Method and apparatus for circulating a molten media

• US 3,984,234 A
• Filed: 05/19/1975
• Issued: 10/05/1976
• Est. Priority Date: 05/19/1975
• Status: Expired due to Term

• Current Assignee: Aluminum Company of America (Howmet Aerospace, Inc.)
• Original Assignee: Aluminum Company of America (Howmet Aerospace, Inc.)
• Inventors: Herrick, Joseph Raymond, Claxton, Raymond Joffre
• Primary Examiner(s): Andrews, M. J.
• Application Number:
  US05/578,762
• Time in Patent Office: 505 Days
• Field of Search: 75/65 R, 75/68 R, 415/214, 415/200, 266/216, 266/235, 266/901
• US Class Current: 75/671
• CPC Class Codes: C22B 21/066 Treatment of circulating aluminium, e.g. by filtration C22B21/068 takes precedence
• CPC Class Codes: F04D 7/065 for liquid metal
• CPC Class Codes: Y10S 266/901 Scrap metal preheating or melting

Abstract

A method and apparatus for moving molten media such as molten metal or molten salt through a metal treating system utilizing a vaned disc immersed in the media and located in a cylindrical portion of an open-ended volute so as to provide above the disc a body of the media having an unconfined surface.

Claims

1. A method for pumping a molten media comprising the steps of:

a. providing said molten media in a housing having a substantially right cylindrical portion with a circumferentially slotted opening therein for transferring molten media from said housing; and

b. impelling said molten media from said housing through said slotted opening by action of a disc located in said cylindrical portion and rotating substantially about the axis thereof, said disc immersed in said molten media to provide thereabove a body of said molten media having an unconfined surface, said disc having downwardly extending vanes thereon that sweep past at least a portion of said slotted opening and force the molten media outward through said slotted opening.

9. The method according to claim 1 wherein the housing is substantially vertical and open-ended to the atmosphere.

10. The method according to claim 1 wherein said disc is immersed sufficiently in said melting media to substantially prevent vortexing of said body of melting media in said housing above said disc upon rotation of said disc.

11. The method according to claim 10 wherein said body of molten melting media above said disc is kept molten by providing heat thereto.

12. The method according to claim 11 wherein the body of molten melting media is kept molten by circulating melting media thereto through a passage in said disc.

2. A pumping system for a molten media comprising:

a. a housing for receiving molten media, said housing having a cylindrical portion with a cirumferentially slotted opening therein for transferring molten media from said housing; and

b. a disc positioned in said cylindrical portion to provide thereabove a space in said housing for a body of said melting media such that said body has an unconfined surface, said disc adapted for rotation substantially about the axis of said cylindrical portion and having vanes extending downwardly therefrom arranged for sweeping past portions of said slotted opening, said vanes adapted for forcing the molten media against said disc and outward through said slotted opening.

13. A system according to claim 2 wherein said housing is substantially vertical.

14. A system according to claim 13 wherein said conduit is open-ended.

15. A system according to claim 13 wherein said housing above said disc has a cross-section at least equal to the cross-section of said disc.

16. A system according to claim 2 wherein said disc has a passage therethrough from the vane side to the body of melting media.

17. A system according to claim 2 wherein said disc diameter is in a range of 1/2 to 3 in. less than the diameter of said cylindrical portion.

18. A system according to claim 2 wherein said disc is located above said circumferential slotted opening and said vanes on said disc extend downwardly across said slotted opening.

19. The system according to claim 2 wherein the disc has four vanes projecting radially to substantially divide the disc into quadrants.

20. The system according to claim 19 wherein said vanes have a canted surface portion which in response to rotation of said disc move said melting media upwardly and outwardly.

3. A method for quiescently transferring a molten melting media from a heating bay to a melting area in a recirculating metal melting system comprising the steps of:

a. moving said molten media from said heating bay and upwardly through an inlet to a housing having a substantially right cylindrical portion with a circumferentially slotted opening therein, said slotted opening located above said inlet; and

b. impelling said molten media from said housing through said slotted opening by action of a disc located in said cylindrical portion and rotating substantially about the axis thereof, said disc immersed in said melting media to provide thereabove a body of said melting media having an unconfined surface, said disc having downwardly extending vanes that sweep past a portion of said slotted opening and force the molten media against said disc and outward through said slotted opening.

5. The method of claim 3 including forcing said molten media through an outwardly diverging conduit having an outlet which discharges into said melting bay, the outlet commensurate in extent with extent of the melting bay to facilitate sweeping the molten media across the melting bay, the outlet further positioned to apply the melting media near the molten metal surface of the melting bay.

21. The method according to claim 3 wherein said body has a depth such that vortexing of said body of melting media does not occur on rotation of said disc.

22. The method according to claim 21 including circulating molten melting media to the body of molten melting media above said disc to prevent solidification of said body.

23. The method according to claim 22 wherein said melting media is circulated through a passage in said disc.

32. The method according to claim 5 including circulating a portion of said molten melting media through a passage in said disc to said body above said disc, simultaneous with impelling said molten melting media from said housing.

35. The method according to claim 3 including, providing a layer of material selected from the group consisting of non-oxidizing gas and salt in said housing above said body of said melting media.

36. The method according to claim 35 wherein said layer includes a gas selected from the group consisting of helium, neon, argon, krypton, xenon, nitrogen, and carbon dioxide.

