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How pure is primary aluminum when it leaves a smelting cell?
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aluminum processing
Rolls of processed aluminum.
When primary aluminum is siphoned from a smelting cell, it is approximately 99.8 percent pure.1
Following this stage, the metal may be poured directly into molds to create foundry ingot, or it may be transferred to holding furnaces for further refining or alloying to meet specific industrial requirements.1