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Prof. Dr. Viktor Pocajt, CEOKey to Metals AG
Aluminum dross, a byproduct of the aluminum melting process, is a mixture of aluminum, its oxides, the oxides of alloying elements and less frequently halogenides, carbides and nitrides. Dross has some good benefits, especially considering tension strength and depending on further conditioning steps can be very useful further on.
Dross is a by-product of all aluminum melting processes. Depending on scrap type, alloy treatment and melting equipment, the amount, metal content and properties of dross vary in a wide range. Dross is a mixture of aluminum, aluminum-oxide and oxides of alloying elements, additionally halogenide, carbide or nitride compounds of these metals are regularly encountered. Typically dross contains a large amount of metallic aluminum. This is mechanically fixed in a cellular structure of aluminum oxide, which has tension strength great enough to keep aluminum 20 times of its own weight bonded. As dross also contains finely dispersed gas bubbles (foam structure), it easily separates from the aluminum melt due to the reduced density.
The following process parameters have a strong influence on volume, morphology and the metal content of dross:
A direct comparison and evaluation of the various dross conditioning processes is difficult, as the raw material source is different. Generally modern processes are based on a fast quenching step in order to avoid an oxidation of the incorporated aluminum metal droplets. It is followed by a mechanical beneficiation step which removes as much oxide as possible. Alternatively a direct melting of the > 1 mm fraction is state of the art. The by-product has to be dumped or processed separately in a slag treatment plant, the <1 mm fraction (dross residue) can be sold to the steel industry for deoxidation purposes.
Date Published: May-2014
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