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AssigneeTeledyne Industries, Inc.
InventorsGregory Todhunter Roberts, David Vincent Owens, Raymond Frank Goodspeed
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A magnesium reclamation process whereby magnesium and magnesium alloy fines, chips and scraps may be recovered and remelted for reuse. The method is comprised of the steps of pelletizing the magnesium by first compacting the magnesium with a low pressure press so as to initially expel the majority of the air, followed by a high pressure press under a controlled environment to form a compact pellet. The pellets are then melted either by stacking on the cold heel of a pot and heating under a controlled environment or pre-heating in a basket over a melt, and then subsequently immersing the load. Melting can also be accomplished by controlled melting, utilizing an induction melting furnace whereas temperature can be slowly increased. Pelletizing pressures range from approximately the yield pressure to the cold welding pressure of the material being reclaimed. A typical pelletizing environment is 20% SF.sub.6 and 80% CO.sub.2 and a suitable melting environment is 98% CO.sub.2 and 2% SF.sub.6.
A method of compacting magnesium fines, chips and scraps comprising the steps of:
A method of compacting magnesium fines, chips and scraps comprising the steps of:
A method of recovering magnesium fines, chips and scraps comprising the steps of:
A method of recovering magnesium fines, chips and scraps comprising the steps of:
A method of recovering magnesium fines, chips and scraps comprising the steps of:
Dependencies are inferred from the claim text.
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No related US applications are recorded in the indexed filing history.
For consolidating scrap metal or for compacting used cars: for briquetting scrap metal
Binding; Briquetting ; Granulating: of metal scrap or alloys
Obtaining alkaline earth metals or magnesium: obtaining magnesium
Technologies related to metal processing: recycling
Term ended 27 Dec 1994 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention relates to the field of recovery of scrap metals, and more particularly to the recovery and remelting of magnesium and magnesium alloy fines, chips and scraps.
2. Prior Art
FIG. 1 is a partial cross section of the preferred embodiment of compactor of the present invention.
FIG. 2 is a schematic representation showing the manner of melting the pellets.
FIG. 3 is a schematic representation of an alternate embodiment compactor.
The present invention comprises a method and apparatus for the recovery and remelting of magnesium fines, chips and scrap in a safe, efficient and practical manner. The invention is particularly useful for the recovery of what otherwise would comprise magnesium waste from machine shops and the like, wherein the magnesium waste may include relatively fine powders, milling and turning chips and other forms of scrap in varied mixes, often having a low aggregate density.
The invented process comprises two major steps. These are first, the compacting or pelletizing of the magnesium into pellets or wafers having a density approaching that of the solid material, and second, the remelting of the pellets under controlled conditions to minimize oxidation and provide maximum recovery thereof. As shall subsequently be seen, these steps are each carried out in such a way as to allow the efficient recovery of magnesium in quantity, thereby not only solving the problems of disposal, but also providing direct economic incentives for recovering magnesium by this method.
Now referring to FIG. 1, a schematic representation of the compactor or pelletizer of the present invention may be seen. The compactor has a housing 20 defining a cylindrical chamber 22 which may receive the magnesium fines, chips and scraps through an opening 24 at one end thereof when the piston 26 is withdrawn by the hydraulic cylinder 28. A door 30 supported on pivots 32 closes the opposite end of chamber 22, with the door being retained in the closed position by a lock 34 pivotally supported from the housing 20 by pivot 36. The assembly comprising lock 34 contains an arm 38 driven by a small hydraulic cylinder 40 so as to controllably rotate the lock 34 from the locked position as shown in the figure to a lower unlocked position. Also the door itself may be driven in rotation by a third hydraulic cylinder 42 coupled between the housing 20 and the door 30 at a position above the pivot 32.