Recovery and recycling of byproducts of activated aluminum

Patent metadata

Field	Value
Publication number	US-11958045-B2
Application number	US-202217705175-A
Country	US
Kind code	B2
Filing date	Mar 25, 2022
Priority date	Mar 26, 2021
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

Methods, systems, and compositions related to the recycling and/or recovery of activating materials from activated aluminum are disclosed. In one embodiment, an aqueous solution's composition may be controlled to maintain aluminum ions dissolved in solution during reaction of an activated aluminum. In another embodiment, aluminum hydroxide containing the activating materials may be dissolved into an aqueous solution to isolate the activating materials.

First claim

The invention claimed is:

1. A method of recovering one or more activating materials, the method comprising:
adding a composition comprising aluminum hydroxide and the one or more activating materials to an aqueous solution, wherein the one or more activating materials includes at least one selected from the group of indium and gallium;
dissolving the aluminum hydroxide to form aluminum ions and hydroxide ions dissolved in the aqueous solution; and
forming a separate phase comprising the activating materials.

2. The method of claim 1 , further comprising controlling a composition of the aqueous solution to maintain the aluminum ions dissolved in the aqueous solution.

3. The method of claim 1 , further comprising combining at least two separate phases comprising the activating materials into a mass.

4. The method of claim 1 , further comprising maintaining a pH of the aqueous solution to be greater than or equal to 2.5 and less than or equal to 8.

5. The method of claim 1 , further comprising maintaining a pH of the aqueous solution to be less than 7.

6. The method of claim 1 , wherein the aqueous solution includes a chelating agent.

7. The method claim 6 , wherein the chelating agent is at least one selected from the group of citrate and oxalate.

8. The method of claim 6 , wherein the chelating agent is at least bidentate.

9. The method of claim 6 , wherein the chelating agent is at least tridentate.

10. The method of claim 1 , further comprising precipitating aluminum hydroxide.

11. The method of claim 10 , wherein precipitating aluminum hydroxide precipitates a reformed aluminum hydroxide, wherein the reformed aluminum hydroxide does not comprise the one or more activating materials.

12. The method of claim 1 , further comprising combining at least two separate phases comprising activating materials into a mass comprising gallium and/or indium.

13. The method of claim 12 , wherein a mass ratio of indium and gallium is greater than or equal to 1.

14. The method of claim 12 , wherein a wt % of the gallium and/or indium relative to the aluminum is greater than or equal to 0.1 wt %.

15. The method of claim 1 , wherein the aqueous solution is an acidic aqueous solution.

Assignees

• Massachusetts Inst Technology

Inventors

• Kelley Jude
• Morgan Eric
• Kunz Roderick Russell

Classifications

• B01J38/68 Primary

  including substantial dissolution or chemical precipitation of a catalyst component in the ultimate reconstitution of the catalyst · CPC title

• B01J23/08

  of gallium, indium or thallium · CPC title

• B01J23/94

  of catalysts comprising metals, oxides or hydroxides of the iron group metals or copper · CPC title

• B01J38/64

  using alkaline material; using salts · CPC title

• B01J2523/31

  Aluminium · CPC title