Patent US3920450A successfully refreshed from Google Patents.
US3920450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction of In and/or Ga
Assignee: Dowa Holdings Co Ltd
•
Filing: 1974-10-18
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Granted: 1975-11-18
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Expires: 1994-10-18
Abstract
Abstract A method of extracting metal values by contacting a solution containing at least one metal of gallium and indium with a cation exchange solvent of a tertiary saturated aliphatic acid dissolved in a water-insoluble diluent, which effects liquid-liquid extraction to extract the metal values from said solution, and then contacting the solvent containing the thus separated metal values with an aqueous phase of a mineral acid to recover the metal values selected from gallium and indium.
Inventors
- 👤 Tetsuo Katsura
- 👤 Hideki Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:50
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/32; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
76 words
A METHOD OF RECOVERING METAL VALUES FORM A SOLUTION CONTAINING AT LEAST ONE ELEMENT SELECTED FROM GALLIUM AND INDIUM, WHICH COMPRISES CONTACTING SAID SOLUTION WITH A CATION EXCHANGE SOLVENT OF A TERTIARY SATURATED ALIPHATIC ACID DISSOLVED IN A WATER-INSOLUBLE DILUENT TO EXTRACT THE ELEMENT INTO THE ORGANIC SOLVENT, SEPARATING THE ORGANIC SOLVENT FROM THE RESULTING EXTRACTION MIXTUREM AND CONTACTING THE SEPARATED ORGANIC SOLVENT WITH AN AQUEOUS SOLUTION OF A MINERAL ACID TO EXTRACT THE ELEMENT THEREFROM.
Claim 2
Independent Claim
76 words
A METHOD OF RECOVERING METAL VALUES FORM A SOLUTION CONTAINING AT LEAST ONE ELEMENT SELECTED FROM GALLIUM AND INDIUM, WHICH COMPRISES CONTACTING SAID SOLUTION WITH A CATION EXCHANGE SOLVENT OF A TERTIARY SATURATED ALIPHATIC ACID DISSOLVED IN A WATER-INSOLUBLE DILUENT TO EXTRACT THE ELEMENT INTO THE ORGANIC SOLVENT, SEPARATING THE ORGANIC SOLVENT FROM THE RESULTING EXTRACTION MIXTUREM AND CONTACTING THE SEPARATED ORGANIC SOLVENT WITH AN AQUEOUS SOLUTION OF A MINERAL ACID TO EXTRACT THE ELEMENT THEREFROM.
Claim 3
Dependent Claim
40 words
The method of claim 1, in which said solution contains gallium and indium, and the extraction of gallium and indium with the cation exchange solvent is carried out at a pH value in the range of from 2.5 to 4.0.
Claim 4
Dependent Claim
39 words
The method of claim 1, in which said solution contains gallium but not indium, and the extraction of gallium with the cation exchange solvent is carried out at a pH value in the range of from 1.5 to 5.0.
Claim 5
Dependent Claim
39 words
The method of claim 1, in which said solution contains indium but not gallium, and the extraction of indium with the cation exchange solvent is carried out at a pH value in the range of from 1.0 to 5.0.
Claim 6
Dependent Claim
20 words
The method of claim 1, in which the tertiary saturated aliphatic acid is selected from compounds represented by the formula:
Claim 7
Dependent Claim
21 words
The method of claim 1, in which the water-insoluble diluent is selected from the group of a xylene and a kerosene.
Claim 8
Dependent Claim
37 words
The method of claim 1, in which prior to the solvent extraction with the cation exchange solvent, sodium hydrogensulfite is added to said solution containing said element or elements and arsenic to inhibit the precipitation of arsenite.
Claim 9
Independent Claim
126 words
A method of recovering gallium and indium, in which a solution containing gallium and indium is contacted with a cation exchange solvent of a tertiary saturated aliphatic acid dissolved in a waterinsoluble diluent to extract the gallium and indium into the organic solvent, separating the organic solvent from the resulting extraction mixture, contacting the separated organic solvent containing the gallium and indium with an aqueous dilute solution of a mineral acid to extract the gallium and indium into the mineral acid solution, contacting the resulting mineral acid solution containing gallium and indium with isopropyl ether to extract gallium from the resulting mineral acid solution, and contacting the remaining mineral acid solution containing indium with tributyl phosphate to extract the indium from said remaining mineral acid solution.
Claim 10
Independent Claim
126 words
A method of recovering gallium and indium, in which a solution containing gallium and indium is contacted with a cation exchange solvent of a tertiary saturated aliphatic acid dissolved in a waterinsoluble diluent to extract the gallium and indium into the organic solvent, separating the organic solvent from the resulting extraction mixture, contacting the separated organic solvent containing the gallium and indium with an aqueous dilute solution of a mineral acid to extract the gallium and indium into the mineral acid solution, contacting the resulting mineral acid solution containing gallium and indium with isopropyl ether to extract gallium from the resulting mineral acid solution, and contacting the remaining mineral acid solution containing indium with tributyl phosphate to extract the indium from said remaining mineral acid solution.
Claim 11
Dependent Claim
33 words
The method of claim 8, in which the extraction of gallium and indium with the cation exchange solvent is carried out at a pH value in the range of from 2.5 to 4.0.
Claim 12
Dependent Claim
20 words
The method of Claim 8, in which the tertiary saturated aliphatic acid is selected from compounds represented by the formula:
Claim 13
Dependent Claim
21 words
The method of claim 8, in which the water-insoluble diluent is selected from the group of a xylene and a kerosene.
Claim 14
Dependent Claim
35 words
The method of claim 8, in which prior to the solvent extraction with the cation exchange solvent, sodium hydrogensulfite is added to said solution containing galliUm, indium and arsenic to inhibit the precipitation of arsenite.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |