Method of removing a metallic coating layer from scrap metal...

B - Operations – Transporting – 24 – B

Patent

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B24B 31/00 (2006.01) C22B 1/00 (2006.01) C22B 7/00 (2006.01) C22B 21/00 (2006.01)

Patent

CA 2315780

A metallic coating layer is removed at least partly from scrap metal pieces having a core and the coating layer on the core. The coating layer has a lower melting temperature than the core. The scrap metal pieces are agitated in a container with abrading elements so as to cause multiple collisions, whereby the coating layer is at least partly removed. During the agitating the container temperature is a temperature T in the range T S(coat) < T < T L(core) wherein T S(coat) is the solidus temperature of the coating layer and T L(core) is the liquidus temperature of the core. The agitation may be by rotationally tumbling or shaking the scrap metal pieces and the abrading elements.

La présente invention permet d'enlever au moins partiellement une couche de revêtement métallique de pièces de ferraille comprenant un noyau et une couche de revêtement déposée sur le noyau. La couche de revêtement possède une température de fusion inférieure à celle du noyau. On agite les pièces de ferraille dans un conteneur contenant des éléments abrasifs afin de provoquer de nombreuses collisions, qui permettent d'enlever au moins partiellement la couche de revêtement. Pendant l'agitation, la température du conteneur correspond à une température T de l'ordre de Ts (revêtement) < T < TL (noyau) où Ts (revêtement) représente la température dite "Solidus" de la couche de revêtement et TL (noyau) représente la température dite "Liquidus" du noyau. L'agitation peut se faire par tonnelage ou secouage rotatif des pièces de ferraille et des éléments abrasifs.

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