| Suspension of metal droplets in a cover flux causes metal losses during aluminum recycling. Higher recovery will occur by selecting a salt system that can strip away the oxide layer, return the droplets into the metal and suspend inclusions into the salt for removal.;Coalescence behaviour of aluminum droplets and alumina inclusion removal under a molten salt flux were investigated using a hot stage microscope at a temperature of 740;Fluoride additions to both salt systems removed the oxide film from the metal and promoted coalescence. The fraction of inclusions remaining in the aluminum was observed to decay exponentially with time when fluoride salts were added to both salt systems. As the concentration of fluorides increased, the removal rates improved. |
