Metal recovery process

Details Metal recovery process Metal recovery process

C - Chemistry, Metallurgy

22

B

39/111, 53/20, 5

C22B 7/04 (2006.01)

Patent

CA 1191694

ABSTRACT OF THE DISCLOSURE An improved method for recovery of metal, particularly aluminum, from metal bearing dross (14) utilizes a trough (13) for collection of the dross (14). A wedge member (28) compresses the dross (14) in the trough (43). In this manner, metal is decanted from the compressed dross and flows through slots in the bottom or passages (25) in the walls of the trough (43) for collection in a pan (26), or becomes concentrated at the edges or walls of the volume of dross. The trough (43) and wedge members (28) also serve to cool the dross material thereby diminishing metal loss due to thermite reaction. The compressed dross coalesces and solidifies, is broken and is mechanically separated. The larger dross components from the separation process are substantially metallic and may be recycled through the furnace (10). The remaining components are charged in a vortex melting furnace (36) for the lowest possible melt loss. This also effects segregation of the remaining metal from the dross by melting the metal and allowing the dross to rise to the top of the bath. The improved method of the present invention provides for recovery of about 95% of aluminum metal from a dross which contains about 70% aluminum as compared with a recovery rate of about 50% aluminum metal utilizing a generally known prior art technique.

401547

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