US3865435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stimulation of recovery from underground deposits
Assignee: Individual
•
Filing: 1973-12-06
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Granted: 1975-02-11
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Expires: 1993-12-06
Abstract
Abstract Uniform stimulating of a low permeability deposit by the use of a hydrogen peroxide solution containing a stabilizer therefor.
Inventors
- 👤 Sarvajit S Sareen
- 👤 Iii Lucien Girard
- 👤 Robert A Hard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:12
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72; C09K8/74; E; E21; E21B; E21B43/00; E21B43/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
IN A HYDROMETALLUGICAL OPERATION FOR THE IN-SITU UNDERGROUND MINING OF A LOW GRADE COPPER-CONTAINING FORMATION BY THE USE OF A COPPER LEACHING SOLUTION FOR EXTRACTING COPPER VALUES FROM SAID FORMATION, THE IMPROVEMENT WHICH COMPRISES THE STEP OF PRIOR TO CONTACTING SAID COPPER-CONTAINING FORMATION WITH SAID LEACHING SOLUTION, THE FORMATION IS CONTACTED WITH AN AQUEOUS HYDROGEN PEROXIDE SOLUTION CONTAINING A STABILIZING AGENT THEREFOR AND WHEREBY SAID AGENT REACTS WITH THE COPPER-CONTAINING FORMATION TO FORM A PRECIPITATE AND THE RESULTANT SUBSTANTIALLY UNSTABILIZED HYDROGEN PEROXIDE DECOMPOSES TO FORM A GASEOUS MEDIUM WHICH CAUSES ADDITIONAL FRACTURING OF THE FORMATION WHEREBY GREATER LEACHING EFFICIENCY AND COPPER LOADING IS ACHIEVED WITH THE SUBSEQUENT COPPER LEACHING STEP.
Claim 2
Dependent Claim
110 words
IN A HYDROMETALLUGICAL OPERATION FOR THE IN-SITU UNDERGROUND MINING OF A LOW GRADE COPPER-CONTAINING FORMATION BY THE USE OF A COPPER LEACHING SOLUTION FOR EXTRACTING COPPER VALUES FROM SAID FORMATION, THE IMPROVEMENT WHICH COMPRISES THE STEP OF PRIOR TO CONTACTING SAID COPPER-CONTAINING FORMATION WITH SAID LEACHING SOLUTION, THE FORMATION IS CONTACTED WITH AN AQUEOUS HYDROGEN PEROXIDE SOLUTION CONTAINING A STABILIZING AGENT THEREFOR AND WHEREBY SAID AGENT REACTS WITH THE COPPER-CONTAINING FORMATION TO FORM A PRECIPITATE AND THE RESULTANT SUBSTANTIALLY UNSTABILIZED HYDROGEN PEROXIDE DECOMPOSES TO FORM A GASEOUS MEDIUM WHICH CAUSES ADDITIONAL FRACTURING OF THE FORMATION WHEREBY GREATER LEACHING EFFICIENCY AND COPPER LOADING IS ACHIEVED WITH THE SUBSEQUENT COPPER LEACHING STEP.
Claim 3
Dependent Claim
47 words
The method as set forth in claim 1 wherein the concentration of the hydrogen peroxide in solution is from about 30 percent to about 98 percent, by weight, based on the total weight of said solution and the pH of said solution is less than about 6.0.
Claim 4
Dependent Claim
32 words
The method as set forth in claim 2 wherein the stabilizing agent is an organophosphorus compound which precipitates out of said solution when said compound comes into contact with the copper-containing formation.
Claim 5
Dependent Claim
16 words
The method as set forth in claim 3 wherein the copper-containing formation contains chalcopyrite and pyrite.
Claim 6
Dependent Claim
23 words
The method as set forth in claim 4 wherein the stabilizing agent is amino trimethylene phosphonic acid or a water soluble salt thereof.
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |