Recovery of non-ferrous metals from dross

C - Chemistry – Metallurgy – 22 – B

Patent

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Details

C22B 7/04 (2006.01) C22B 9/16 (2006.01) C22B 21/00 (2006.01) C22B 21/06 (2006.01) F27B 14/14 (2006.01) F27D 99/00 (2010.01) F27B 7/00 (2006.01) F27D 23/00 (2006.01)

Patent

CA 2130798

The invention relates to a method for recovering non-ferrous metal from a dross starting material containing this metal, optionally together with non-ferrous metal scrap, and/or a starting material comprised of such scrap. The method comprises introducing the starting material into a rotary furnace or rotatable converter provided with a refractory lining, heating the starting material to a temperature above the melting point of the metal while rotating the furnace either continuously or intermittently, and removing the resultant molten metal from beneath the overlying dross residues. The method is characterized by heating the starting material in the absence of a protective salt layer with the aid of a so-called oxy-fuel-burner which is supplied with a fossil fuel and with a gas that contains at least 80 % oxygen, and by rotating the furnace at a speed of 5 r.p.m or lower.

Procédé de récupération de métaux non ferreux contenus dans les crasses, facultativement en même temps que des déchets métalliques non ferreux et/ou des produits de départ contenus dans ces déchets. Le procédé consiste à introduire les matières de départ dans un four tournant ou dans un convertisseur tournant pourvu d'une garniture réfractaire, à porter le produit de départ à une température supérieure au point de fusion du métal tout en faisant tourner le four soit de manière continue soit de manière intermittente, et à extraire le métal en fusion résultant de dessous la couche de résidus de crasses qui le recouvre. Le procédé se caractérise par un chauffage du produit de départ en l'absence d'une couche de sel protectrice, à l'aide d'un brûleur combustible/oxygène alimenté par un combustible fossile et un gaz renfermant au moins 80% d'oxygène, et à faire tourner le four à une vitesse de 5 tours minute ou inférieure.

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