US4163664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for precipitating precious metals from solutions which contain them
Assignee: Protec Processi e Technologie SpA
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Filing: 1978-01-04
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Granted: 1979-08-07
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Expires: 1998-01-04
Abstract
Abstract Process for the practically total precipitation of precious metals from solutions which contain them, according to which said solutions are treated with carbon monoxide in the presence of a quantity of water or a primary or secondary alcohol at least equal in weight to the total quantity of precious metal present.
Inventors
- 👤 Renato Ugo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:23
CPC Classifications
C; C01; C01G; C01G5/00; C01G5/003; C01G55/00; C01G55/001; C01G7/00; C01G7/003; C22; C22B; C22B11/00; C22B11/04; C22B3/00; C22B3/20; C22B3/26; C22B3/262; C22B3/44; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
A process for the substantially total precipitation of precious metal selected from the group consisting of platinum, palladium, gold, silver, ruthenium, rhodium, osmium and iridium from a solution containing the ions thereof in a concentration of less than 10 ppm, which comprises treating said solution with carbon monoxide at a pH between 0 and 7, at a temperature between 20° and 200° C. and at a carbon monoxide pressure between 1 and 100 atmospheres in the presence of a quantity of water or a primary or secondary alcohol at least equal in weight to the total quantity of precious metals present, until the amount of metals remaining in solution is less than 1 ppm.
Claim 2
Dependent Claim
114 words
A process for the substantially total precipitation of precious metal selected from the group consisting of platinum, palladium, gold, silver, ruthenium, rhodium, osmium and iridium from a solution containing the ions thereof in a concentration of less than 10 ppm, which comprises treating said solution with carbon monoxide at a pH between 0 and 7, at a temperature between 20° and 200° C. and at a carbon monoxide pressure between 1 and 100 atmospheres in the presence of a quantity of water or a primary or secondary alcohol at least equal in weight to the total quantity of precious metals present, until the amount of metals remaining in solution is less than 1 ppm.
Claim 3
Dependent Claim
15 words
A process according to claim 1, wherein treatment is conducted in the presence of water.
Claim 4
Dependent Claim
17 words
A process according to claim 1 wherein treatment is conducted in the presence of a secondary alcohol.
Claim 5
Dependent Claim
98 words
A process for a substantially total precipitation of platinum, palladium, ruthenium, rhodium, osmium and iridium from a solution containing ions thereof, which comprises treating said solution with carbon monoxide in the presence of a quantity of water or a primary or a secondary alcohol at least equal in weight to the total quantity of metals present in solution at a pH between 0 and 7, at a temperature between 20° C. and 200° C., and at a carbon monoxide pressure between 1 and 100 atmospheres, until the amount of metals remaining in solution is less than 1 ppm.
Claim 6
Dependent Claim
98 words
A process for a substantially total precipitation of platinum, palladium, ruthenium, rhodium, osmium and iridium from a solution containing ions thereof, which comprises treating said solution with carbon monoxide in the presence of a quantity of water or a primary or a secondary alcohol at least equal in weight to the total quantity of metals present in solution at a pH between 0 and 7, at a temperature between 20° C. and 200° C., and at a carbon monoxide pressure between 1 and 100 atmospheres, until the amount of metals remaining in solution is less than 1 ppm.
Claim 7
Dependent Claim
16 words
A process according to claim 4 wherein the process is conducted in the presence of water.
Claim 8
Dependent Claim
18 words
A process according to claim 4 wherein the process is conducted in the presence of a secondary alcohol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-06 | 1983-02-05 | 1983-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-06 | 1987-02-05 | 1987-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-06 | 1991-02-05 | 1991-08-07 | $7700.00 | Window Closed / Lapsed |