A magnetic pump in a pump well in a molten metal furnace with a long, relatively thin side wall that wraps around a significant fraction of the circumference of the pump, which facilitates creation of an eddy current based flow field in the molten material with better magnetic coupling, thereby enha
A magnetic pump in a pump well in a molten metal furnace with a long, relatively thin side wall that wraps around a significant fraction of the circumference of the pump, which facilitates creation of an eddy current based flow field in the molten material with better magnetic coupling, thereby enhancing the effectiveness of the pump. Breach of the well wall will not result in spillage of metal outside the furnace, and the well can be monitored for any such breach or other change so that the pump can be lifted out of the well to protect it from contact with the molten metal in the event of such a breach, or other appropriate action can be taken.
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1. An apparatus for circulating molten metal in a vessel containing the molten metal, the apparatus comprising: a well located entirely within the vessel and spaced apart from exterior walls of the vessel; anda magnet positioned within the well, wherein the well comprises a wall with an arcuate port
1. An apparatus for circulating molten metal in a vessel containing the molten metal, the apparatus comprising: a well located entirely within the vessel and spaced apart from exterior walls of the vessel; anda magnet positioned within the well, wherein the well comprises a wall with an arcuate portion that surrounds at least a part of the magnet and a non-arcuate portion that extends from the arcuate portion of the wall such that the non-arcuate portion forces the molten metal to flow in a path further from the well than the arcuate portion;a detector for detecting breach of the well; anda lift actuatable in response to a signal from the detector to lift the magnet out of the well. 2. The apparatus of claim 1, wherein the magnet is either rotatable or electromagnetic. 3. The apparatus of claim 1, wherein the non-arcuate portion is tangential to the arcuate portion. 4. The apparatus of claim 1, wherein the path is a tortuous path. 5. A molten metal furnace comprising: a. a main hearth,b. a side well,c. a furnace wall surrounding at least the main hearth and the side well, andd. an apparatus for agitating molten metal within the furnace, the apparatus comprising: i. a pump well comprising a generally cylindrical refractory wall positioned entirely within the furnace, adjacent to the side well and not contacting the furnace wall and comprising a non-cylindrical wall that extends from the generally cylindrical refractory wall and forces the molten metal to flow in a tortuous path further from the wall than the generally cylindrical refractory wall, andii. an eddy current pump at least partially within the pump well, the pump comprising a magnet assembly;e. a detector for detecting breach of the pump well; andf. a lift actuatable in response to a signal from the detector to lift the eddy current pump out of the pump well. 6. The furnace of claim 5, wherein the magnet assembly is a rotatable permanent magnet assembly and wherein the pump further comprises a motor for rotating the rotatable permanent magnet assembly. 7. The furnace of claim 5, wherein the magnet assembly is a stationary electromagnetic assembly. 8. The furnace of claim 5, wherein the pump well is adjacent to the side well. 9. The furnace of claim 5, further comprising a means for cooling the pump. 10. The furnace of claim 9, wherein the cooling means is a blower for injecting cooling medium into the well. 11. The furnace of claim 10, further comprising a jacket adapted for passing cooling medium around the magnet assembly. 12. The furnace of claim 5, wherein the non-cylindrical wall is tangential to the generally cylindrical refractory wall. 13. A molten metal agitation apparatus for use in a non-ferrous molten metal furnace, the apparatus comprising: a. a pump vessel positionable inside a furnace vessel and spaced apart from exterior walls of the furnace vessel,b. a magnet arrangement positioned within the pump vessel, wherein the pump vessel comprises a wall with an arcuate portion that surrounds at least a part of the magnet arrangement and a non-arcuate portion that extends from the arcuate portion of the wall and is configured so that the non-arcuate portion forces the molten metal to flow in a path further from the pump vessel than the arcuate portion, andc. a detector positioned in the pump vessel for determining at least one parameter in the pump vessel. 14. The agitation apparatus of claim 13, wherein the magnet arrangement comprises an electromagnetic assembly. 15. The agitation apparatus of claim 13 wherein the magnet arrangement comprises at least one permanent magnet and a motor for rotating the permanent magnet. 16. The agitation apparatus of claim 13, further comprising a hoist for removing the magnet arrangement at least partially out of the pump vessel. 17. The agitation apparatus of claim 16, wherein the hoist is configured to move the magnet arrangement out of the pump vessel when the detector determines the at least one parameter. 18. The agitation apparatus of claim 13, wherein the detector is a thermocouple. 19. The agitation apparatus of claim 13, wherein the detector is a conduction detector. 20. The agitation apparatus of claim 13, wherein the path is a tortuous path. 21. The agitation apparatus of claim 13, wherein the non-arcuate portion is tangential to the arcuate portion.
Anderson, Mark; Bischoff, Todd F.; Boorman, James; Fenton, Wayne J.; Sinden, David; Tingey, John Steven; Wagstaff, Robert Bruce, Elimination of shrinkage cavity in cast ingots.
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