# US 10,246,760 B2 · Platinum recovery methods

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- Number: US 10,246,760 B2
- Document ID: US10246760B2
- Status: Granted
- Kind: B2
- Application number: 15/208,030
- Filed: 2016-07-12
- Published: 2018-01-18
- Granted: 2019-04-02
- Earliest claimed: 2016-07-12
- Assignees: General Electric Company
- Applicants: General Electric Company
- Inventors: Lawrence B. Kool; Genfa Hu
- Web page: https://patentgrep.com/patent/US10246760B2

## CPC

- C22B 11/046: {from manufactured products, e.g. from printed circuit boards, from photographic films, paper or baths}
- C22B 7/007: {by acid leaching}
- Y02P 10/20: Recycling
- C22B: PRODUCTION AND REFINING OF METALS (electrolytic C25); PRETREATMENT OF RAW MATERIALS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present invention is directed to a method for recovery of platinum from a coating on a component, wherein the coating includes platinum aluminide, the method including: contacting the coating on the component with a reagent solution, the reagent solution including a reactive species capable of solubilizing an aluminum salt in water, which results in formation of a platinum-rich residue on the component; separating the platinum-rich residue from the component; and collecting the platinum-rich residue. The reactive species may be hexafluorosilicic acid.

## Claims

### Claim 1

A method for recovery of platinum from a coating on a component, wherein the coating comprises platinum aluminide, the method comprising:
contacting the coating on the component with a reagent solution, the reagent solution comprising hexafluorosilicic acid, whereby a platinum-rich residue is formed on the component;
separating the platinum-rich residue from the component; and
collecting the platinum-rich residue.

### Claim 2 (depends on 1)

The method of claim 1, wherein hexafluorosilicic acid concentration in the reagent solution is from about 10 percent to about 35 percent by weight.

### Claim 3 (depends on 1)

The method of claim 1, wherein the platinum-rich residue has a platinum content of from about 5 to about 70 percent by weight.

### Claim 4 (depends on 1)

The method of claim 1, wherein contacting the coating on the component with the reagent solution comprises immersing the component in the reagent solution.

### Claim 5 (depends on 1)

The method of claim 1, wherein, subsequently to contacting of the coating on the component with the reagent solution, the reagent solution is heated or cooled.

### Claim 6 (depends on 1)

The method of claim 1, wherein separating the platinum-rich residue from the component comprises applying a mechanical force to the platinum-rich residue on the component, the mechanical force comprising brushing, water jet cleaning, dry-ice blasting, compressed air cleaning, stirring, sparging, ultrasound agitation, vibratory tumbling, or combinations thereof.

### Claim 7 (depends on 6)

The method of claim 6, wherein the mechanical force comprises vibratory tumbling with tumbling media.

### Claim 8 (depends on 1)

The method of claim 1, wherein collecting the platinum-rich residue comprises centrifugation.

### Claim 9 (depends on 1)

The method of claim 1, further comprising drying of the platinum rich residue.

### Claim 10

A method for recovery of platinum from a coating on a component, wherein the coating comprises platinum aluminide, the method comprising:
contacting the coating on the component with a reagent solution by immersing the component in the reagent solution, the reagent solution comprising hexafluorosilicic acid, whereby a platinum-rich residue is formed on the component;
separating the platinum-rich residue from the component by vibratory tumbling of the component;
collecting the platinum-rich residue by centrifugation; and
drying the platinum-rich residue.

### Claim 11 (depends on 10)

The method of claim 10, wherein hexafluorosilicic acid concentration in the reagent solution is from about 10 percent to about 35 percent by weight.

### Claim 12 (depends on 10)

The method of claim 10, wherein the platinum-rich residue has a platinum content of from about 5 to about 70 percent by weight.

### Claim 13 (depends on 10)

The method of claim 10, wherein, subsequently to contacting of the coating with the reagent solution, the reagent solution is heated or cooled.

