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Thermo-mechanical metal extraction
Hot dross processing system whereby the majority of metal is recovered without chemically reducing the aluminium oxides. The dross is first crushed then separated into aluminium metal rich particles and aluminium oxide rich particles based on density. The metal rich particles are then melted in a furnace to remove the remaining oxide particles.
Mechanical extraction vs chemical
Recycling aluminium dross mechanically is an environmentally sensitive method, and is not toxic. This is completely different from how aluminium metal used to be extracted from dross using an array of hazardous chemicals which resulted in a concentrated highly toxic 'salt cake' residue.
An example of a recycling facility
Products that can be made with the residual
A variety of products can be made from the residual aluminium dross after it is recycled into aluminium oxide. See more information on aluminium oxide. Aluminium oxide has a variety of industrial uses which includes being used in paint, dye, concrete, explosives, and fertilizer.
Dross recycling is different
Aluminium dross recycling is a completely different process to strictly aluminium recycling. Aluminium recycling is where pure aluminium metal products (previously used in another form) are re-melted into aluminium ingots and then re-used to new aluminium products. While aluminium dross recycling is where the dross, a byproduct of the smelting process in the creation of aluminium from bauxite, can be mechanically recycled thus separating the residual aluminium metal from the aluminium oxide.
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- Aluminium oxide
- "Aluminum Oxide". Aluminumsulfate.net. Retrieved 2014-06-09.
- cf Thermite
- cf Aluminium recycling