Casting aluminum ladles - GIF

[Frank S]

In melting any aluminum if you had a way to slowly stir the liquid near the bottom and inject pure Argon not only will this help to reduce the oxides but will cause the hydrogen molecules to be absorbed in the Argon bubbles and rise to the surface where it can be removed with the draff. This will aid in degassing by removing the hydrogen and other impurities, also will help to reduce porosity and shrinkage of castings.