Systems and methods of electrolytic production of aluminum

Patent metadata

Field	Value
Publication number	US-11078584-B2
Application number	US-201815943171-A
Country	US
Kind code	B2
Filing date	Apr 2, 2018
Priority date	Mar 31, 2017
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

In some embodiments, an exemplary electrolytic cell includes: a cathode structure disposed within an electrolysis cell, wherein the electrolysis cell is configured to produce metal on a surface of the cathode structure, wherein the cathode structure is configured to fit along a floor of the electrolysis cell, wherein the cathode structure has a sloped surface when compared to a generally horizontal plane, and wherein via the sloped surface, the cathode structure is configured to drain a metal product from the sloped surface towards a lower end of the cathode structure.

First claim

The invention claimed is:

1. An apparatus, comprising:
a cathode structure disposed within an electrolysis cell, wherein the electrolysis cell is configured to produce metal on a surface of the cathode structure;
wherein the cathode structure is configured to fit along a floor of the electrolysis cell;
wherein the cathode structure comprises (a) a support member having a first wall and an opposing second wall, and (b) at least two cathode plates attached to a support member;
wherein a first cathode plate is attached to the first wall of the support member;
wherein a second cathode plate is attached to the second wall of the support member;
wherein the at least two cathode plates are configured to be at least partially submerged in a molten electrolyte bath;

wherein the cathode structure has a sloped surface when compared to a generally horizontal plane;
wherein, via the sloped surface, the cathode structure is configured to drain a metal product from the sloped surface towards a carbon floor of the electrolysis cell.

2. The apparatus of claim 1 , wherein the cathode structure has a triangular geometry.

3. The apparatus of claim 1 , wherein the sloped surface of the cathode structure has a wall angle of from 15 degrees to not greater than 89 degrees.

4. The apparatus of claim 1 , wherein a height of the cathode structure is from 5% to 95% of a height of the molten electrolyte bath.

5. The apparatus of claim 1 , wherein the cathode structure is one of a plurality of cathode structures, wherein a cathode assembly comprises the plurality of cathode structures, and wherein the plurality of cathode structures are disposed in a generally parallel, interspaced configuration along the floor of the electrolysis cell.

6. The apparatus of claim 1 , wherein the support member comprises a carbon block, wherein the first wall is a first carbon block wall, wherein the second wall is a second carbon block wall, wherein the first cathode plate is attached to the first carbon block wall, and wherein the second cathode plate is attached to the second carbon block wall.

7. The apparatus of claim 1 , wherein the floor comprises a cathode drain angle.

8. The apparatus of claim 7 , comprising a collection area adjacent the floor, wherein the cathode drain angle of the floor is sufficient to direct the metal product to the collection area.

9. The apparatus of claim 7 , wherein the cathode drain angle is from 0 degrees to 15 degrees.

10. The apparatus of claim 9 , wherein the cathode drain angle is from 0.1 degrees to 15 degrees.

11. The apparatus of claim 10 , wherein the cathode drain angle is from 1 degree to 5 degrees.

12. The apparatus of claim 1 , wherein the cathode plates are fully submerged in the molten electrolyte bath.

13. The apparatus of claim 1 , wherein the cathode support comprises a male member extending from a bottom portion of the cathode support member;
wherein the cathode floor comprises a female portion configured to receive the male member of the cathode support;
wherein the cathode support is connected to the cathode floor via engagement of the male member of the cathode support with the female portion of the cathode floor.

14. The apparatus of claim 1 , wherein the cathode floor comprises a first slot and a second slot, wherein the first cathode plate sits in the first slot, and wherein the second cathode plate sits in the second slot.

15. The apparatus of claim 1 , wherein the support member is constructed of a first material, and wherein the first cathode plate is constructed of a second material, wherein the first material is different than the second material.

16. The apparatus of claim 15 , wherein the first material is non-aluminum wettable and wherein the second material is aluminum wettable.

17. The apparatus of claim 16 , wherein the second material is a metal boride.

18. The apparatus of claim 17 , wherein the metal boride comprises a titanium boride.

19. The apparatus of claim 15 , wherein the first material is selected from the group consisting of a refractory material, a non-aluminum wettable ceramic material, a carbonaceous material, a composite carbon-ceramic material, and combinations thereof.

20. The apparatus of claim 1 , wherein the first plate and the second plate connect near an apex of the support member.

21. A cathode for an aluminum electrolysis cell, the cathode comprising:
a supporting block having at least a first wall, wherein the first wall comprises a wall angle (beta) of from 15 degrees to not greater than 89 degrees relative to vertical;
a plurality of tiles attached to the first wall, wherein at least some of the plurality of tiles are constructed from an aluminum wettable material.

22. The cathode of claim 21 , wherein the aluminum wettable material is a metal boride.

23. The cathode of claim 22 , wherein the metal boride is a titanium boride.

Assignees

• Alcoa Usa Corp

Inventors

• Liu Xinghua

Classifications

• C25C3/08 Primary

  Cell construction, e.g. bottoms, walls, cathodes · CPC title

• Y02P10/20

  Recycling · CPC title

• C25C7/025

  used in cells for the electrolysis of melts · CPC title

• C25C3/12 Primary

  Anodes · CPC title

• C25C7/02

  Electrodes (consumable anodes for the refining the metals C25C1/00 - C25C5/00); Connections thereof · CPC title