1) filtration - the use of filters allows you to reduce by half the impurities in the metal. As filtering material is used: - magnesia brick with 5-7 mm pieces heated to 700oC - calcium fluoride and magnesium fluoride alloy in a 1: 1 ratio, - magnesia brick saturated with salts, - glass fabric mesh.
2) aluminum electrorefining - 3 layers method; Fe content drops to 0.1%.
3) Beck process
In Mg and Mg alloys, iron content is reduced by addition of Zr, Ti, and B (Zr is considered more effective). Purification is by formation of Zr3Fe, ZrFe2 intermetallic particles that settle at the bottom of the melt. I do not know if this approach will work in Al.
Because Fe is more noble than the Aluminium, unfortunately there is no industrial way to reduce the metallic dissolved Fe from Al melts. The only industrial way is diluting the melt with primary Al.
But if Fe is found in the melt in a non-metallic form such as solid inclusions, then filtration might work depending on the size of the particles
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