of carbides on oxide films.

Behavior of Al4C3 Particles During Flotation and Sedimentation in Aluminum Melts