But that process by itself is always going to be more energy efficient than winning the aluminum from bauxite ore.
Of course you need a purification step after dealing with scrap, but aluminum scrap, even when contaminated is quite valuable, basically the price is a function of how pure it already is.
Of course you need a purification step after dealing with scrap, but aluminum scrap, even when contaminated is quite valuable, basically the price is a function of how pure it already is.