Metallurgical apparatus – With means treating or handling gases exhausted by treating... – Having means to treat or handle gases evolving from rotary...
Patent
1993-12-21
1995-09-19
Kastler, Scott
Metallurgical apparatus
With means treating or handling gases exhausted by treating...
Having means to treat or handle gases evolving from rotary...
266205, 266901, F27B 702
Patent
active
054510333
DESCRIPTION:
BRIEF SUMMARY
This invention relates to apparatus for heat processing scrap materials in the recovery of their useful constituents and removal as by vapourization or burning of contaminants such as lacquer or paint coatings. The invention is particularly but not exclusively applicable to scrap metal materials, for example in the recycling of metal containers typically aluminium or aluminium alloy beverage cans.
BACKGROUND OF THE INVENTION
It is known to provide apparatus of the kind referred to and incorporating a heated furnace kiln through which the scrap material is passed, with circulation of hot gases through the kiln in a closed circuit for said vapourization or burning of contaminants. An example of such apparatus incorporating a rotary kiln is disclosed in U.S. Pat. No. 5,055,037, issued Oct. 8, 1991, the disclosure of which is incorporated by reference.
The object of the present invention is to provide heat processing apparatus for the above purpose, e.g. incorporating a rotary kiln, which is economical to manufacture and install, compact, adaptable in design, and effective and efficient in operation.
SUMMARY OF THE INVENTION
According to the invention there is provided apparatus for heat processing scrap material to separate contaminants therefrom comprising kiln structure defining an enclosed furnace chamber having a feed path extending therethrough from a material input end to a material output end of the chamber: and gas circulation means for providing a flow of heated gases into and through the chamber to act directly on material in said feed path in use; characterised in that said kiln structure includes: opens into the input end of the chamber, which formation is connected through an air-tight seal to the input end of said kiln, and from which opens an outlet flue through which the gases exit from the chamber; and discharge outlet opens from the output end of the chamber which formation is connected through an air-tight seal to the output end of said kiln: through said first formation and axially through the kiln to open into the chamber adjacent the output end, whereby the whole of said flow of gases returns through the furnace chamber from the latter end to the input end in direct contact with the material travelling in the opposite direction along said feed path in use
Said gas circulation means may include a recirculation connection externally of the kiln and at or adjacent said input end thereof for operative recirculation of at least part of the gases exhausted from the furnace through the outlet flue.
Said circulation means may further include flow inducing means for forced movement of gases through the furnace: control means for regulating the operating temperature of the gases; an after burner for high temperature disposal or breaking down of the contaminant content of the gases so exhausted at a higher temperature than the operating temperature within the chamber; and/or cooling means acting on the gases fed to the inlet duct to reduce their temperature to a predetermined level.
BRIEF DESCRIPTION OF THE DRAWING
An embodiment of the invention is now more particularly described with reference to the accompanying drawing being a diagrammatic longitudinal sectional elevation of apparatus for heat processing aluminium alloy beverage can scrap for removal from the shredded scrap material of lacquer coating and other contaminants prior to recovery and remelting of the metal content for recycling.
DETAILED DESCRIPTION
The apparatus comprises a rotary kiln 10 defining an enclosed furnace chamber 12. The axis of the kiln is inclined so that it slopes downwardly from its material input end 14 to its material output end 16 i.e. from left to right as viewed in the drawing, the extremities of the rotating kiln being provided with airtight seals 18, 20 connecting it with respective non-rotating upper and lower enclosure formations 22, 24 at said respective ends in conventional manner.
The scrap material is fed into the chamber from a hopper or the like (not shown) through a delivery chute 26 openi
REFERENCES:
patent: 1441351 (1923-01-01), Hindshaw
patent: 4200262 (1980-04-01), Evans et al.
patent: 5186740 (1993-02-01), Sancinelli
Perry Ophneil H.
Riley Geoffrey
Kastler Scott
Stein Atkinson Stordy Limited
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