Aluminium Treatment — Dross Metal Recovery

Reclamation of Aluminium from Hot Skimming

Reclamation flux for hot skimming is applied to freshly skimmed hot dross immediately after it is removed from the furnace, working into the still-molten dross to separate and recover the metallic aluminium entrapped within the oxide matrix — converting a significant portion of what would be lost in the dross to recoverable metal.

Hot aluminium dross typically contains 30 to 60% metallic aluminium by weight, trapped as droplets within the oxide crust. Without treatment, this metal is lost to landfill or sold to dross processors at a fraction of its value as clean metal. CFC Egypt's EGYFLUX 950 reclamation flux, applied to the hot dross in the dross pan within minutes of skimming, reacts with the oxide to release the entrapped metal droplets, allowing them to coalesce and pool in the bottom of the pan for return to the furnace or casting as secondary metal. The time-critical nature of this treatment — the dross must remain hot enough for the metal to flow — requires the flux to be on hand at the furnace and applied as part of the skimming procedure rather than as an afterthought.

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Where Hot Skimming Reclamation Is Used

Reclamation flux is most valuable wherever aluminium dross generation is high and the economic value of the entrapped metal is significant — particularly in secondary remelting and high-volume casting operations.

Secondary Aluminium Remelters

Secondary aluminium remelters processing scrap with heavily oxidised surfaces generate the largest volumes of dross per tonne of metal produced. Metal yield — the percentage of charged metal that becomes saleable product — is the single most important economic measure in secondary operations. Applying EGYFLUX 950 to every dross skim immediately after removal captures a significant proportion of the 30 to 60% metal typically entrapped in hot dross, directly improving yield and reducing the cost of sending metal-rich dross to landfill or third-party processors.

High-Volume Casting Foundries

Automotive die casting and gravity casting foundries running three shifts generate multiple dross skims per shift. Each skim of a large reverberatory holding furnace can produce tens of kilograms of dross. Across a year's production, the accumulated metal lost in dross without reclamation treatment can amount to a significant fraction of total metal consumption. Reclamation flux treatment of every skim converts this loss into additional metal yield, with a return on investment typically achieved within the first month of consistent use.

Wrought & Extrusion Billet Casting

Extrusion billet casters operating large open-bath furnaces with continuous charge and skim cycles benefit from a structured dross management procedure that includes reclamation flux as standard. The high metal value of wrought aluminium alloy makes metal loss in dross expensive. Consistent application of reclamation flux as part of each skim procedure ensures the maximum amount of metal is recovered back to the furnace rather than leaving the plant with the dross.

Reducing Dross Disposal Cost

In addition to recovering metal value, reclamation flux treatment reduces the total volume and weight of dross that must be disposed of or sold to dross processors. A dross that has had its metal recovered by reclamation flux contains less metal value and therefore has lower disposal value but also requires less specialist handling as a non-metallic oxide residue. The net economic benefit of reclamation flux treatment accounts for both the recovered metal value and the reduction in dross processing or disposal cost.

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CFC Hot Skimming Reclamation Flux

EGYFLUX 950 — aluminium reclamation flux applied to freshly skimmed hot dross to recover the entrapped metallic aluminium before cooling.

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Frequently Asked Questions

Technical questions on aluminium dross metal recovery and how reclamation flux works.

Hot aluminium dross — freshly skimmed from a furnace at operating temperature — typically contains between 30% and 60% metallic aluminium by weight, entrapped as droplets within the oxide matrix. The exact proportion depends on how the dross was formed (melt temperature, turbulence, alloy type), how it was treated before skimming, and how quickly it is treated after skimming. Without reclamation treatment, this metal is lost to landfill or sold at a significant discount to dross processors.

Drossing flux is applied to the dross layer while it is still on the melt surface in the furnace — worked into the dross to separate entrapped metal droplets before skimming, allowing that metal to drain back into the bath. Hot skimming reclamation flux is applied after the dross has been removed from the furnace and placed in a dross pan while still hot — it is worked into the hot dross externally to the furnace, causing remaining entrapped metal to coalesce in the bottom of the pan. Both improve metal recovery and complement each other.

The effectiveness of hot skimming reclamation flux depends on the dross being at sufficient temperature for the flux to melt and the entrapped metal to remain liquid. Once dross cools below the aluminium solidification point, the entrapped metal solidifies and cannot flow to collect in a pool for recovery. Reclamation flux must be applied within minutes of skimming — while the dross is still visibly hot and the metal still mobile — to achieve maximum metal recovery. Delaying treatment significantly reduces the recoverable metal yield.

CFC Egypt manufactures EGYFLUX 950 for the reclamation of aluminium from hot dross and skimmings. It is applied immediately after skimming to the hot dross in the dross pan or pot, worked in to separate and collect the entrapped metallic aluminium for recovery. Contact CFC for dosing guidance and application procedure based on your dross volume, temperature, and operating procedure.

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Related Aluminium Treatment Products

Other CFC products that reduce dross generation and maximise metal yield in aluminium operations.

Aluminium Treatment

Degassing Flux

Powder flux that removes dissolved hydrogen from the melt before pouring, reducing gas porosity.

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Furnace Wall Cleaning Flux

Removes oxide build-up from furnace refractory walls to prevent contamination from falling scale.

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Covering, Drossing & Cleaning Fluxes

Multi-function flux powders and granules for melt surface protection and metal recovery.

All Types

Aluminium Treatment Overview

Browse all twelve aluminium treatment product categories from CFC Egypt.

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Looking to improve metal yield from your aluminium dross?

Tell us your furnace type, average dross skim weight, current dross treatment or disposal method, and target metal recovery improvement. Our technical team will recommend EGYFLUX 950 dosing rates and the skimming procedure changes that will maximise your metal recovery.

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