Method for producing a non-radioactive product from a radioactive waste

• US 5,489,734 A
• Filed: 04/12/1993
• Issued: 02/06/1996
• Est. Priority Date: 11/07/1991
• Status: Expired due to Term

• Current Assignee: Quantum Catalytics LLC
• Original Assignee: Molten Metal Technology Incorporated
• Inventors: Nagel, Christopher J., Bach, Robert D.
• Primary Examiner(s): MAI, NGOCLAN THI
• Application Number:
  US08/046,016
• Time in Patent Office: 1,030 Days
• Field of Search: 252/626, 423/2, 588/201, 588/1
• US Class Current: 588/1
• CPC Class Codes: C22B 60/02 Obtaining thorium, uranium, or other actinides
• CPC Class Codes: C22B 60/0213 by dry processes
• CPC Class Codes: C22B 7/002 by treating with halogens, sulfur or compounds thereof; by carburising, by treating with hydrogen (hydriding)
• CPC Class Codes: Y02P 10/20 Recycling

Abstract

A method is disclosed for producing a non-radioactive product from a radioactive waste composition that includes a radioactive component and a non-radioactive component. The method includes directing the radioactive waste into a molten metal bath. A separation agent is directed in the molten metal bath which reacts with a component of the radioactive waste composition to form a reaction product which separates from the remaining component, thereby forming a non-radioactive product. The separation reagent can be, for example, an oxidant, a metal-ligand exchange reagent, or a reducing agent. The non-radioactive product can be a gas, a liquid, or a precipitate.

Claims

1. A method for producing a non-radioactive product from a radioactive waste composition that includes a radioactive component and a non-radioactive component, comprising the steps of:

(a) directing the radioactive waste into a molten metal bath; and

(b) directing a separation reagent into the molten metal bath which reacts with a component of the radioactive waste composition to form a radioactive reaction product that separates from the molten metal bath and from the non-radioactive component, thereby forming a non-radioactive product.

2. The method of claim 1 wherein the separation reagent causes the radioactive component to form a salt.

3. A method for producing a non-radioactive product from a radioactive waste composition that includes a radioactive component and a non-radioactive component, comprising the steps of:

(a) directing the radioactive waste into a molten metal bath; and

(b) directing a metal-ligand exchange reagent into the molten metal bath which reacts with a component of the radioactive waste composition to form a reaction product that separates from the molten metal bath and from the remaining component, thereby forming a non-radioactive product.

4. A method for producing a non-radioactive product from a radioactive waste composition that includes a radioactive component and a non-radioactive component, comprising the steps of:

(a) directing the radioactive waste into a molten metal bath; and

(b) directing a separation reagent into the molten metal bath which reacts with the non-radioactive component of the radioactive waste composition to form a reaction product that separates from the molten metal bath and from the remaining component, thereby forming a non-radioactive product.

5. A method of claim 4 wherein the separation reagent causes the non-radioactive component to separate from the molten metal bath and the radioactive component as a liquid which is substantially insoluble in the molten metal bath.

6. A method of claim 4 wherein the separation reagent causes the non-radioactive component to separate as a precipitate from the molten metal bath and from the radioactive component.

7. A method of claim 6 wherein the separation reagent causes the non-radioactive component to form a salt.

8. A method of claim 7 wherein the salt migrates from the bath to a vitreous layer above the molten metal bath.

9. A method of claim 6 wherein the separation reagent oxidizes the non-radioactive component.

10. A method of claim 9 wherein the non-radioactive product migrates from the bath to a vitreous layer above the molten metal bath.

11. A method of claim 10 wherein the separation reagent includes oxygen.

12. A method of claim 4 wherein the separation reagent causes the non-radioactive component to separate from the molten metal bath as a gas.

13. A method of claim 12 wherein separate reagent includes a halogen.

14. A method of claim 13 wherein the halogen is fluorine.

15. A method of claim 12 wherein the separation reagent includes oxygen.

16. A method of claim 15 wherein the non-radioactive component of the radioactive waste composition includes carbon and the non-radioactive reaction product includes a carbon oxide.

17. A method of claim 16 wherein the carbon oxide includes carbon monoxide.

18. A method of claim 16 wherein the carbon oxide includes carbon dioxide.

19. A method of claim 4 further including the step of directing a metal-ligand exchange reagent into the molten metal bath which reacts with the radioactive component to cause the radioactive component in the molten metal bath to volatilize.

20. A method for producing a non-radioactive product from a radioactive waste composition, comprising the steps of:

(a) directing a radioactive waste composition, which includes a non-radioactive component and more than one radioactive component, into a molten metal bath; and

(b) directing a separation reagent into the molten metal bath which reacts with a component of the radioactive waste composition to form a reaction product that separates from the molten metal bath and form the remaining components, thereby forming a non-radioactive product.

21. A method of claim 20 wherein a metal-ligand exchange reagent is directed into the molten metal bath, said metal-ligand exchange reagent reacting with less than all of the radioactive elements of the radioactive component, whereby the radioactive reaction product of the reaction with the metal-ligand exchange reagent volatilizes and separates from the remaining radioactive element.

22. A method of claim 21 wherein the non-radioactive component of the waste includes carbon.

23. A method of claim 22 wherein the non-radioactive component is oxidized by the separation reagent.

24. A method of claim 23 wherein the non-radioactive reaction product is a precipitate which migrates from the bath to a vitreous layer above the molten metal bath.

