Method for reclaiming lead

• US 8,105,416 B1
• Filed: 05/05/2010
• Issued: 01/31/2012
• Est. Priority Date: 05/05/2010
• Status: Active Grant

• Current Assignee: MPT Group LLC
• Original Assignee: Stannum Group LLC (Stannum International LLC)
• Inventors: Schulz, Jerry D., Seebeck, Robert E., Eagan, Lawrence G.
• Primary Examiner(s): King, Roy
• Assistant Examiner(s): McGuthry Banks, Tima M
• Application Number:
  US12/774,220
• Time in Patent Office: 636 Days
• Field of Search: 756/97, 757/01, 757/02
• US Class Current: 75/697
• CPC Class Codes: C22B 13/025 Recovery from waste materials
• CPC Class Codes: C22B 13/06 Refining
• CPC Class Codes: Y02P 10/20 Recycling

Abstract

A method for reducing tin in lead bullion has the steps of adding an Arrhenius base to a kettle containing lead bullion and tin, adding a byproduct of conventional detinning to the kettle, agitating contents of the kettle, and removing a layer of slag from the kettle. The disclosed method removes tin via chemical oxidation, adds lead via chemical reduction of an oxide from the byproduct of conventional detinning, and preserves most of the antimony content of the lead bullion.

Claims

1. A method comprising:

a. adding an Arrhenius base to a kettle containing lead bullion and tin;

b. adding a byproduct of conventional detinning to the kettle;

c. agitating contents of the kettle; and

d. removing a layer of slag from the kettle, wherein the method reduces the amount of tin via chemical oxidation in the lead bullion.

2. The method of claim 1, further comprising:

e. measuring how much tin remains in the lead bullion;

f. repeating steps a-d until desired amount of tin is removed from the lead bullion.

3. The method of claim 1, further comprising:

g. adjusting the kettle temperature to about 413-468°

C.

4. The method of claim 1, wherein the byproduct of conventional detinning is tin dross.

5. The method of claim 1, wherein the byproduct of conventional detinning is bag house dust.

6. The method of claim 1, wherein the Arrhenius base is sodium hydroxide.

7. The method of claim 6, wherein about 3.8-4.1 kilograms of sodium hydroxide is added to the kettle per kilogram of tin in the kettle.

8. The method of claim 1, wherein the byproduct of conventional detinning is added incrementally to the kettle.

9. The method of claim 1, wherein the Arrhenius base is added incrementally to the kettle.

10. The method of claim 1, wherein the method achieves an increase of about 3% lead in the kettle.

11. A method comprising:

a. adjusting a kettle temperature to about 413-468°

C., the kettle containing lead bullion and tin;

b. adding sodium hydroxide into the kettle;

c. adding tin dross into the kettle;

d. agitating components in the kettle; and

e. removing a layer of slag from the kettle, wherein the method reduces tin via chemical oxidation and adds lead via chemical reduction to the lead bullion in the kettle.

12. The method of claim 11, further comprising:

f. measuring how much tin remains in the kettle;

g. repeating steps a-e until a desired amount of tin is removed from the lead bullion.

13. The method of claim 11, wherein the ratio of sodium hydroxide to tin dross is about 1.025.

14. The method of claim 11, wherein step b comprises adding about 4.1 kilograms of sodium hydroxide per kilogram of tin remaining in the kettle.

15. The method of claim 11, wherein step c comprises adding about 4 kilograms of tin dross per kilogram of tin remaining in the kettle.

16. A method comprising:

a. adjusting a kettle temperature to about 413-468°

C., the kettle containing lead bullion and tin;

b. adding sodium hydroxide into the kettle;

c. adding bag house dust into the kettle;

d. agitating components in the kettle; and

e. removing a layer of slag from the kettle, wherein the method reduces tin via chemical oxidation and adds lead via chemical reduction to the lead bullion in the kettle.

17. The method of claim 16, further comprising:

f. measuring how much tin remains in the kettle;

g. repeating steps a-e until desired amount of tin is removed from the lead bullion.

18. The method of claim 16, wherein the ratio of bag house dust to sodium hydroxide is about 1.1.

19. The method of claim 16, wherein step b comprises adding about 3.8 kilograms of sodium hydroxide per kilogram of tin remaining in the kettle.

20. The method of claim 16, wherein step c comprises adding about 3.9-4.5 kilograms of bag house dust per kilogram of tin remaining in the kettle.