4. A pumping system for quiescently transferring a molten melting media from a heating bay to a melting bay in a metal melting process comprising:

a. a housing having,

i. an inlet to introduce molten melting media to said housing,

ii. a substantially right cylindrical portion, and

iii. a circumferentially slotted opening in said cylindrical portion located above said inlet, said slotted opening adapted for passing molten melting media from said housing; and

b. a disc located in said cylindrical portion arranged to provide thereabove a space in said housing for a body of said melting media such that said body has an unconfined surface, said disc adapted for rotation substantially about the axis of said cylindrical portion and having vanes extending downwardly and arranged for sweeping past portions of said slotted opening, said vanes adapted for forcing the molten media against said disc and outward through said slotted opening.

6. A pumping system of claim 4 including a conduit for carrying said molten melting media from said housing to said melting bay, said conduit diverging outwardly from said slotted opening to an outlet in said melting area, said outlet commensurate in extent with the extent of said melting bay to facilitate sweeping the molten media across the melting bay, the outlet further being positioned to apply the melting media near the surface of the melting bay.

7. A pumping system according to claim 6 wherein said conduit is elevated at an angle in a range of 5°

to 15°

from said slotted opening in said cylindrical portion to said outlet in said melting bay.

8. The pumping system according to claim 7 wherein the angle of elevation is 10°

.

25. A pumping system according to claim 4 wherein said housing has a circular cross-section throughout its height having a diameter at least equal to the diameter of said disc.

26. A pumping system according to claim 4 wherein said disc has a passage therethrough from the vane side to the body of melting media.

27. A pumping system according to claim 26 wherein said disc diameter is in a range of 1/2 to 3 in. less than the diameter of said cylindrical portion.

28. A pumping system according to claim 4 wherein said disc is located above said slotted opening and said vanes on said disc project downwardly across said slotted opening.

29. The pumping system according to claim 4 wherein said disc has four vanes extending radially to substantially divide said disc into quadrants.

30. The pumping system according to claim 29 wherein said vanes have a canted surface portion which in response to rotation of said disc move said melting media upwardly and outwardly.

24. A method for quiescently transferring a molten melting media from heating bay to a melting area in a metal melting system comprising the steps of:

a. introducing said molten melting media from said heating bay to a substantially vertical housing having;

i. an inlet for introducing said molten melting media to said housing,

ii. a cylindrical portion, and

iii. a circumferentially slotted opening in said cylindrical portion for transferring said melting media from said housing and said inlet located below said slotted opening;

b. impelling said molten media from said housing through said slotted opening by action of a disc located in said cylindrical portion and rotating substantially about the axis thereof, said disc immersed in said melting media to provide thereabove a body of said melting media having an unconfined surface, said disc having downwardly extending vanes thereon that sweep past a portion of said slotted opening and force the molten melting media against the disc and outward through said slotted opening; and

c. simultaneous with said impelling, circulating molten melting media through said disc to said body above said disc.

31. A pumping system for quiescently transferring a molten melting media from a heating bay to a melting bay in a metal melting process comprising:

a. a housing having;

i. an inlet to provide molten melting media to said housing,

ii. a substantially right cylindrical portion,

iii. an open-ended top portion, and

iv. a circumferentially slotted opening in said cylindrical portion located above said inlet, said slotted opening having an included arc in a range about 70°

to 120° and

adapted for passing molten melting media from said housing;

b. a disc positioned in said cylindrical portion to provide thereabove a space in said housing for a body of said melting media such that said body has an unconfined surface, said disc adapted for rotation substantially about the axis of said cylindrical portion and having;

i. a diameter in a range of 1/2 to 3 inches less than said cylindrical portion,

ii. a location in said cylindrical portion above said slotted opening, and

iii. four vanes thereon extending downwardly and projecting radially outwardly dividing said disc into quadrants, said vanes having a canted surface portion which in response to rotation of said disc moves said melting media upwardly and outwardly; and

c. a passage through said disc to circulate molten melting media to the body above said disc.

34. The pumping system of claim 31 including a conduit for carrying said molten melting media from said housing to said melting bay, said conduit diverging outwardly and sloping upwardly at an angle of 10°

from said slotted opening to an outlet in said melting bay commensurate in extent with the extent of said melting bay, said outlet positioned to apply said melting media near the surface of said melting media in said melting bay.

33. A method for quiescently flowing a molten melting media from a heating bay to a melting bay for metal scrap in a recirculating metal melting process comprising the steps of:

a. introducing said molten media from said heating bay through a conduit to a housing having a cylindrical portion with a circumferentially slotted opening therein for discharging said molten media from said housing;

b. impelling said molten media from said housing through said slotted opening by action of a disk positioned in said cylindrical portion and rotating substantially about the axis thereof, said disc immersed in said melting media providing thereabove a body of said melting media having an unconfined surface, said disc having downwardly extending vanes that sweep past at least a portion of said slotted opening and force the molten media outwards through said slotted opening and through an outwardly diverging conduit having an outlet which discharges into said melting bay, the outlet commensurate in extent with extent of the melting bay to facilitate sweeping the molten media across the melting bay, the outlet further positioned to apply the melting media near the molten metal surface of the melting bay; and

c. simultaneously with said impelling step, circulating said melting media through a passage in said disc to the body above said disc.