Aluminium Treatment — Covering, Drossing & Cleaning
Covering, Drossing & Cleaning Fluxes
Covering, drossing, and cleaning fluxes are the foundational product group of aluminium melt treatment — covering fluxes form a protective barrier over the melt surface to prevent atmospheric oxidation, drossing fluxes separate entrapped metal from the oxide layer to maximise metal recovery, and cleaning fluxes disperse into the bulk melt to agglomerate and remove suspended oxide inclusions.
CFC Egypt's EGYFLUX series addresses all three functions across powder and granular forms. Powder grades spread rapidly across open-bath furnace surfaces; granular grades are preferred for dust-controlled environments or where the flux must be raked into a thick dross layer without airborne loss. Many grades combine covering, drossing, and cleaning action in a single formulation, reducing the number of products required in the treatment sequence. All are manufactured at our Sadat City plant and are suited to reverberatory furnaces, induction furnaces, crucible melters, and holding pots across aluminium casting operations.
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Where These Fluxes Are Used
Covering, drossing, and cleaning fluxes are required in every facility that melts aluminium alloys — from gravity and die-casting foundries to secondary remelters and extrusion billet casters.
Reverberatory & Induction Furnaces
Large-capacity reverberatory furnaces with open bath surfaces lose metal rapidly to oxidation if the melt surface is left unprotected during the melting and holding cycle. Covering flux is applied as soon as the charge begins to melt and is replenished after each drossing operation. Induction furnaces benefit from granular grades that do not get entrained in the bath circulation created by the induction coil.
Secondary Aluminium Remelting
Scrap-fed remelters generate significantly more dross than primary operations because scrap surfaces are highly oxidised before they enter the furnace. A combined covering and drossing flux applied from the start of the charge-down cycle protects the melt surface and prepares the dross layer for efficient metal recovery when skimming. Reducing metal loss in the dross is the single largest lever on yield in secondary operations.
Gravity & Die Casting Holding Furnaces
In production casting — whether gravity permanent mould, low-pressure, or high-pressure die casting — the holding furnace or pot sits at temperature for extended periods between pours. Continuous oxidation during this hold time builds oxide on the bath surface and introduces oxide films into the melt. Regular covering and cleaning treatment during the shift keeps the melt surface protected and the bulk metal clean enough to meet casting quality requirements.