### Claim 14 (depends on 10)

The method of claim 10, wherein vibratory tumbling of the component includes use of tumbling media.

### Claim 15

A method for recovery of platinum from a coating on a component, wherein the coating comprises platinum aluminide, the method comprising:
contacting the coating on the component with a reagent solution, the reagent solution comprising a reactive species, wherein the reactive species is capable of solubilizing an aluminum salt in water, whereby a platinum-rich residue is formed on the component;
separating the platinum-rich residue from the component; and
collecting the platinum-rich residue.

### Claim 16 (depends on 15)

The method of claim 15, wherein the reactive species is selected from the group consisting of hexafluorosilicic acid, hydrofluoric acid, lactic acid, nitric acid, sulfuric acid, caustic soda, hexafluorozirconic acid, hexafluorotitanic acid, methane sulfonic acid, ammonium bifluoride, and mixtures thereof.

### Claim 17 (depends on 15)

The method of claim 15, wherein concentration of the reactive species in the reagent solution is from about 10 percent to about 100 percent by weight.

### Claim 18 (depends on 15)

The method of claim 15, wherein the reactive species is hexafluorosilicic acid.

### Claim 19 (depends on 15)

The method of claim 15, wherein the platinum-rich residue has a platinum content of from about 5 to about 70 percent by weight.

### Claim 20 (depends on 15)

The method of claim 15, wherein contacting the coating on the component with the reagent solution comprises immersing the component in the reagent solution.

### Claim 21 (depends on 15)

The method of claim 15, wherein, subsequently to contacting of the coating on the component with the reagent solution, the reagent solution is heated or cooled.

### Claim 22 (depends on 15)

The method of claim 15, wherein separating the platinum-rich residue from the component comprises applying a mechanical force to the platinum-rich residue on the component, the mechanical force comprising brushing, water jet cleaning, dry-ice blasting, compressed air cleaning, stirring, sparging, ultrasound agitation, vibratory tumbling, or combinations thereof.

### Claim 23 (depends on 22)

The method of claim 22, wherein the mechanical force comprises vibratory tumbling with tumbling media.

### Claim 24 (depends on 15)

The method of claim 15, wherein collecting the platinum-rich residue comprises centrifugation.

### Claim 25 (depends on 15)

The method of claim 15, further comprising drying of the platinum rich residue.

### Claim 26

A method for recovery of platinum from a coating on a component, wherein the coating comprises platinum aluminide, the method comprising:
contacting the coating on the component with a reagent solution by immersing the component in the reagent solution, the reagent solution comprising a reactive species, wherein the reactive species is capable of solubilizing an aluminum salt in water, whereby a platinum-rich residue is formed on the component;
separating the platinum-rich residue from the component by vibratory tumbling of the component;
collecting the platinum-rich residue by centrifugation; and
drying the platinum-rich residue.

### Claim 27 (depends on 26)

The method of claim 26, wherein the reactive species is selected from the group consisting of hexafluorosilicic acid, hydrofluoric acid, lactic acid, nitric acid, sulfuric acid, caustic soda, hexafluorozirconic acid, hexafluorotitanic acid, methane sulfonic acid, ammonium bifluoride, and mixtures thereof.

### Claim 28 (depends on 26)

The method of claim 26, wherein concentration of the reactive species in the reagent solution is from about 10 percent to about 100 percent by weight.

### Claim 29 (depends on 26)

The method of claim 26, wherein the reactive species is hexafluorosilicic acid.

### Claim 30 (depends on 26)

The method of claim 26, wherein the platinum-rich residue has a platinum content of from about 5 to about 70 percent by weight.

### Claim 31 (depends on 26)

The method of claim 26, wherein, subsequently to contacting of the coating with the reagent solution, the reagent solution is heated or cooled.

### Claim 32 (depends on 26)

The method of claim 26, wherein vibratory tumbling of the component includes use of tumbling media.