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Aluminium, oxygen (from air), and high temperature together cause the formation of aluminium oxide on the surface of the melt. This is known as “dross”, it looks like beverage foam, and contains the impurities from the original scrap. Fluxing flushes out impurities from the melt pool to the dross, and aluminium from the dross to the melt pool.
Many substance can work as flux. Here, I use saw dust. The carbon from the wood fibers combines with the oxygen from the aluminium oxide, which helps to recuperate some aluminium. There is also a general effect of agglomeration, which eases spooning out of the dross.
Removing dross as I’m doing in this video leaves a beautiful, shiny pool of high purety aluminium.