US4018595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of copper by gaseous reduction
Assignee: Viridian Inc Canada
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Filing: 1975-11-28
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Granted: 1977-04-19
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Expires: 1995-11-28
Abstract
Abstract An improvement in the process of producing substantially oxide free copper from copper salts by reacting an acidic aqueous solution which contains the copper salts with a reducing gas at elevated temperature and pressure to precipitate metallic copper. The improvement for producing copper in free-flowing powder form comprises providing in the aqueous solution a finite amount of an addition agent selected from the group consisting of polymeric polyamine compounds having amino groups linked by alkyl groups having 2 to 4 carbon atoms.
Inventors
- 👤 Roman Michael Genik-Sas-Berezowsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:34
CPC Classifications
C; C22; C22B; C22B5/00; C22B5/02; C22B5/12; B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/24; B22F9/26; C22B15/00; C22B15/0063; C22B15/0084; C22B15/0089; C22B15/0093; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
In combination with the process of producing substantially oxide free copper in powder form from copper salts by reacting an acidic aqueous solution which contains said copper salts with a reducing gas at elevated temperature and pressure to precipitate metallic copper, the improvement, which comprises providing in said aqueous solution a finite amount of an addition agent selected from the group consisting of polymeric polyamine compounds having amino group linked by alkyl groups having 2 to 4 carbon atoms.
Claim 2
Dependent Claim
79 words
In combination with the process of producing substantially oxide free copper in powder form from copper salts by reacting an acidic aqueous solution which contains said copper salts with a reducing gas at elevated temperature and pressure to precipitate metallic copper, the improvement, which comprises providing in said aqueous solution a finite amount of an addition agent selected from the group consisting of polymeric polyamine compounds having amino group linked by alkyl groups having 2 to 4 carbon atoms.
Claim 3
Dependent Claim
29 words
The process according to claim 1 in which said addition agent is a highly branched polyethylenimine polymer having a molecular weight in the range of 40,000 to about 100,000.
Claim 4
Dependent Claim
28 words
The process according to claim 2 in which the addition agent is present in the system subjected to treatment in amount between about 100 and about 200 ppm.
Claim 5
Dependent Claim
16 words
The process according to claim 1 in which said solution is an acid copper sulphate solution.
Claim 6
Dependent Claim
20 words
The process according to claim 1 wherein said solution is an acid copper sulphate solution which also contains ammonium sulphate.
Claim 7
Dependent Claim
58 words
The process according to claim 1 in which said reduction reaction is carried out on a continuous basis with preheated copper bearing aqueous solution being fed into a reaction vessel and copper powder and treated solution being discharged from said reaction vessel whilst conditions for reduction of copper from said solution are continuously maintained in said reaction vessel.
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) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |