US4875935A
Expired / Lapsed
US
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Anionic acrylamide polymers as copper ore agglomeration aids
Assignee: Ecolab USA Inc
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Filing: 1988-11-04
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Granted: 1989-10-24
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Expires: 2008-11-04
Abstract
Abstract An improved method for extracting copper from copper minerals by heap leaching with dilute sulfuric acid which comprises agglomerating the copper mineral fines prior to their being formed into an heap with an agglomerating agent comprising an anionic acrylamide polymer which contains at least 5 mole percent of carboxylate or sulfonate groups and has a molecular weight of least 100,000.
Inventors
- 👤 Anthony E. Gross
- 👤 Jacqueline L. Bonin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:44
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; C22B1/24; C22B1/242; C22B1/244; C22B15/00; C22B15/0002; C22B15/0004; C22B15/0006; C22B15/0063; C22B15/0065; C22B15/0067; C22B15/0071; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
84 words
An improved method for extracting copper from copper minerals by heap leaching with dilute sulfuric acid which comprises agglomerating the copper minerals prior to their being formed into a heap with an agglomerating agent comprising an anionic acrylamide polymer which contains at least five mole percent of carboxylate or sulfonate groups and has a molecular weight of at least 100,000 , and then leaching copper from said copper minerals by heap leaching with dilute sulfuric acid, collecting the copper-rich leachate, and recovering copper therefrom.
Claim 2
Dependent Claim
84 words
An improved method for extracting copper from copper minerals by heap leaching with dilute sulfuric acid which comprises agglomerating the copper minerals prior to their being formed into a heap with an agglomerating agent comprising an anionic acrylamide polymer which contains at least five mole percent of carboxylate or sulfonate groups and has a molecular weight of at least 100,000 , and then leaching copper from said copper minerals by heap leaching with dilute sulfuric acid, collecting the copper-rich leachate, and recovering copper therefrom.
Claim 3
Dependent Claim
19 words
An improved method of claim 1 wherein the anionic acrylamide polymer has a molecular weight of at least 3,000,000.
Claim 4
Dependent Claim
19 words
An improved method of claim 1 wherein the anionic acrylamide polymer is an acrylic acid or methacrylic acid polymer.
Claim 5
Dependent Claim
14 words
The improved method of claim 1 wherein the anionic acrylamide polymer contains sulfonate groups.
Claim 6
Dependent Claim
16 words
The improved method of claim 4 where the anionic acrylamide polymer is acrylamide-2-acrylamido,2-methylpropane sulfonic acid copolymer.
References Cited (Backward Citations)
US28474A
Cited
US3284393A
Cited
US3418237A
Cited
US3893847A
Cited
USRE28474E
Cited
USRE28474F1
Cited
US3692673A
Cited
US4802914A
Cited
US4703092A
Cited
EP0225596A2
Cited
US4704209A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |