Apparatus and methods for purifying lead

Patent metadata

Field	Value
Publication number	US-9234258-B2
Application number	US-201414182788-A
Country	US
Kind code	B2
Filing date	Feb 18, 2014
Priority date	Feb 25, 2013
Publication date	Jan 12, 2016
Grant date	Jan 12, 2016

Abstract

Disclosed is an exemplary method of purifying lead which includes the steps of placing lead and a fluoride salt blend in a container; forming a first fluid of molten lead at a first temperature; forming a second fluid of the molten fluoride salt blend at a second temperature higher than the first temperature; mixing the first fluid and the second fluid together; separating the two fluids; solidifying the molten fluoride salt blend at a temperature above a melting point of the lead; and removing the molten lead from the container. In certain exemplary methods the molten lead is removed from the container by decanting. In still other exemplary methods the molten salt blend is a Lewis base fluoride eutectic salt blend, and in yet other exemplary methods the molten salt blend contains sodium fluoride, lithium fluoride, and potassium fluoride.

First claim

The invention claimed is:

1. A coolant purification device, comprising:
a container thermally connected with a heat source;
an inlet configured to disperse molten lead into a first end of the container;
a molten fluoride salt blend within the container interior;
an outlet configured to discharge the molten lead from a second end of the container; and
a tortuous path passing through the molten salt blend and connecting the inlet to the outlet,
wherein the container is configured such that the molten salt blend flows in a countercurrent direction relative to a direction of the molten lead flow.

2. The coolant purification device of claim 1 , wherein the inlet is configured to disperse the molten lead into the first end of the container as lead droplets.

3. The coolant purification device of claim 1 , wherein the molten salt blend is a Lewis base fluoride eutectic salt blend.

4. The coolant purification device of claim 3 , wherein the molten salt blend comprises at least three salts selected from the group consisting of lithium fluoride, calcium fluoride, magnesium fluoride, potassium fluoride, and sodium fluoride.

5. The coolant purification device of claim 3 , wherein the molten salt blend contains sodium fluoride, lithium fluoride, and potassium fluoride.

6. The coolant purification device of claim 5 , wherein the sodium fluoride, lithium fluoride, and potassium fluoride are in a molar percentage blend of 47%, 11%, and 42% respectively.

7. A method of purifying lead, comprising:
thermally connecting a container with a heat source;
filling at least a portion of the container with a molten fluoride salt blend;
dispersing molten lead into a first end of the container;
passing the molten lead along a tortuous path through the molten fluoride salt blend; and
collecting the molten lead.

8. The method of claim 7 , further comprising the step of dispersing the molten lead into the first end of the container as lead droplets.

9. The method of claim 7 , further comprising the step of collecting the molten lead from a second end of the container.

10. The method of claim 7 , wherein the molten salt blend is a Lewis base fluoride eutectic salt blend.

11. The method of claim 10 , wherein the molten salt blend comprises at least three salts selected from the group consisting of lithium fluoride, calcium fluoride, magnesium fluoride, potassium fluoride, and sodium fluoride.

12. The method of claim 10 , wherein the molten salt blend contains sodium fluoride, lithium fluoride, and potassium fluoride.

13. The method of claim 12 , wherein the sodium fluoride, lithium fluoride, and potassium fluoride are in a molar percentage blend of 47%, 11%, and 42% respectively.

14. A method of purifying lead, comprising:
placing lead and a fluoride salt blend in a container;
forming a first fluid of molten lead at a first temperature;
forming a second fluid of molten fluoride salt blend at a second temperature higher than the first temperature;
mixing the first fluid and the second fluid together;
separating the mixed fluids;
solidifying the molten fluoride salt blend at a temperature above a melting point of the lead; and
removing the molten lead from the container.

15. The method of claim 14 , further comprising the step of placing the container in an inert atmosphere.

16. The method of claim 14 , wherein the molten salt blend is a Lewis base fluoride eutectic salt blend.

17. The method of claim 16 , wherein the molten salt blend comprises at least three salts selected from the group consisting of lithium fluoride, calcium fluoride, magnesium fluoride, potassium fluoride, and sodium fluoride.

18. The method of claim 17 , wherein the molten salt blend contains sodium fluoride, lithium fluoride, and potassium fluoride.

19. The method of claim 18 , wherein the sodium fluoride, lithium fluoride, and potassium fluoride are in a molar percentage blend of 47%, 11%, and 42% respectively.

Assignees

• Us Energy
• Us Dept Energy

Inventors

• Tunison Harmon M

Classifications

• C22B13/02

  by dry processes · CPC title

• G21F9/308

  by melting the waste (G21F9/305, G21F9/32 take precedence) · CPC title

• C22B9/106

  the refining being obtained by intimately mixing the molten metal with a molten salt or slag · CPC title

• C22B9/103

  Methods of introduction of solid or liquid refining or fluxing agents · CPC title

• C22B13/025

  Recovery from waste materials · CPC title