25. A method of claim 23 wherein the non-radioactive reaction product is a gas.

26. A method of claim 25 wherein the gas includes a carbon oxide.

27. A method of claim 26 wherein the carbon oxide includes carbon monoxide.

28. A method of claim 26 wherein the carbon oxide includes carbon dioxide.

29. A method of claim 21 wherein the non-radioactive component of the waste composition is an oxide which separates from the radioactive component of the radioactive composition in the molten metal bath by migrating from the molten metal bath to a vitreous layer formed above the molten metal bath.

30. A method of claim 29 wherein the separation reagent reacts with the remaining radioactive element in the molten metal bath to cause the radioactive element to separate from said molten metal bath.

31. A method for producing a non-radioactive product from a radioactive waste composition that includes a radioactive component and a non-radioactive component, comprising the steps of:

a) directing radioactive waste into a molten metal bath; and

b) directing a separation reagent into the molten metal bath which reacts with the radioactive component to form a radioactive reaction product that separates from the molten metal bath and from the remaining component, said remaining component thereby forming the non-radioactive product.

32. A method for producing a non-radioactive product from a radioactive waste composition that includes a radioactive component and a non-radioactive component, comprising the steps of:

a) directing the radioactive waste into a molten metal bath; and

b) directing a separation reagent into the molten metal bath which reacts with the non-radioactive component to form a non-radioactive product that separates from the molten metal bath and from the remaining radioactive component.

33. A method for producing a non-radioactive product from a radioactive waste composition that includes a radioactive component and a non-radioactive component, comprising the steps of:

a) directing the radioactive waste into a molten metal bath;

b) directing a separation reagent into the molten metal bath which reacts with the non-radioactive component to form a non-radioactive product that separates from the molten metal bath and from the remaining radioactive component; and

c) directing a metal-ligand exchange reagent into the molten metal bath which reacts with the radioactive component to form a radioactive reaction product, which separates from the molten metal bath.

34. A method for producing a non-radioactive product from a radioactive waste composition that includes a radioactive component and a non-radioactive component, comprising the steps of:

a) directing the radioactive waste into a molten metal bath;

b) directing a metal-ligand exchange reagent into the molten metal bath which reacts with the radioactive component to form a metal-ligand exchange reaction product that separates from the molten metal bath and from the remaining non-radioactive component; and

c) directing the separation reagent into the molten metal bath which reacts with the non-radioactive component to form a non-radioactive product that separates from the molten metal bath.

35. A method for producing a non-radioactive product from a radioactive waste composition that includes more than one radioactive component and a non-radioactive component, comprising the steps of:

a) directing the radioactive waste into a molten metal bath;

b) directing a separation reagent into the molten metal bath which reacts with the non-radioactive component of the radioactive waste composition to form a non-radioactive product that separates from the molten metal bath and from the remaining radioactive components; and

c) directing a metal-ligand exchange reagent into the molten metal bath which reacts with the radioactive components to form radioactive reaction products, at least one of which separates from the molten metal bath.

36. A method for separating a radioactive component from a waste composition that includes at least one radioactive component, comprising the steps of:

a) directing the waste composition into a molten metal bath; and

b) directing a separation reagent into the molten metal bath which reacts with the radioactive component of the waste composition to form a radioactive reaction product that separates from the molten metal bath and from at least one remaining component of the waste composition.

37. A method for separating a radioactive component from a waste composition that includes at least two radioactive components having different levels of radioactivity, comprising the steps of:

a) directing the waste composition into a molten metal bath; and

b) directing a separation reagent into the molten metal bath which reacts with less than all of the radioactive component, whereby a radioactive reaction product forms which separates from the molten metal bath and from at least one remaining radioactive component having a different level of radioactivity than that of the radioactive component which reacts with the separation reagent.

38. A method for producing a non-radioactive product from a radioactive waste composition that includes a radioactive component and a non-radioactive component, comprising the steps of:

a) directing the radioactive waste into a molten metal bath; and

b) directing a separation reagent into the molten metal bath which oxidizes the radioactive component of the radioactive waste composition to form a radioactive reaction product that separates from the molten metal bath and from the non-radioactive component, thereby forming a non-radioactive product.

39. A method of claim 38 wherein the separation reagent includes oxygen.

40. A method of claim 38 wherein the separate reagent includes at least one oxidized transition metal.

41. A method for producing a non-radioactive product from a radioactive waste composition that includes a radioactive component and a non-radioactive component, comprising the steps of:

a) directing the radioactive waste into a molten metal bath; and

b) directing a separation reagent into the molten metal bath which reacts with a component of the radioactive waste composition to form a radioactive reaction product that separates from the molten metal bath and from the non-radioactive component as a gas, thereby forming a non-radioactive product.

42. A method of claim 41 wherein the separation reagent includes a halogen.

43. A method of claim 42 wherein the halogen is fluorine.

44. A method for producing a non-radioactive product from a radioactive waste composition that includes a radioactive component and a non-radioactive component, comprising the steps of:

a) directing the radioactive waste into a molten metal bath; and

b) directing a separation reagent into the molten metal bath which reduces the radioactive component of the radioactive waste composition to form a radioactive reaction product that precipitates from the molten metal bath and from the non-radioactive component, thereby forming a non-radioactive product.

45. A method of claim 44 wherein the separation reagent includes carbon.

46. A method of claim 44 wherein the separate reagent includes at least one transition metal.