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An article “Can a laser smelt magnesium?” explains that laser can evaporate the surface layer of the powder of magnesium oxide, and extract metal magnesium.
The following movie shows the moment that magnesium oxide vaporizes with laser for 0.5sec (1/60 high-speed videography). When magnesium oxide vaporizes in an instant, evaporated materials rise vertically. Therefore we can extract specified elements easily.
30% of collected materials are magnesium oxide, and 70% are metal magnesium. It means we can get 70% pure magnesium with laser smelting. 70% is enough for fuel. By comparison, purity of magnesium with Pidgeon method is 80% at the first stage, and then refinement process makes it purer.

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