Process for producing elements from a fused bath using a metal strap and ceramic electrode body nonconsumable electrode assembly

• US 4,457,811 A
• Filed: 12/20/1982
• Issued: 07/03/1984
• Est. Priority Date: 12/20/1982
• Status: Expired due to Fees

• Current Assignee: Aluminum Company of Egypt
• Original Assignee: Aluminum Company of Egypt
• Inventors: Byrne, Stephen C.
• Primary Examiner(s): Williams, Howard S.
• Application Number:
  US06/451,073
• Time in Patent Office: 561 Days
• Field of Search: 204/60, 204/64-71, 204/243 R, 204/286, 204/288, 204/297 R
• US Class Current: 205/369
• CPC Class Codes: C25C 3/12 Anodes
• CPC Class Codes: C25C 7/025 used in cells for the electrolysis of melts

Abstract

A nonconsumable electrode assembly suitable for use in the production of metal by electrolytic reduction of a metal compound dissolved in a molten salt, the assembly comprising a ceramic electrode body and a metal subassembly of a metal conductor rod and at least one metal strap affixed to an end of the rod with opposing portions extending radially outwardly from the rod axis and having the ends of the strap attached to the electrode body.

Claims

1. An assembly of a ceramic electrode body and a metal conductor rod for use in the production of an element selected from the group consisting of aluminum, lead, magnesium, zinc, zirconium, titanium and silicon by electrolytic reduction of a compound comprised of such element dissolved in a molten salt, the assembly comprising:

a ceramic electrode body;

a subassembly including a metal conductor rod having at least one metal strap affixed to an end of the rod and the strap having opposing portions extending radially outwardly from therod axis, the end of the rod and the strap portion affixed thereto spaced apart from said ceramic body a distance sufficient to avoid contact between said ceramic body and the affixed strap portion during said use of said assembly; and

means for attaching end portions of the strap to said body.

2. An assembly as described in claim 1 wherein said body includes an opening therein, and said subassembly is spaced apart from an interior bottom surface within the opening of the body.

3. An assembly as described in claim 2 wherein said metal strap is U-shaped with the legs of the U projecting upwardly around the conductor rod.

4. An assembly as described in claim 1 wherein said ceramic body includes a portion for attachment to said strap, said body portion having a free metal or metal alloy therein.

5. An assembly as described in claim 4 wherein said attaching means is a metal bond connection.

6. An assembly as described in claim 4 wherein said attaching means is a weld.

7. An assembly as described in claim 4 wherein said body portion is a chemically reduced portion of said ceramic electrode body.

8. An assembly as described in claim 4 wherein said free metal or metal alloy is selected from the group consisting of Fe, Ni, Al, Mg, Ca, Co, Sn, Ti, Cr, Mn, Zr, Cu, Nb, Ta, Li, Y, Pt, Pd and Ir.

9. The assembly as described in claim 4 wherein said ceramic electrode body includes at least one metal oxide.

10. The assembly as described in claim 9 wherein said body portion is a chemically reduced portion of said ceramic electrode body.

11. The assembly as described in claim 4 wherein said ceramic electrode body includes at least one metal compound comprised of at least two metal oxides.

12. The assembly as described in claim 11 wherein said body portion is a chemically reduced portion of said ceramic electrode body.

13. An assembly of a ceramic electrode body and a metal conductor rod for use in the production of an element selected from the group consisting of aluminum, lead, magnesium, zinc, zirconium, titanium and silicon by electrolytic reduction of a compound comprised of such element dissolved in a molten salt, the assembly comprising:

a ceramic electrode body having an opening therein and at least a portion of said body having a free metal or metal alloy therein;

a subassembly comprised of a metal conductor rod having at least one U-shaped metal strap affixed to an end of the rod in a manner that the legs of the U project outwardly from the rod axis and upwardly around the rod, and the end and the strap portion affixed thereto spaced apart from an interior bottom surface of said opening a distance sufficient to avoid contact between the bottom surface and the affixed strap portion during said use of said assembly; and

weld means for attaching the strap to the body.

14. A process for producing an element selected from the group consisting of aluminum, lead, magnesium, zinc, zirconium, titanium and silicon by electrolytic reduction of a compound comprised of such element dissolved in a molten salt, said process including providing a nonconsumable electrode assembly by the steps of:

providing a ceramic electrode body;

providing a subassembly comprised of a metal conductor rod having a portion of at least one metal strap affixed to an end of the rod, the strap having opposing portions extending radially outwardly from the rod axis and the strap adapted to provide a space between said ceramic body and the strap portion affixed to the rod end, the space sufficient to avoid contact between said ceramic body and the strap portion affixed to the rod end during said process; and

providing means for attaching portions of the strap to said ceramic body.

15. A process as described in claim 14 whereby the step of providing said ceramic electrode body includes providing a body having an opening therein and further includes disposing at least a portion of said subassembly within said opening with the rod end having the strap affixed thereto spaced apart from an interior surface on the bottom of the opening.

16. A process as described in claim 15 whereby the step of providing said subassembly includes providing a subassembly having said metal strap in a "U" shape with the legs of the U projecting upwardly around the conductor rod.

17. A process as described in claim 14 whereby the step of providing said ceramic electrode body includes providing a body having a portion for attachment to the strap, said body portion having a free metal or metal alloy therein.

18. A process as described in claim 17 whereby said step of providing attaching means is providing a metal bond connection.

19. A process as described in claim 17 whereby said step of providing attaching means is providing a weld.

20. A process as described in claim 17 whereby the step of providing a body having a portion for attachment to the strap includes providing a chemically reduced portion of said ceramic body.

21. A process as described in claim 17 whereby the step of providing a body portion having a free metal or metal alloy therein includes providing a free metal or metal alloy selected from the group consisting of Fe, Ni, Al, Mg, Ca, Co, Sn, Ti, Cr, Mn, Zr, Cu, Nb, Ta, Li, Y, Pt, Pd and Ir.

22. A process as described in claim 17 whereby the step of providing said ceramic electrode body includes providing a ceramic electrode body having at least one metal oxide therein.

23. A process as described in claim 22 whereby the step of providing a ceramic electrode body having at least one metal oxide therein includes providing a body portion having a chemically reduced portion of said ceramic electrode body.

24. A process as described in claim 14 whereby the step of providing a ceramic body includes providing a ceramic electrode body having at least one metal compound comprised of at least two metal oxides.

25. A process as described in claim 24 whereby the step of providing a ceramic electrode body having at least one metal compound comprised of two metal oxides includes providing a ceramic electrode body having a chemically reduced portion.