Patent US3935006A successfully refreshed from Google Patents.
US3935006A
Expired / Lapsed
US
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Process for eluting adsorbed gold and/or silver values from activated carbon
Assignee: United States Department of the Interior
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Filing: 1975-03-19
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Granted: 1976-01-27
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Expires: 1995-03-19
Abstract
Abstract A process is disclosed which is directed to recovering gold and/or silver values from activated carbon, wherein gold and/or silver has been adsorbed thereon. The process comprises eluting the activated carbon with water soluble alcohols or ketones either alone or with aqueous solutions thereof and a strong base may be added to further facilitate elution.
Inventors
- 👤 Dennis D. Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:21
CPC Classifications
C; C01; C01G; C01G7/00; C01G7/003; C01G5/00; C01G5/003; C22; C22B; C22B11/00; C22B11/04; C22B3/00; C22B3/20; C22B3/22; C22B3/24; C22B3/26; C22B3/262; C22B3/306; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
70 words
A process for recovering gold and/or silver values from activiated carbon with gold and/or silver values adsorbed thereon, comprising eluting said activated carbon with an eluent selected from the group consisting of water soluble alcohols, solutions of water soluble alcohols and a strong base, aqueous solutions of water soluble alcohols, aqueous solutions of water soluble alcohols and a strong base, water soluble ketones and aqueous solutions of water soluble ketones.
Claim 2
Dependent Claim
70 words
A process for recovering gold and/or silver values from activiated carbon with gold and/or silver values adsorbed thereon, comprising eluting said activated carbon with an eluent selected from the group consisting of water soluble alcohols, solutions of water soluble alcohols and a strong base, aqueous solutions of water soluble alcohols, aqueous solutions of water soluble alcohols and a strong base, water soluble ketones and aqueous solutions of water soluble ketones.
Claim 3
Dependent Claim
25 words
The process as defined in claim 1, wherein said eluent containg strong base comprises at least 0.1 grams of sodium hydroxide per liter of eluent.
Claim 4
Dependent Claim
31 words
The process as defined in claim 1, wherein said eluent comprises about 0 to 60%, by volume, of water and about 40 to 100%, by volume, of a water soluble alcohol.
Claim 5
Dependent Claim
24 words
The process as defined in claim 1, wherein said eluent comprises a water soluble alcohol selected from the group consisting of methanol and ethanol.
Claim 6
Dependent Claim
12 words
The process as defined in claim 1, wherein said eluent is acetone.
Claim 7
Dependent Claim
16 words
The process as defined in claim 1, wherein said strong base is an alkali metal hydroxide.
Claim 8
Dependent Claim
15 words
The process as defined by claim 6, wherein said alkali metal hydroxide is sodium hydroxide.
Claim 9
Dependent Claim
15 words
The process as defined by claim 1, wherein said alkali metal hydroxide is potassium hydroxide.
Claim 10
Dependent Claim
49 words
The process as defined by claim 1, wherein said eluent comprises between about 0 to 60%, by volume of water, about 40 to 100% of a water soluble alcohol selected from the group consisting of methanol and ethanol, and at least 0.1 gram sodium hydroxide per liter of eluent.
Claim 11
Dependent Claim
38 words
The process as defined as claim 1, wherein said eluent comprises between about 0 to 254% by volume of water, about 75 to 100% of methanol and at least 1.0 gram of sodium hydroxide per liter of eluent.
Claim 12
Dependent Claim
22 words
The process as defined by claim 1, wherein said activated carbon has gold and/or silver values adsorbed thereon from a cyanidation pulp.
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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) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |