Why are aluminium salt slag and dross hazardous?

Salt slag (10 03 08*) and black dross (10 03 09*) react with water and moisture to release ammonia, methane, and hydrogen, and they leach soluble salts — so they are hazardous. Dedicated rotary-kiln recyclers recover metal, salt, and non-metallic product in closed systems.

Can spent pot lining (SPL) be recycled?

Yes. SPL carbon and refractory fractions are processed to recover energy and fluoride, or used as a flux and fuel in cement and steelmaking — avoiding landfill, which is restricted due to cyanide and fluoride content.

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Recover Metal and Salt From Aluminium Smelting Residues

Name: SymbioFlows Platform
Availability: InStock
Author: SymbioFlows

Salt slag and dross hold recoverable aluminium, salt flux, and non-metallic product. SymbioFlows connects primary and secondary smelters with licensed recyclers who close the loop.

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~15–25 kg

Dross generated per tonne Al

src: European Aluminium

5–10%

Aluminium recoverable from salt slag

src: industry avg

~90%

Salt slag recycling rate (EU)

src: European Aluminium

~95%

Energy saving vs primary Al

src: World Aluminium

Key Waste Streams — EWC Codes & Buyers

EWC Code	Material	Description	Who Buys It
10 03 08*	Salt Slags (hazardous)	Salt-flux slag from secondary aluminium melting — reactive with water.	Salt slag recyclers (rotary kiln)
10 03 09*	Black Drosses (hazardous)	Oxide and metal dross from secondary smelting.	Dross processors, metal recovery
10 03 02	Anode Scraps	Spent carbon anode butts from primary smelting.	Anode paste, carbon recyclers
10 03 05	Waste Alumina	Off-spec and spent alumina from the process.	Steelmaking flux, refractory, cement
10 03 16	Skimmings	Surface skimmings other than flammable (10 03 15*).	Dross recyclers, oxide recovery
10 03 19*	Flue-gas Dust (hazardous)	Fluoride-bearing dust from gas cleaning.	Fluoride recovery, stabilisation