Aluminum recovery method
AssigneeCompanhia Brasileira De AlumíNio
InventorRoberto Seno Junior
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Abstract
A process for the recovery of aluminum, or recycling process, is described, which is based on separating the aluminum contained in aseptic carton packs (1), flexible packs (2) and residual aluminum alloy powder (3) used in manufacturing additive, through the selective dissolution of aluminum in a solution known as Bayer liquor and/or caustic soda, with sodium aluminate (liquid) and hydrogen gas (H2, gaseous) products. Both products can be used in an alumina refinery, the sodium aluminate is used for the production of aluminum hydroxide and the hydrogen can be used as fuel for boilers, furnaces or similar.
Claims17
An aluminum recovery process, for recovering aluminum from a recycled material containing aluminum that comprises a raw material, such as aseptic carton packs, flexible packs, aluminum powders, or similar, the process comprising the steps of:
- dissolving, via alkaline dissolution, the raw material containing aluminum in Bayer liquor, generating sodium aluminate and gaseous hydrogen;
- and
- submitting the sodium aluminate to the Bayer process for the production of alumina and later aluminum.
Dependencies are inferred from the claim text.