Apparatus and method for recovering non-ferrous metals from...

C - Chemistry – Metallurgy – 22 – B

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C22B 21/00 (2006.01) C22B 9/02 (2006.01)

Patent

CA 2216626

Method and apparatus for recovering free aluminum from a metal bearing dross containing free aluminum metal and oxides of the metal. Hot dross (14) is collected from a hot dross source (10) into a vessel (12), and the vessel (12) is placed into a sealable storage container (18). The storage container (18) is insulated to maintain heat generated by the hot dross within the interior of the storage container to maintain the dross at or near its temperature when first placed in the storage container. An inert gas is then introduced into the container to purge the container (18) of all gases other than the inert gas. The inert gas reduces thermiting of the hot dross and limits the cooling of the hot dross in order to maintain the hot dross at an elevated temperature while the hot dross remains in the storage container (18). The dross (14) is then removed from the vessel (12) and introduced into a dross processing device (26) such as a furnace.

On décrit un procédé et un dispositif de récupération de l'aluminium libre à partir de crasses métallifères contenant de l'aluminium libre ainsi que des oxydes de ce métal. On recueille dans une cuve (12) des crasses chaudes (14) provenant d'une source (10) de crasses chaudes, et on place cette cuve (12) dans un conteneur (18) de stockage que l'on peut fermer. Ce conteneur (18) est isolé afin de garder, à l'intérieur, la chaleur produite par les crasses chaudes, et conserver ces crasses à la température qu'elles avaient lorsqu'on les a placées dans le conteneur de stockage, ou à une température proche. On introduit alors un gaz inerte dans le conteneur pour purger celui-ci (18) de tous les gaz autres que le gaz inerte, lequel diminue l'aluminothermie des crasses chaudes et limite le refroidissement de celles-ci, de manière à maintenir ces crasses à une température élevée pendant la durée de leur séjour dans ledit conteneur (18). On enlève ensuite ces crasses (14) de la cuve et on les introduit dans un dispositif (26) de traitement des crasses, tel qu'un four.

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