Patent US3874940A successfully refreshed from Google Patents.
US3874940A
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Cementation process
Assignee: DE AERO DEL PACIFICO Cia
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Filing: 1971-10-27
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Granted: 1975-04-01
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Expires: 1991-10-27
Abstract
Abstract Precipitation of a metal from a salt solution by a less electropositive metal is improved by carrying out the process with a specific ratio of available precipitant surface to concentration of the precipitating metal at all times, preferably under conditions of abrading agitation sufficient to maintain the precipitant surface clear of precipitated metal. The precipitant should have a high surface-to-volume ratio but sufficient size and size-distribution for good abrading action, and be continuously present in an amount of from several hundred to several thousand times the amount stoichiometrically required to react with the solution at a given time. With less agitation and abrasion, good results may still be obtained but the proportion of iron must be even higher. The cementation of copper on pig iron granules is described.
Inventors
- 👤 Carlos Molina Vera
- 👤 Carlos Vilches Guzman
- 👤 Luis Soto-Krebs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:56
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/20; C22B3/44; C22B15/00; C22B15/0063; C22B15/0084; C22B15/0089; C22B15/0091; C22B3/46; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
105 words
A PROCESS FOR THE CONTINUOUS PRECIPITATION OF COPPER FROM A HEAD SOLUTION THEREOF ONTO A METALLIC IRON PRECIPITANT COMPRISING: CHARGING SAID PRECIPITANT TO A REACTOR IN THE FORM OF GRANULATED PARTICLES OF SUBSTANTIALLY PLUS 10 MESH SIZE WHICH ARE SELF-ABRADING UNDER CONDITIONS OF AGITATION, SAID PRECIPITANT BEING PRESENT IN AN AMOUNT SUFFICIENT TO PROVIDE A REACTION INDEX OF AT LEAST 1; CONTINUOUSLY CHARGING SAID HEAD SOLUTION TO SAID REACTOR AND REMOVING SPENT SOLUTION AND PRECIPITATE; CONTINUOUSLY AGITATING SAID HEAD SOLUTION AND SAID PRECIPITANT TO PROMOTE SOLUTION-PRECIPITANT CONTACT AND SAID SELF-ABRASIVE; AND AT LEAST PERIODICALLY CHARGING ADDITIONAL PRECIPITANT TO SAID REACTOR TO MAINTAIN SAID REACTION INDEX.
Claim 2
Dependent Claim
105 words
A PROCESS FOR THE CONTINUOUS PRECIPITATION OF COPPER FROM A HEAD SOLUTION THEREOF ONTO A METALLIC IRON PRECIPITANT COMPRISING: CHARGING SAID PRECIPITANT TO A REACTOR IN THE FORM OF GRANULATED PARTICLES OF SUBSTANTIALLY PLUS 10 MESH SIZE WHICH ARE SELF-ABRADING UNDER CONDITIONS OF AGITATION, SAID PRECIPITANT BEING PRESENT IN AN AMOUNT SUFFICIENT TO PROVIDE A REACTION INDEX OF AT LEAST 1; CONTINUOUSLY CHARGING SAID HEAD SOLUTION TO SAID REACTOR AND REMOVING SPENT SOLUTION AND PRECIPITATE; CONTINUOUSLY AGITATING SAID HEAD SOLUTION AND SAID PRECIPITANT TO PROMOTE SOLUTION-PRECIPITANT CONTACT AND SAID SELF-ABRASIVE; AND AT LEAST PERIODICALLY CHARGING ADDITIONAL PRECIPITANT TO SAID REACTOR TO MAINTAIN SAID REACTION INDEX.
Claim 3
Dependent Claim
14 words
The process as claimed in claim 1, wherein said precipitant is a pig iron.
Claim 4
Dependent Claim
27 words
The process as claimed in claim 2, wherein said pig iron is in the form of granules of which at least 50 percent are plus 10 mesh.
Claim 5
Dependent Claim
13 words
The process as claimed in claim 1, wherein said precipitant is foundry iron.
Claim 6
Dependent Claim
13 words
The process as claimed in claim 1, wherein said precipitant is perlitic steel.
Claim 7
Dependent Claim
13 words
The process as claimed in claim 1, wherein said precipitant is cast iron.
Claim 8
Dependent Claim
26 words
The process as claimed in claim 1, wherein said head solution is a copper salt solution having a pH in the range of 1.5 to 3.
Claim 9
Dependent Claim
19 words
The process as claimed in claim 1, wherein said additional precipitant is charged substantially continuously with said head solution.
Claim 10
Dependent Claim
38 words
The process as claimed in claim 1, wherein said reactor is a substantially horizontal cylindrical vessel, and said agitation is provided by rotating said vessel around its axis whereby said precipitant particles are abraded by tumbling on themselves.
Claim 11
Dependent Claim
91 words
A continuous process for the production of copper from acidic salt solutions by cementation on a metallic iron precipitant comprising: charging a rotatable reactor vessel with granulated pig iron particles including at least 50% plus 10 mesh particles; continuously feeding said salt solution to said reactor and withdrawing spent solution and precipitated copper therefrom while continuously rotating same to tumble said iron on itself; continuously maintaining the ratio of iron precipitant to copper in solution within said reactor at a level sufficient to provide a reaction index of at least 1.
Claim 12
Dependent Claim
91 words
A continuous process for the production of copper from acidic salt solutions by cementation on a metallic iron precipitant comprising: charging a rotatable reactor vessel with granulated pig iron particles including at least 50% plus 10 mesh particles; continuously feeding said salt solution to said reactor and withdrawing spent solution and precipitated copper therefrom while continuously rotating same to tumble said iron on itself; continuously maintaining the ratio of iron precipitant to copper in solution within said reactor at a level sufficient to provide a reaction index of at least 1.
Claim 13
Dependent Claim
24 words
The process as claimed in claim 10, wherein said index is maintained by substantially continuously adding fresh precipitant to said reactor with said solution.
Claim 14
Dependent Claim
23 words
The process as claimed in claim 10, wherein said solution is a copper salt solution having a pH of about 1.5 to 3.
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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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |