Firstly, primary classification and graded stacking of waste aluminum, such as pure aluminum, deformed aluminum alloys, cast aluminum alloys, mixtures, etc. This is very important, such as Shanghai Xinge Nonferrous Metals Co., Ltd., the largest importer of aluminum waste in China, where the import volume of aluminum waste accounts for over one tenth of the total import volume in the country. Its raw material processing is highly computerized, and all incoming raw materials are stored in zones. Inventory is managed and applied based on quantity, chemical composition, recovery rate, and cost. With this information, the melting process can calculate the most economical material formula for producing alloy ingots and ensure product quality.

For waste aluminum products, they must be disassembled to remove steel and other non-ferrous metal parts connected to the aluminum material, and then processed into waste aluminum material through processes such as cleaning, crushing, magnetic separation, and drying. For light, thin, and loose pieces of scrap aluminum, such as locking arms, speed gear sleeves, and aluminum shavings on cars, hydraulic metal packaging machines should be used to press them into packages. For steel core aluminum stranded wire, the steel core should be separated first, and then the aluminum wire should be wound into coils.

Lower its mechanical performance and weaken its corrosion resistance. The iron content should generally be controlled at 1. Below 2%. For an iron content of 1. More than 5% of scrap aluminum can be used as a deoxidizer in the steel industry, and commercial aluminum alloys rarely use scrap aluminum with high iron content for melting. At present, there is no very successful method in the aluminum industry to satisfactorily remove excess iron from scrap aluminum, especially iron in the form of stainless steel.

Waste aluminum often contains organic non-metallic impurities such as paint, oil, plastic, rubber, etc. Before returning to the furnace for smelting, efforts must be made to remove it. For wire type waste aluminum, measures such as mechanical grinding or shear peeling, heating peeling, chemical peeling, etc. can generally be used to remove the foreskin.