Magnesium consumes only 5% of the energy that’s used to produce primary magnesium. Its possible to remove oxides and impurities during the recycling scrap process. But not elements like copper and nickel (those have high impact on the corrosion resistance). Scrap is often sold and used in other products like steel (alloying) or anodes. With die-casting the scrap percentage is about 40-60% and because of that most die casters recycle the material (internal or external) by themselves.
For extrusion processes the scrap percentage is much less, about 25% percent.
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