One experienced in the art of res-melting scrap metal is familiar with numerous other modifications that may be employed including the addition of small amounts of caustic soda, alkali silicates and other additives to improve subsequent handling of the skimmed dross or improve the purification process being effected by the fluxing operation.
In any case, the dross is removed by skimming and allowed to solidify in large chunks, usually in iron or steel containers, for subsequent processing. The subsequent processing comprises the separation of recoverable aluminum for resmelting, and disposal of the waste dross product. This processing includes grinding the solid waste dross into a powder form, from which aluminum flakes are separated by a screening operation.