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1. WO2012019027 - SYSTÈME DE FOUR ROTATIF ET BASCULANT, ET PROCÉDÉS DE RÉCUPÉRATION D'ALUMINIUM

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

What is claimed is:

1. A furnace system (10) for reclaiming aluminum from a charge of aluminum-containing material, comprising:

a furnace vessel (12) configured to be driven to rotate about a longitudinal axis of the furnace vessel, the furnace vessel including an inlet passage (18) in an end of the furnace vessel; and

a door assembly (16) configured to selectively cover the inlet passage and including:

a first portion that includes a panel (40) arranged transverse to the longitudinal axis of the furnace vessel, the first portion held by a support structure (68, 70) so as to be rotationally stationary with respect to rotation of the furnace vessel; and

a second portion (38) located between the first portion and the furnace vessel, the second portion defining a passage (54) between the panel of the first portion of the door and the inlet passage of the furnace vessel, the second portion configured to rotate with the rotation of the furnace vessel by a transfer of rotational force from the furnace vessel to the second portion, the first and second portions combining to cover the inlet passage to control an atmospheric environment inside the furnace vessel.

2. The furnace system of claim 1, wherein the furnace system is configured to heat the aluminum from the charge of aluminum-containing into a molten state in the furnace without introduction of a charge of salt for retarding thermitting of the aluminum.

3. The furnace system of any one of claims 1-2, wherein the panel includes a passage for a burner assembly to access the inside of the furnace vessel through the passage in the second portion of the door assembly.

4. The furnace system of any one of claims 1-3, wherein the panel includes a passage (58) for a temperature sensor to measure temperature inside the furnace vessel through the passage in the second portion of the door assembly.

5. The furnace system of any one of claims 1-4, wherein the panel includes a passage (60) for at least one of an oxygen sensor to measure free oxygen presence in the furnace vessel, to control oxygen level in the furnace, or to control air flow to a burner.

6. The furnace system of any one of claims 1-5, further comprising a conveyor (28) for introducing material through a corresponding conveyor passage in the panel, through the passage in the second portion and into the furnace vessel.

7. The furnace system of claim 6, wherein the conveyor is a screw conveyor

(64).

8. The furnace system of any one of claims 6-7, wherein the material introduced with the conveyor includes the charge of aluminum-containing material.

9. The furnace system of any one of claims 6-8, wherein the material introduced with the conveyor includes quench for slag that remains in the furnace vessel following reclamation of aluminum.

10. The furnace system of claim 9, wherein the quench is aluminum oxide.

11. The furnace system of any one of claims 6-10, wherein the conveyor is configured to hold inert material in the conveyor during melting of the aluminum in the furnace vessel to limit air entry into the furnace vessel through the conveyor.

12. The furnace system of any one of claims 1-11, further comprising a tap (34) in a sidewall of the furnace vessel through which molten aluminum is removed from the furnace assembly.

13. The furnace system of any one of claims 1-12, wherein the second portion of the door assembly includes an annular member and vents (52) in the annular member for effluent to exit the furnace vessel.

14. The furnace system of any one of claims 1-13, further comprising a seal member (48) between the furnace vessel and the second portion of the door assembly.

15. The furnace system of claim 14, wherein the seal member is made of ceramic fiber.

16. The furnace system of any one of claims 1-15, wherein the door assembly further includes an annular bearing assembly (44) located between the first and second portions of the door assembly.

17. The furnace system of any one of claims 1-16, wherein the support structure (68, 70) includes an arm (68) that is linked to the panel and a pedestal (70) that supports the arm, the arm moveable to move the door assembly between an open position and a closed position with respect to the furnace vessel.

18. A method of reclaiming aluminum from a charge of aluminum-containing material, comprising

rotating a furnace vessel (12) containing the charge of aluminum-containing material, the rotation of the furnace vessel causing rotation of a rotating portion (38) of a door assembly (16); and

firing a burner (24) through a passage of a non-rotating portion (40) of the door assembly, the rotating portion sealed against the furnace vessel so that the rotating part and the non-rotating portion of the door assembly combine to cover an inlet passage of the furnace vessel to control an atmospheric environment inside the furnace vessel, and heat from the burner melting the aluminum in the charge of aluminum-containing material without introduction of a charge of salt for retarding thermitting of the aluminum.

19. The method of claim 18, further comprising tapping molten aluminum through a tap (34) in a sidewall of the furnace vessel.

20. The method of any one of claims 18-19, wherein the charge of aluminum-containing material is introduced into the furnace vessel through the non-rotating portion of the door assembly using a conveyor (28).

21. The method of claim 20, wherein the conveyor holds inert material in the conveyor during melting of the aluminum in the furnace vessel to limit air entry into the furnace vessel through the conveyor.

22. The method of any one of claims 18-21, wherein quench for slag that remains in the furnace vessel following reclamation of aluminum is added through the non-rotating portion of the door assembly using a conveyor (28).