ABSTRACT
For many years aluminum produced by remelting scrap was less valuable than primary metal produced from bauxite. The reason for this was concern over the purity of the recycled metal, which was often inferior to that of primary. The development of refining technology for molten aluminum is the main reason this stigma no longer exists and is why recycled metal now competes with primary in almost every application. Much of the technology used for refining molten aluminum has been introduced only in the past 20 years, and what was once a minor footnote in an aluminum production flowsheet is a now a major consideration.
